- Sep 21, 2016
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Matt Caswell authored
This issue is very similar to CVE-2016-6307 described in the previous commit. The underlying defect is different but the security analysis and impacts are the same except that it impacts DTLS. A DTLS message includes 3 bytes for its length in the header for the message. This would allow for messages up to 16Mb in length. Messages of this length are excessive and OpenSSL includes a check to ensure that a peer is sending reasonably sized messages in order to avoid too much memory being consumed to service a connection. A flaw in the logic of version 1.1.0 means that memory for the message is allocated too early, prior to the excessive message length check. Due to way memory is allocated in OpenSSL this could mean an attacker could force up to 21Mb to be allocated to service a connection. This could lead to a Denial of Service through memory exhaustion. However, the excessive message length check still takes place, and this would cause the connection to immediately fail. Assuming that the application calls SSL_free() on the failed conneciton in a timely manner then the 21Mb of allocated memory will then be immediately freed again. Therefore the excessive memory allocation will be transitory in nature. This then means that there is only a security impact if: 1) The application does not call SSL_free() in a timely manner in the event that the connection fails or 2) The application is working in a constrained environment where there is very little free memory or 3) The attacker initiates multiple connection attempts such that there are multiple connections in a state where memory has been allocated for the connection; SSL_free() has not yet been called; and there is insufficient memory to service the multiple requests. Except in the instance of (1) above any Denial Of Service is likely to be transitory because as soon as the connection fails the memory is subsequently freed again in the SSL_free() call. However there is an increased risk during this period of application crashes due to the lack of memory - which would then mean a more serious Denial of Service. This issue does not affect TLS users. Issue was reported by Shi Lei (Gear Team, Qihoo 360 Inc.). CVE-2016-6308 Reviewed-by:Richard Levitte <levitte@openssl.org>
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Matt Caswell authored
A TLS message includes 3 bytes for its length in the header for the message. This would allow for messages up to 16Mb in length. Messages of this length are excessive and OpenSSL includes a check to ensure that a peer is sending reasonably sized messages in order to avoid too much memory being consumed to service a connection. A flaw in the logic of version 1.1.0 means that memory for the message is allocated too early, prior to the excessive message length check. Due to way memory is allocated in OpenSSL this could mean an attacker could force up to 21Mb to be allocated to service a connection. This could lead to a Denial of Service through memory exhaustion. However, the excessive message length check still takes place, and this would cause the connection to immediately fail. Assuming that the application calls SSL_free() on the failed conneciton in a timely manner then the 21Mb of allocated memory will then be immediately freed again. Therefore the excessive memory allocation will be transitory in nature. This then means that there is only a security impact if: 1) The application does not call SSL_free() in a timely manner in the event that the connection fails or 2) The application is working in a constrained environment where there is very little free memory or 3) The attacker initiates multiple connection attempts such that there are multiple connections in a state where memory has been allocated for the connection; SSL_free() has not yet been called; and there is insufficient memory to service the multiple requests. Except in the instance of (1) above any Denial Of Service is likely to be transitory because as soon as the connection fails the memory is subsequently freed again in the SSL_free() call. However there is an increased risk during this period of application crashes due to the lack of memory - which would then mean a more serious Denial of Service. This issue does not affect DTLS users. Issue was reported by Shi Lei (Gear Team, Qihoo 360 Inc.). CVE-2016-6307 Reviewed-by: -
Matt Caswell authored
If OPENSSL_sk_insert() calls OPENSSL_realloc() and it fails, it was leaking the originally allocated memory. Reviewed-by:Rich Salz <rsalz@openssl.org>
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Matt Caswell authored
Certain warning alerts are ignored if they are received. This can mean that no progress will be made if one peer continually sends those warning alerts. Implement a count so that we abort the connection if we receive too many. Issue reported by Shi Lei. Reviewed-by: -
Andy Polyakov authored
Suggested in GH#1589. Reviewed-by: -
Andy Polyakov authored
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Andy Polyakov authored
Reported in GH#1589, but solution is different from suggested. Reviewed-by: -
Rich Salz authored
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Rich Salz authored
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Rich Salz authored
This reverts commit 81f9ce1e . Reviewed-by:
Matt Caswell <matt@openssl.org>
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Richard Levitte authored
There are cases when argc is more trustable than proper argv termination. Since we trust argc in all other test programs, we might as well treat it the same way in this program. Reviewed-by: -
Matt Caswell authored
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Matt Caswell authored
We should check the last BN_CTX_get() call to ensure that it isn't NULL before we try and use any of the allocated BIGNUMs. Issue reported by Shi Lei. Reviewed-by: -
Richard Levitte authored
This is a program for VMS that corresponds to util/shlib_wrap.sh. Reviewed-by: -
Richard Levitte authored
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- Sep 20, 2016
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Richard Levitte authored
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Richard Levitte authored
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Rich Salz authored
Check arg count and print an error message. Reviewed-by: -
Richard Levitte authored
Reviewed-by:Tim Hudson <tjh@openssl.org>
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Richard Levitte authored
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Richard Levitte authored
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Richard Levitte authored
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Richard Levitte authored
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Richard Levitte authored
Call SSL_CTX_new() before doing any configuration. (or call OPENSSL_ssl_init()) Reviewed-by: -
Richard Levitte authored
'ECDHParameters = Automatic' isn't accepted. Reviewed-by: -
Richard Levitte authored
Note: server-cmod doesn't seem to do things right... from loading cmod.cnf, it tries to load libssl_conf.so. Reviewed-by: -
Matt Caswell authored
All the other functions that take an argument for the number of bytes use convenience macros for this purpose. We should do the same with WPACKET_put_bytes(). Reviewed-by: -
Matt Caswell authored
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Matt Caswell authored
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Matt Caswell authored
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Matt Caswell authored
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Matt Caswell authored
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Matt Caswell authored
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FdaSilvaYY authored
CMS_NOOLDMIMETYPE and PKCS7_NOOLDMIMETYPE are unused in pkcs7/cms code. Reviewed-by:
Andy Polyakov <appro@openssl.org> Reviewed-by:
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FdaSilvaYY authored
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- Sep 19, 2016
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Matt Caswell authored
We were casting num_alloc to size_t in lots of places, or just using it in a context where size_t makes more sense - so convert it. This simplifies the code a bit. Also tweak the style in stack.c a bit following on from the previous commit Reviewed-by: -
Guido Vranken authored
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FdaSilvaYY authored
no-rsa is no longer an option since 7ec8de16 Fix a typo about poly1305 Reviewed-by:
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Richard Levitte authored
Some compilers complain about unused variables, and some tests do not run well without OCSP. Reviewed-by:
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- Sep 18, 2016
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FdaSilvaYY authored
Reviewed-by:
Viktor Dukhovni <viktor@openssl.org> Reviewed-by:
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