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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_err.c
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@@ -386,8 +386,11 @@ static ERR_STRING_DATA SSL_str_reasons[] = {
"bad data returned by callback"},
{ERR_REASON(SSL_R_BAD_DECOMPRESSION), "bad decompression"},
{ERR_REASON(SSL_R_BAD_DH_G_LENGTH), "bad dh g length"},
{ERR_REASON(SSL_R_BAD_DH_G_VALUE), "bad dh g value"},
{ERR_REASON(SSL_R_BAD_DH_PUB_KEY_LENGTH), "bad dh pub key length"},
{ERR_REASON(SSL_R_BAD_DH_PUB_KEY_VALUE), "bad dh pub key value"},
{ERR_REASON(SSL_R_BAD_DH_P_LENGTH), "bad dh p length"},
{ERR_REASON(SSL_R_BAD_DH_P_VALUE), "bad dh p value"},
{ERR_REASON(SSL_R_BAD_DIGEST_LENGTH), "bad digest length"},
{ERR_REASON(SSL_R_BAD_DSA_SIGNATURE), "bad dsa signature"},
{ERR_REASON(SSL_R_BAD_ECC_CERT), "bad ecc cert"},