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    • Dr. Stephen Henson's avatar
      ECDH downgrade bug fix. · e42a2aba
      Dr. Stephen Henson authored
      
      
      Fix bug where an OpenSSL client would accept a handshake using an
      ephemeral ECDH ciphersuites with the server key exchange message omitted.
      
      Thanks to Karthikeyan Bhargavan for reporting this issue.
      
      CVE-2014-3572
      Reviewed-by: default avatarMatt Caswell <matt@openssl.org>
      
      (cherry picked from commit b15f8769)
      
      Conflicts:
      	CHANGES
      	ssl/s3_clnt.c
      e42a2aba
    • Dr. Stephen Henson's avatar
      Fix various certificate fingerprint issues. · ec2fede9
      Dr. Stephen Henson authored
      
      
      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.
      
      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).
      
      CVE-2014-8275
      Reviewed-by: default avatarEmilia Käsper <emilia@openssl.org>
      
      (cherry picked from commit 208a6012)
      
      Conflicts:
      	crypto/dsa/dsa_vrf.c
      ec2fede9