CHANGES

 OpenSSL CHANGES
 _______________

 Changes between 1.0.1p and 1.0.1q [xx XXX xxxx]

  *)

 Changes between 1.0.1o and 1.0.1p [9 Jul 2015]

  *) Alternate chains certificate forgery

     During certificate verfification, OpenSSL will attempt to find an
     alternative certificate chain if the first attempt to build such a chain
     fails. An error in the implementation of this logic can mean that an
     attacker could cause certain checks on untrusted certificates to be
     bypassed, such as the CA flag, enabling them to use a valid leaf
     certificate to act as a CA and "issue" an invalid certificate.

     This issue was reported to OpenSSL by Adam Langley/David Benjamin
     (Google/BoringSSL).
     [Matt Caswell]

 Changes between 1.0.1n and 1.0.1o [12 Jun 2015]

  *) Fix HMAC ABI incompatibility. The previous version introduced an ABI
     incompatibility in the handling of HMAC. The previous ABI has now been
     restored.

 Changes between 1.0.1m and 1.0.1n [11 Jun 2015]

  *) Malformed ECParameters causes infinite loop

     When processing an ECParameters structure OpenSSL enters an infinite loop
     if the curve specified is over a specially malformed binary polynomial
     field.

     This can be used to perform denial of service against any
     system which processes public keys, certificate requests or
     certificates.  This includes TLS clients and TLS servers with
     client authentication enabled.

     This issue was reported to OpenSSL by Joseph Barr-Pixton.
     (CVE-2015-1788)
     [Andy Polyakov]

  *) Exploitable out-of-bounds read in X509_cmp_time

     X509_cmp_time does not properly check the length of the ASN1_TIME
     string and can read a few bytes out of bounds. In addition,
     X509_cmp_time accepts an arbitrary number of fractional seconds in the
     time string.

     An attacker can use this to craft malformed certificates and CRLs of
     various sizes and potentially cause a segmentation fault, resulting in
     a DoS on applications that verify certificates or CRLs. TLS clients
     that verify CRLs are affected. TLS clients and servers with client
     authentication enabled may be affected if they use custom verification
     callbacks.

     This issue was reported to OpenSSL by Robert Swiecki (Google), and
     independently by Hanno Böck.
     (CVE-2015-1789)
     [Emilia Käsper]

  *) PKCS7 crash with missing EnvelopedContent

     The PKCS#7 parsing code does not handle missing inner EncryptedContent
     correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs
     with missing content and trigger a NULL pointer dereference on parsing.

     Applications that decrypt PKCS#7 data or otherwise parse PKCS#7
     structures from untrusted sources are affected. OpenSSL clients and
     servers are not affected.

     This issue was reported to OpenSSL by Michal Zalewski (Google).
     (CVE-2015-1790)
     [Emilia Käsper]

  *) CMS verify infinite loop with unknown hash function

     When verifying a signedData message the CMS code can enter an infinite loop
     if presented with an unknown hash function OID. This can be used to perform
     denial of service against any system which verifies signedData messages using
     the CMS code.
     This issue was reported to OpenSSL by Johannes Bauer.
     (CVE-2015-1792)
     [Stephen Henson]

  *) Race condition handling NewSessionTicket

     If a NewSessionTicket is received by a multi-threaded client when attempting to
     reuse a previous ticket then a race condition can occur potentially leading to
     a double free of the ticket data.
     (CVE-2015-1791)
     [Matt Caswell]

  *) Reject DH handshakes with parameters shorter than 768 bits.
     [Kurt Roeckx and Emilia Kasper]

 Changes between 1.0.1l and 1.0.1m [19 Mar 2015]

  *) Segmentation fault in ASN1_TYPE_cmp fix

     The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is
     made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check
     certificate signature algorithm consistency this can be used to crash any
     certificate verification operation and exploited in a DoS attack. Any
     application which performs certificate verification is vulnerable including
     OpenSSL clients and servers which enable client authentication.
     (CVE-2015-0286)
     [Stephen Henson]

  *) ASN.1 structure reuse memory corruption fix

     Reusing a structure in ASN.1 parsing may allow an attacker to cause
     memory corruption via an invalid write. Such reuse is and has been
     strongly discouraged and is believed to be rare.

     Applications that parse structures containing CHOICE or ANY DEFINED BY
     components may be affected. Certificate parsing (d2i_X509 and related
     functions) are however not affected. OpenSSL clients and servers are
     not affected.
     (CVE-2015-0287)
     [Stephen Henson]

  *) PKCS7 NULL pointer dereferences fix

     The PKCS#7 parsing code does not handle missing outer ContentInfo
     correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with
     missing content and trigger a NULL pointer dereference on parsing.

     Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or
     otherwise parse PKCS#7 structures from untrusted sources are
     affected. OpenSSL clients and servers are not affected.

     This issue was reported to OpenSSL by Michal Zalewski (Google).
     (CVE-2015-0289)
     [Emilia Käsper]

  *) DoS via reachable assert in SSLv2 servers fix

     A malicious client can trigger an OPENSSL_assert (i.e., an abort) in
     servers that both support SSLv2 and enable export cipher suites by sending
     a specially crafted SSLv2 CLIENT-MASTER-KEY message.

     This issue was discovered by Sean Burford (Google) and Emilia Käsper
     (OpenSSL development team).
     (CVE-2015-0293)
     [Emilia Käsper]

  *) Use After Free following d2i_ECPrivatekey error fix

     A malformed EC private key file consumed via the d2i_ECPrivateKey function
     could cause a use after free condition. This, in turn, could cause a double
     free in several private key parsing functions (such as d2i_PrivateKey
     or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption
     for applications that receive EC private keys from untrusted
     sources. This scenario is considered rare.

     This issue was discovered by the BoringSSL project and fixed in their
     commit 517073cd4b.
     (CVE-2015-0209)
     [Matt Caswell]

  *) X509_to_X509_REQ NULL pointer deref fix

     The function X509_to_X509_REQ will crash with a NULL pointer dereference if
     the certificate key is invalid. This function is rarely used in practice.

     This issue was discovered by Brian Carpenter.
     (CVE-2015-0288)
     [Stephen Henson]

  *) Removed the export ciphers from the DEFAULT ciphers
     [Kurt Roeckx]

 Changes between 1.0.1k and 1.0.1l [15 Jan 2015]

  *) Build fixes for the Windows and OpenVMS platforms
     [Matt Caswell and Richard Levitte]

 Changes between 1.0.1j and 1.0.1k [8 Jan 2015]

  *) Fix DTLS segmentation fault in dtls1_get_record. A carefully crafted DTLS
     message can cause a segmentation fault in OpenSSL due to a NULL pointer
     dereference. This could lead to a Denial Of Service attack. Thanks to
     Markus Stenberg of Cisco Systems, Inc. for reporting this issue.
     (CVE-2014-3571)
     [Steve Henson]

  *) Fix DTLS memory leak in dtls1_buffer_record. A memory leak can occur in the
     dtls1_buffer_record function under certain conditions. In particular this
     could occur if an attacker sent repeated DTLS records with the same
     sequence number but for the next epoch. The memory leak could be exploited
     by an attacker in a Denial of Service attack through memory exhaustion.
     Thanks to Chris Mueller for reporting this issue.
     (CVE-2015-0206)
     [Matt Caswell]

  *) Fix issue where no-ssl3 configuration sets method to NULL. When openssl is
     built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl
     method would be set to NULL which could later result in a NULL pointer
     dereference. Thanks to Frank Schmirler for reporting this issue.
     (CVE-2014-3569)
     [Kurt Roeckx]

  *) Abort handshake if server key exchange message is omitted for ephemeral
     ECDH ciphersuites.

     Thanks to Karthikeyan Bhargavan of the PROSECCO team at INRIA for
     reporting this issue.
     (CVE-2014-3572)
     [Steve Henson]

  *) Remove non-export ephemeral RSA code on client and server. This code
     violated the TLS standard by allowing the use of temporary RSA keys in
     non-export ciphersuites and could be used by a server to effectively
     downgrade the RSA key length used to a value smaller than the server
     certificate. Thanks for Karthikeyan Bhargavan of the PROSECCO team at
     INRIA or reporting this issue.
     (CVE-2015-0204)
     [Steve Henson]

  *) Fixed issue where DH client certificates are accepted without verification.
     An OpenSSL server will accept a DH certificate for client authentication
     without the certificate verify message. This effectively allows a client to
     authenticate without the use of a private key. This only affects servers
     which trust a client certificate authority which issues certificates
     containing DH keys: these are extremely rare and hardly ever encountered.
     Thanks for Karthikeyan Bhargavan of the PROSECCO team at INRIA or reporting
     this issue.
     (CVE-2015-0205)
     [Steve Henson]

  *) Ensure that the session ID context of an SSL is updated when its
     SSL_CTX is updated via SSL_set_SSL_CTX.

     The session ID context is typically set from the parent SSL_CTX,
     and can vary with the CTX.
     [Adam Langley]

  *) Fix various certificate fingerprint issues.

     By using non-DER or invalid encodings outside the signed portion of a
     certificate the fingerprint can be changed without breaking the signature.
     Although no details of the signed portion of the certificate can be changed
     this can cause problems with some applications: e.g. those using the
     certificate fingerprint for blacklists.

     1. Reject signatures with non zero unused bits.

     If the BIT STRING containing the signature has non zero unused bits reject
     the signature. All current signature algorithms require zero unused bits.

     2. Check certificate algorithm consistency.

     Check the AlgorithmIdentifier inside TBS matches the one in the
     certificate signature. NB: this will result in signature failure
     errors for some broken certificates.

     Thanks to Konrad Kraszewski from Google for reporting this issue.

     3. Check DSA/ECDSA signatures use DER.

     Reencode DSA/ECDSA signatures and compare with the original received
     signature. Return an error if there is a mismatch.

     This will reject various cases including garbage after signature
     (thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
     program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
     (negative or with leading zeroes).

     Further analysis was conducted and fixes were developed by Stephen Henson
     of the OpenSSL core team.

     (CVE-2014-8275)
     [Steve Henson]

   *) Correct Bignum squaring. Bignum squaring (BN_sqr) may produce incorrect
      results on some platforms, including x86_64. This bug occurs at random
      with a very low probability, and is not known to be exploitable in any
      way, though its exact impact is difficult to determine. Thanks to Pieter
      Wuille (Blockstream) who reported this issue and also suggested an initial
      fix. Further analysis was conducted by the OpenSSL development team and
      Adam Langley of Google. The final fix was developed by Andy Polyakov of
      the OpenSSL core team.
      (CVE-2014-3570)
      [Andy Polyakov]

   *) Do not resume sessions on the server if the negotiated protocol
      version does not match the session's version. Resuming with a different
      version, while not strictly forbidden by the RFC, is of questionable
      sanity and breaks all known clients.
      [David Benjamin, Emilia Käsper]

   *) Tighten handling of the ChangeCipherSpec (CCS) message: reject
      early CCS messages during renegotiation. (Note that because
      renegotiation is encrypted, this early CCS was not exploitable.)
      [Emilia Käsper]

   *) Tighten client-side session ticket handling during renegotiation:
      ensure that the client only accepts a session ticket if the server sends
      the extension anew in the ServerHello. Previously, a TLS client would
      reuse the old extension state and thus accept a session ticket if one was
      announced in the initial ServerHello.

      Similarly, ensure that the client requires a session ticket if one
      was advertised in the ServerHello. Previously, a TLS client would
      ignore a missing NewSessionTicket message.
      [Emilia Käsper]

 Changes between 1.0.1i and 1.0.1j [15 Oct 2014]

  *) SRTP Memory Leak.

     A flaw in the DTLS SRTP extension parsing code allows an attacker, who
     sends a carefully crafted handshake message, to cause OpenSSL to fail
     to free up to 64k of memory causing a memory leak. This could be
     exploited in a Denial Of Service attack. This issue affects OpenSSL
     1.0.1 server implementations for both SSL/TLS and DTLS regardless of
     whether SRTP is used or configured. Implementations of OpenSSL that
     have been compiled with OPENSSL_NO_SRTP defined are not affected.

     The fix was developed by the OpenSSL team.
     (CVE-2014-3513)
     [OpenSSL team]

  *) Session Ticket Memory Leak.

     When an OpenSSL SSL/TLS/DTLS server receives a session ticket the
     integrity of that ticket is first verified. In the event of a session
     ticket integrity check failing, OpenSSL will fail to free memory
     causing a memory leak. By sending a large number of invalid session
     tickets an attacker could exploit this issue in a Denial Of Service
     attack.
     (CVE-2014-3567)
     [Steve Henson]

  *) Build option no-ssl3 is incomplete.

     When OpenSSL is configured with "no-ssl3" as a build option, servers
     could accept and complete a SSL 3.0 handshake, and clients could be
     configured to send them.
     (CVE-2014-3568)
     [Akamai and the OpenSSL team]

  *) Add support for TLS_FALLBACK_SCSV.
     Client applications doing fallback retries should call
     SSL_set_mode(s, SSL_MODE_SEND_FALLBACK_SCSV).
     (CVE-2014-3566)
     [Adam Langley, Bodo Moeller]

  *) Add additional DigestInfo checks.
 
     Reencode DigestInto in DER and check against the original when
     verifying RSA signature: this will reject any improperly encoded
     DigestInfo structures.

     Note: this is a precautionary measure and no attacks are currently known.

     [Steve Henson]

 Changes between 1.0.1h and 1.0.1i [6 Aug 2014]

  *) Fix SRP buffer overrun vulnerability. Invalid parameters passed to the
     SRP code can be overrun an internal buffer. Add sanity check that
     g, A, B < N to SRP code.

     Thanks to Sean Devlin and Watson Ladd of Cryptography Services, NCC
     Group for discovering this issue.
     (CVE-2014-3512)
     [Steve Henson]

  *) A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate
     TLS 1.0 instead of higher protocol versions when the ClientHello message
     is badly fragmented. This allows a man-in-the-middle attacker to force a
     downgrade to TLS 1.0 even if both the server and the client support a
     higher protocol version, by modifying the client's TLS records.

     Thanks to David Benjamin and Adam Langley (Google) for discovering and
     researching this issue.
     (CVE-2014-3511)
     [David Benjamin]

  *) OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject
     to a denial of service attack. A malicious server can crash the client
     with a null pointer dereference (read) by specifying an anonymous (EC)DH
     ciphersuite and sending carefully crafted handshake messages.

     Thanks to Felix Gröbert (Google) for discovering and researching this
     issue.
     (CVE-2014-3510)
     [Emilia Käsper]

  *) By sending carefully crafted DTLS packets an attacker could cause openssl
     to leak memory. This can be exploited through a Denial of Service attack.
     Thanks to Adam Langley for discovering and researching this issue.
     (CVE-2014-3507)
     [Adam Langley]

  *) An attacker can force openssl to consume large amounts of memory whilst
     processing DTLS handshake messages. This can be exploited through a
     Denial of Service attack.
     Thanks to Adam Langley for discovering and researching this issue.
     (CVE-2014-3506)
     [Adam Langley]

  *) An attacker can force an error condition which causes openssl to crash
     whilst processing DTLS packets due to memory being freed twice. This
     can be exploited through a Denial of Service attack.
     Thanks to Adam Langley and Wan-Teh Chang for discovering and researching
     this issue.
     (CVE-2014-3505)
     [Adam Langley]

  *) If a multithreaded client connects to a malicious server using a resumed
     session and the server sends an ec point format extension it could write
     up to 255 bytes to freed memory.

     Thanks to Gabor Tyukasz (LogMeIn Inc) for discovering and researching this
     issue.
     (CVE-2014-3509)
     [Gabor Tyukasz]

  *) A malicious server can crash an OpenSSL client with a null pointer
     dereference (read) by specifying an SRP ciphersuite even though it was not
     properly negotiated with the client. This can be exploited through a
     Denial of Service attack.

     Thanks to Joonas Kuorilehto and Riku Hietamäki (Codenomicon) for
     discovering and researching this issue.
     (CVE-2014-5139)
     [Steve Henson]

  *) A flaw in OBJ_obj2txt may cause pretty printing functions such as
     X509_name_oneline, X509_name_print_ex et al. to leak some information
     from the stack. Applications may be affected if they echo pretty printing
     output to the attacker.

     Thanks to Ivan Fratric (Google) for discovering this issue.
     (CVE-2014-3508)
     [Emilia Käsper, and Steve Henson]

  *) Fix ec_GFp_simple_points_make_affine (thus, EC_POINTs_mul etc.)
     for corner cases. (Certain input points at infinity could lead to
     bogus results, with non-infinity inputs mapped to infinity too.)
     [Bodo Moeller]

 Changes between 1.0.1g and 1.0.1h [5 Jun 2014]

  *) Fix for SSL/TLS MITM flaw. An attacker using a carefully crafted
     handshake can force the use of weak keying material in OpenSSL
     SSL/TLS clients and servers.

     Thanks to KIKUCHI Masashi (Lepidum Co. Ltd.) for discovering and
     researching this issue. (CVE-2014-0224)
     [KIKUCHI Masashi, Steve Henson]

  *) Fix DTLS recursion flaw. By sending an invalid DTLS handshake to an
     OpenSSL DTLS client the code can be made to recurse eventually crashing
     in a DoS attack.

     Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
     (CVE-2014-0221)
     [Imre Rad, Steve Henson]

  *) Fix DTLS invalid fragment vulnerability. A buffer overrun attack can
     be triggered by sending invalid DTLS fragments to an OpenSSL DTLS
     client or server. This is potentially exploitable to run arbitrary
     code on a vulnerable client or server.

     Thanks to Jüri Aedla for reporting this issue. (CVE-2014-0195)
     [Jüri Aedla, Steve Henson]

  *) Fix bug in TLS code where clients enable anonymous ECDH ciphersuites
     are subject to a denial of service attack.

     Thanks to Felix Gröbert and Ivan Fratric at Google for discovering
     this issue. (CVE-2014-3470)
     [Felix Gröbert, Ivan Fratric, Steve Henson]

  *) Harmonize version and its documentation. -f flag is used to display
     compilation flags.
     [mancha <mancha1@zoho.com>]

  *) Fix eckey_priv_encode so it immediately returns an error upon a failure
     in i2d_ECPrivateKey.
     [mancha <mancha1@zoho.com>]

  *) Fix some double frees. These are not thought to be exploitable.
     [mancha <mancha1@zoho.com>]

 Changes between 1.0.1f and 1.0.1g [7 Apr 2014]

  *) A missing bounds check in the handling of the TLS heartbeat extension
     can be used to reveal up to 64k of memory to a connected client or
     server.

     Thanks for Neel Mehta of Google Security for discovering this bug and to
     Adam Langley <agl@chromium.org> and Bodo Moeller <bmoeller@acm.org> for
     preparing the fix (CVE-2014-0160)
     [Adam Langley, Bodo Moeller]

  *) Fix for the attack described in the paper "Recovering OpenSSL
     ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack"
     by Yuval Yarom and Naomi Benger. Details can be obtained from:
     http://eprint.iacr.org/2014/140

     Thanks to Yuval Yarom and Naomi Benger for discovering this
     flaw and to Yuval Yarom for supplying a fix (CVE-2014-0076)
     [Yuval Yarom and Naomi Benger]

  *) TLS pad extension: draft-agl-tls-padding-03

     Workaround for the "TLS hang bug" (see FAQ and PR#2771): if the
     TLS client Hello record length value would otherwise be > 255 and
     less that 512 pad with a dummy extension containing zeroes so it
     is at least 512 bytes long.

     [Adam Langley, Steve Henson]

 Changes between 1.0.1e and 1.0.1f [6 Jan 2014]

  *) Fix for TLS record tampering bug. A carefully crafted invalid 
     handshake could crash OpenSSL with a NULL pointer exception.
     Thanks to Anton Johansson for reporting this issues.
     (CVE-2013-4353)

  *) Keep original DTLS digest and encryption contexts in retransmission
     structures so we can use the previous session parameters if they need
     to be resent. (CVE-2013-6450)
     [Steve Henson]

  *) Add option SSL_OP_SAFARI_ECDHE_ECDSA_BUG (part of SSL_OP_ALL) which
     avoids preferring ECDHE-ECDSA ciphers when the client appears to be
     Safari on OS X.  Safari on OS X 10.8..10.8.3 advertises support for
     several ECDHE-ECDSA ciphers, but fails to negotiate them.  The bug
     is fixed in OS X 10.8.4, but Apple have ruled out both hot fixing
     10.8..10.8.3 and forcing users to upgrade to 10.8.4 or newer.
     [Rob Stradling, Adam Langley]

 Changes between 1.0.1d and 1.0.1e [11 Feb 2013]

  *) Correct fix for CVE-2013-0169. The original didn't work on AES-NI
     supporting platforms or when small records were transferred.
     [Andy Polyakov, Steve Henson]

 Changes between 1.0.1c and 1.0.1d [5 Feb 2013]

  *) Make the decoding of SSLv3, TLS and DTLS CBC records constant time.

     This addresses the flaw in CBC record processing discovered by 
     Nadhem Alfardan and Kenny Paterson. Details of this attack can be found
     at: http://www.isg.rhul.ac.uk/tls/     

     Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
     Security Group at Royal Holloway, University of London
     (www.isg.rhul.ac.uk) for discovering this flaw and Adam Langley and
     Emilia Käsper for the initial patch.
     (CVE-2013-0169)
     [Emilia Käsper, Adam Langley, Ben Laurie, Andy Polyakov, Steve Henson]

  *) Fix flaw in AESNI handling of TLS 1.2 and 1.1 records for CBC mode
     ciphersuites which can be exploited in a denial of service attack.
     Thanks go to and to Adam Langley <agl@chromium.org> for discovering
     and detecting this bug and to Wolfgang Ettlinger
     <wolfgang.ettlinger@gmail.com> for independently discovering this issue.
     (CVE-2012-2686)
     [Adam Langley]

  *) Return an error when checking OCSP signatures when key is NULL.
     This fixes a DoS attack. (CVE-2013-0166)
     [Steve Henson]

  *) Make openssl verify return errors.
     [Chris Palmer <palmer@google.com> and Ben Laurie]

  *) Call OCSP Stapling callback after ciphersuite has been chosen, so
     the right response is stapled. Also change SSL_get_certificate()
     so it returns the certificate actually sent.
     See http://rt.openssl.org/Ticket/Display.html?id=2836.
     [Rob Stradling <rob.stradling@comodo.com>]

  *) Fix possible deadlock when decoding public keys.
     [Steve Henson]

  *) Don't use TLS 1.0 record version number in initial client hello
     if renegotiating.
     [Steve Henson]

 Changes between 1.0.1b and 1.0.1c [10 May 2012]

  *) Sanity check record length before skipping explicit IV in TLS
     1.2, 1.1 and DTLS to fix DoS attack.

     Thanks to Codenomicon for discovering this issue using Fuzz-o-Matic
     fuzzing as a service testing platform.
     (CVE-2012-2333)
     [Steve Henson]

  *) Initialise tkeylen properly when encrypting CMS messages.
     Thanks to Solar Designer of Openwall for reporting this issue.
     [Steve Henson]

  *) In FIPS mode don't try to use composite ciphers as they are not
     approved.
     [Steve Henson]

 Changes between 1.0.1a and 1.0.1b [26 Apr 2012]

  *) OpenSSL 1.0.0 sets SSL_OP_ALL to 0x80000FFFL and OpenSSL 1.0.1 and
     1.0.1a set SSL_OP_NO_TLSv1_1 to 0x00000400L which would unfortunately
     mean any application compiled against OpenSSL 1.0.0 headers setting
     SSL_OP_ALL would also set SSL_OP_NO_TLSv1_1, unintentionally disablng
     TLS 1.1 also. Fix this by changing the value of SSL_OP_NO_TLSv1_1 to
     0x10000000L Any application which was previously compiled against
     OpenSSL 1.0.1 or 1.0.1a headers and which cares about SSL_OP_NO_TLSv1_1
     will need to be recompiled as a result. Letting be results in
     inability to disable specifically TLS 1.1 and in client context,
     in unlike event, limit maximum offered version to TLS 1.0 [see below].
     [Steve Henson]

  *) In order to ensure interoperabilty SSL_OP_NO_protocolX does not
     disable just protocol X, but all protocols above X *if* there are
     protocols *below* X still enabled. In more practical terms it means
     that if application wants to disable TLS1.0 in favor of TLS1.1 and
     above, it's not sufficient to pass SSL_OP_NO_TLSv1, one has to pass
     SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. This applies to
     client side.
     [Andy Polyakov]

 Changes between 1.0.1 and 1.0.1a [19 Apr 2012]

  *) Check for potentially exploitable overflows in asn1_d2i_read_bio
     BUF_mem_grow and BUF_mem_grow_clean. Refuse attempts to shrink buffer
     in CRYPTO_realloc_clean.

     Thanks to Tavis Ormandy, Google Security Team, for discovering this
     issue and to Adam Langley <agl@chromium.org> for fixing it.
     (CVE-2012-2110)
     [Adam Langley (Google), Tavis Ormandy, Google Security Team]

  *) Don't allow TLS 1.2 SHA-256 ciphersuites in TLS 1.0, 1.1 connections.
     [Adam Langley]

  *) Workarounds for some broken servers that "hang" if a client hello
     record length exceeds 255 bytes.

     1. Do not use record version number > TLS 1.0 in initial client
        hello: some (but not all) hanging servers will now work.
     2. If we set OPENSSL_MAX_TLS1_2_CIPHER_LENGTH this will truncate
	the number of ciphers sent in the client hello. This should be
        set to an even number, such as 50, for example by passing:
        -DOPENSSL_MAX_TLS1_2_CIPHER_LENGTH=50 to config or Configure.
        Most broken servers should now work.
     3. If all else fails setting OPENSSL_NO_TLS1_2_CLIENT will disable
	TLS 1.2 client support entirely.
     [Steve Henson]

  *) Fix SEGV in Vector Permutation AES module observed in OpenSSH.
     [Andy Polyakov]

 Changes between 1.0.0h and 1.0.1  [14 Mar 2012]

  *) Add compatibility with old MDC2 signatures which use an ASN1 OCTET
     STRING form instead of a DigestInfo.
     [Steve Henson]

  *) The format used for MDC2 RSA signatures is inconsistent between EVP
     and the RSA_sign/RSA_verify functions. This was made more apparent when
     OpenSSL used RSA_sign/RSA_verify for some RSA signatures in particular
     those which went through EVP_PKEY_METHOD in 1.0.0 and later. Detect 
     the correct format in RSA_verify so both forms transparently work.
     [Steve Henson]

  *) Some servers which support TLS 1.0 can choke if we initially indicate
     support for TLS 1.2 and later renegotiate using TLS 1.0 in the RSA
     encrypted premaster secret. As a workaround use the maximum pemitted
     client version in client hello, this should keep such servers happy
     and still work with previous versions of OpenSSL.
     [Steve Henson]

  *) Add support for TLS/DTLS heartbeats.
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Add support for SCTP.
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Improved PRNG seeding for VOS.
     [Paul Green <Paul.Green@stratus.com>]

  *) Extensive assembler packs updates, most notably:

	- x86[_64]:     AES-NI, PCLMULQDQ, RDRAND support;
	- x86[_64]:     SSSE3 support (SHA1, vector-permutation AES);
	- x86_64:       bit-sliced AES implementation;
	- ARM:          NEON support, contemporary platforms optimizations;
	- s390x:        z196 support;
	- *:            GHASH and GF(2^m) multiplication implementations;

     [Andy Polyakov]

  *) Make TLS-SRP code conformant with RFC 5054 API cleanup
     (removal of unnecessary code)
     [Peter Sylvester <peter.sylvester@edelweb.fr>]

  *) Add TLS key material exporter from RFC 5705.
     [Eric Rescorla]

  *) Add DTLS-SRTP negotiation from RFC 5764.
     [Eric Rescorla]

  *) Add Next Protocol Negotiation,
     http://tools.ietf.org/html/draft-agl-tls-nextprotoneg-00. Can be
     disabled with a no-npn flag to config or Configure. Code donated
     by Google.
     [Adam Langley <agl@google.com> and Ben Laurie]

  *) Add optional 64-bit optimized implementations of elliptic curves NIST-P224,
     NIST-P256, NIST-P521, with constant-time single point multiplication on
     typical inputs. Compiler support for the nonstandard type __uint128_t is
     required to use this (present in gcc 4.4 and later, for 64-bit builds).
     Code made available under Apache License version 2.0.

     Specify "enable-ec_nistp_64_gcc_128" on the Configure (or config) command
     line to include this in your build of OpenSSL, and run "make depend" (or
     "make update"). This enables the following EC_METHODs:

         EC_GFp_nistp224_method()
         EC_GFp_nistp256_method()
         EC_GFp_nistp521_method()

     EC_GROUP_new_by_curve_name() will automatically use these (while
     EC_GROUP_new_curve_GFp() currently prefers the more flexible
     implementations).
     [Emilia Käsper, Adam Langley, Bodo Moeller (Google)]

  *) Use type ossl_ssize_t instad of ssize_t which isn't available on
     all platforms. Move ssize_t definition from e_os.h to the public
     header file e_os2.h as it now appears in public header file cms.h
     [Steve Henson]

  *) New -sigopt option to the ca, req and x509 utilities. Additional
     signature parameters can be passed using this option and in
     particular PSS. 
     [Steve Henson]

  *) Add RSA PSS signing function. This will generate and set the
     appropriate AlgorithmIdentifiers for PSS based on those in the
     corresponding EVP_MD_CTX structure. No application support yet.
     [Steve Henson]

  *) Support for companion algorithm specific ASN1 signing routines.
     New function ASN1_item_sign_ctx() signs a pre-initialised
     EVP_MD_CTX structure and sets AlgorithmIdentifiers based on
     the appropriate parameters.
     [Steve Henson]

  *) Add new algorithm specific ASN1 verification initialisation function
     to EVP_PKEY_ASN1_METHOD: this is not in EVP_PKEY_METHOD since the ASN1
     handling will be the same no matter what EVP_PKEY_METHOD is used.
     Add a PSS handler to support verification of PSS signatures: checked
     against a number of sample certificates.
     [Steve Henson]

  *) Add signature printing for PSS. Add PSS OIDs.
     [Steve Henson, Martin Kaiser <lists@kaiser.cx>]

  *) Add algorithm specific signature printing. An individual ASN1 method
     can now print out signatures instead of the standard hex dump. 

     More complex signatures (e.g. PSS) can print out more meaningful
     information. Include DSA version that prints out the signature
     parameters r, s.
     [Steve Henson]

  *) Password based recipient info support for CMS library: implementing
     RFC3211.
     [Steve Henson]

  *) Split password based encryption into PBES2 and PBKDF2 functions. This
     neatly separates the code into cipher and PBE sections and is required
     for some algorithms that split PBES2 into separate pieces (such as
     password based CMS).
     [Steve Henson]

  *) Session-handling fixes:
     - Fix handling of connections that are resuming with a session ID,
       but also support Session Tickets.
     - Fix a bug that suppressed issuing of a new ticket if the client
       presented a ticket with an expired session.
     - Try to set the ticket lifetime hint to something reasonable.
     - Make tickets shorter by excluding irrelevant information.
     - On the client side, don't ignore renewed tickets.
     [Adam Langley, Bodo Moeller (Google)]

  *) Fix PSK session representation.
     [Bodo Moeller]

  *) Add RC4-MD5 and AESNI-SHA1 "stitched" implementations.

     This work was sponsored by Intel.
     [Andy Polyakov]

  *) Add GCM support to TLS library. Some custom code is needed to split
     the IV between the fixed (from PRF) and explicit (from TLS record)
     portions. This adds all GCM ciphersuites supported by RFC5288 and 
     RFC5289. Generalise some AES* cipherstrings to inlclude GCM and
     add a special AESGCM string for GCM only.
     [Steve Henson]

  *) Expand range of ctrls for AES GCM. Permit setting invocation
     field on decrypt and retrieval of invocation field only on encrypt.
     [Steve Henson]

  *) Add HMAC ECC ciphersuites from RFC5289. Include SHA384 PRF support.
     As required by RFC5289 these ciphersuites cannot be used if for
     versions of TLS earlier than 1.2.
     [Steve Henson]

  *) For FIPS capable OpenSSL interpret a NULL default public key method
     as unset and return the appopriate default but do *not* set the default.
     This means we can return the appopriate method in applications that
     swicth between FIPS and non-FIPS modes.
     [Steve Henson]

  *) Redirect HMAC and CMAC operations to FIPS module in FIPS mode. If an
     ENGINE is used then we cannot handle that in the FIPS module so we
     keep original code iff non-FIPS operations are allowed.
     [Steve Henson]

  *) Add -attime option to openssl utilities.
     [Peter Eckersley <pde@eff.org>, Ben Laurie and Steve Henson]

  *) Redirect DSA and DH operations to FIPS module in FIPS mode.
     [Steve Henson]

  *) Redirect ECDSA and ECDH operations to FIPS module in FIPS mode. Also use
     FIPS EC methods unconditionally for now.
     [Steve Henson]

  *) New build option no-ec2m to disable characteristic 2 code.
     [Steve Henson]

  *) Backport libcrypto audit of return value checking from 1.1.0-dev; not
     all cases can be covered as some introduce binary incompatibilities.
     [Steve Henson]

  *) Redirect RSA operations to FIPS module including keygen,
     encrypt, decrypt, sign and verify. Block use of non FIPS RSA methods.
     [Steve Henson]

  *) Add similar low level API blocking to ciphers.
     [Steve Henson]

  *) Low level digest APIs are not approved in FIPS mode: any attempt
     to use these will cause a fatal error. Applications that *really* want
     to use them can use the private_* version instead.
     [Steve Henson]

  *) Redirect cipher operations to FIPS module for FIPS builds. 
     [Steve Henson]

  *) Redirect digest operations to FIPS module for FIPS builds. 
     [Steve Henson]

  *) Update build system to add "fips" flag which will link in fipscanister.o
     for static and shared library builds embedding a signature if needed.
     [Steve Henson]

  *) Output TLS supported curves in preference order instead of numerical
     order. This is currently hardcoded for the highest order curves first.
     This should be configurable so applications can judge speed vs strength.
     [Steve Henson]

  *) Add TLS v1.2 server support for client authentication. 
     [Steve Henson]

  *) Add support for FIPS mode in ssl library: disable SSLv3, non-FIPS ciphers
     and enable MD5.
     [Steve Henson]

  *) Functions FIPS_mode_set() and FIPS_mode() which call the underlying
     FIPS modules versions.
     [Steve Henson]

  *) Add TLS v1.2 client side support for client authentication. Keep cache
     of handshake records longer as we don't know the hash algorithm to use
     until after the certificate request message is received.
     [Steve Henson]

  *) Initial TLS v1.2 client support. Add a default signature algorithms
     extension including all the algorithms we support. Parse new signature
     format in client key exchange. Relax some ECC signing restrictions for
     TLS v1.2 as indicated in RFC5246.
     [Steve Henson]

  *) Add server support for TLS v1.2 signature algorithms extension. Switch
     to new signature format when needed using client digest preference.
     All server ciphersuites should now work correctly in TLS v1.2. No client
     support yet and no support for client certificates.
     [Steve Henson]

  *) Initial TLS v1.2 support. Add new SHA256 digest to ssl code, switch
     to SHA256 for PRF when using TLS v1.2 and later. Add new SHA256 based
     ciphersuites. At present only RSA key exchange ciphersuites work with
     TLS v1.2. Add new option for TLS v1.2 replacing the old and obsolete
     SSL_OP_PKCS1_CHECK flags with SSL_OP_NO_TLSv1_2. New TLSv1.2 methods
     and version checking.
     [Steve Henson]

  *) New option OPENSSL_NO_SSL_INTERN. If an application can be compiled
     with this defined it will not be affected by any changes to ssl internal
     structures. Add several utility functions to allow openssl application
     to work with OPENSSL_NO_SSL_INTERN defined.
     [Steve Henson]

  *) Add SRP support.
     [Tom Wu <tjw@cs.stanford.edu> and Ben Laurie]

  *) Add functions to copy EVP_PKEY_METHOD and retrieve flags and id.
     [Steve Henson]

  *) Permit abbreviated handshakes when renegotiating using the function
     SSL_renegotiate_abbreviated().
     [Robin Seggelmann <seggelmann@fh-muenster.de>]

  *) Add call to ENGINE_register_all_complete() to
     ENGINE_load_builtin_engines(), so some implementations get used
     automatically instead of needing explicit application support.
     [Steve Henson]

  *) Add support for TLS key exporter as described in RFC5705.
     [Robin Seggelmann <seggelmann@fh-muenster.de>, Steve Henson]

  *) Initial TLSv1.1 support. Since TLSv1.1 is very similar to TLS v1.0 only
     a few changes are required:

       Add SSL_OP_NO_TLSv1_1 flag.
       Add TLSv1_1 methods.
       Update version checking logic to handle version 1.1.
       Add explicit IV handling (ported from DTLS code).
       Add command line options to s_client/s_server.
     [Steve Henson]

 Changes between 1.0.0g and 1.0.0h [12 Mar 2012]

  *) Fix MMA (Bleichenbacher's attack on PKCS #1 v1.5 RSA padding) weakness
     in CMS and PKCS7 code. When RSA decryption fails use a random key for
     content decryption and always return the same error. Note: this attack
     needs on average 2^20 messages so it only affects automated senders. The
     old behaviour can be reenabled in the CMS code by setting the
     CMS_DEBUG_DECRYPT flag: this is useful for debugging and testing where
     an MMA defence is not necessary.
     Thanks to Ivan Nestlerode <inestlerode@us.ibm.com> for discovering
     this issue. (CVE-2012-0884)
     [Steve Henson]

  *) Fix CVE-2011-4619: make sure we really are receiving a 
     client hello before rejecting multiple SGC restarts. Thanks to
     Ivan Nestlerode <inestlerode@us.ibm.com> for discovering this bug.
     [Steve Henson]

 Changes between 1.0.0f and 1.0.0g [18 Jan 2012]

  *) Fix for DTLS DoS issue introduced by fix for CVE-2011-4109.
     Thanks to Antonio Martin, Enterprise Secure Access Research and
     Development, Cisco Systems, Inc. for discovering this bug and
     preparing a fix. (CVE-2012-0050)
     [Antonio Martin]

 Changes between 1.0.0e and 1.0.0f [4 Jan 2012]

  *) Nadhem Alfardan and Kenny Paterson have discovered an extension
     of the Vaudenay padding oracle attack on CBC mode encryption
     which enables an efficient plaintext recovery attack against
     the OpenSSL implementation of DTLS. Their attack exploits timing
     differences arising during decryption processing. A research
     paper describing this attack can be found at:
                  http://www.isg.rhul.ac.uk/~kp/dtls.pdf
     Thanks go to Nadhem Alfardan and Kenny Paterson of the Information
     Security Group at Royal Holloway, University of London
     (www.isg.rhul.ac.uk) for discovering this flaw and to Robin Seggelmann
     <seggelmann@fh-muenster.de> and Michael Tuexen <tuexen@fh-muenster.de>
     for preparing the fix. (CVE-2011-4108)
     [Robin Seggelmann, Michael Tuexen]

  *) Clear bytes used for block padding of SSL 3.0 records.
     (CVE-2011-4576)
     [Adam Langley (Google)]

  *) Only allow one SGC handshake restart for SSL/TLS. Thanks to George
     Kadianakis <desnacked@gmail.com> for discovering this issue and
     Adam Langley for preparing the fix. (CVE-2011-4619)
     [Adam Langley (Google)]

  *) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
     [Andrey Kulikov <amdeich@gmail.com>]