OpenSSL 1.0.1e NULL Pointer dereference DoS

2014.01.11
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

*) Fix for TLS record tampering bug. A carefully crafted invalid handshake could crash OpenSSL with a NULL pointer exception. Thanks to Anton Johansson for reporting this issues. (CVE-2013-4353) diff --git a/ssl/s3_both.c b/ssl/s3_both.c index 1e5dcab..53b9390 100644 (file) --- a/ssl/s3_both.c +++ b/ssl/s3_both.c @@ -210,7 +210,11 @@ static void ssl3_take_mac(SSL *s) { const char *sender; int slen; - + /* If no new cipher setup return immediately: other functions will + * set the appropriate error. + */ + if (s->s3->tmp.new_cipher == NULL) + return; if (s->state & SSL_ST_CONNECT) { sender=s->method->ssl3_enc->server_finished_label;

References:

https://bugzilla.redhat.com/show_bug.cgi?id=1049058
http://www.openssl.org/news/vulnerabilities.html
http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=197e0ea817ad64820789d86711d55ff50d71f631
http://git.openssl.org/gitweb/?p=openssl.git;a=blob_plain;f=CHANGES;hb=refs/heads/OpenSSL_1_0_1-stable


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