From: Dr. Stephen Henson <steve@openssl.org>
Date: Thu, 24 Jul 2014 23:50:06 +0000 (+0100)
Subject: Fix SRP ciphersuite DoS vulnerability.
X-Git-Tag: master-post-reformat~541
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=80bd7b41b30af6ee96f519e629463583318de3b0;p=oweals%2Fopenssl.git

Fix SRP ciphersuite DoS vulnerability.

If a client attempted to use an SRP ciphersuite and it had not been
set up correctly it would crash with a null pointer read. A malicious
server could exploit this in a DoS attack.

Thanks to Joonas Kuorilehto and Riku Hietamäki from Codenomicon
for reporting this issue.

CVE-2014-2970
Reviewed-by: Tim Hudson <tjh@openssl.org>
---

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 749d88d1a9..3616c0a11e 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1088,6 +1088,13 @@ void ssl_set_client_disabled(SSL *s)
 		c->mask_k |= SSL_kPSK;
 		}
 #endif /* OPENSSL_NO_PSK */
+#ifndef OPENSSL_NO_SRP
+	if (!(s->srp_ctx.srp_Mask & SSL_kSRP))
+		{
+		c->mask_a |= SSL_aSRP;
+		c->mask_k |= SSL_kSRP;
+		}
+#endif
 	c->valid = 1;
 	}