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Fix seg fault with 0 p val in SKE

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If a client receives a ServerKeyExchange for an anon DH ciphersuite with the
value of p set to 0 then a seg fault can occur. This commits adds a test to
reject p, g and pub key parameters that have a 0 value (in accordance with
RFC 5246)

The security vulnerability only affects master and 1.0.2, but the fix is
additionally applied to 1.0.1 for additional confidence.

CVE-2015-1794

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
This commit is contained in:
Guy Leaver (guleaver)
2015-08-07 15:45:21 +01:00
committed by Matt Caswell
parent 5d786e9e2d
commit ada57746b6
3 changed files with 22 additions and 0 deletions
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3
ssl/ssl.h
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@@ -2846,8 +2846,11 @@ void ERR_load_SSL_strings(void);
# define SSL_R_BAD_DATA_RETURNED_BY_CALLBACK 106
# define SSL_R_BAD_DECOMPRESSION 107
# define SSL_R_BAD_DH_G_LENGTH 108
# define SSL_R_BAD_DH_G_VALUE 375
# define SSL_R_BAD_DH_PUB_KEY_LENGTH 109
# define SSL_R_BAD_DH_PUB_KEY_VALUE 393
# define SSL_R_BAD_DH_P_LENGTH 110
# define SSL_R_BAD_DH_P_VALUE 395
# define SSL_R_BAD_DIGEST_LENGTH 111
# define SSL_R_BAD_DSA_SIGNATURE 112
# define SSL_R_BAD_ECC_CERT 304