OpenSSL 1.0.1 < 1.0.1c TLS/DTLS CBC Denial of Service

This script is Copyright (C) 2012-2014 Tenable Network Security, Inc.


Synopsis :

The remote host may be affected by a denial of service vulnerability.

Description :

According to its banner, the remote web server is running a version
of OpenSSL 1.0.1 earlier than 1.0.1c. As such, the OpenSSL library
itself is reportedly affected by a denial of service vulnerability.

An integer underflow error exists in the file 'ssl/d1_enc.c' in the
function 'dtls1_enc'. When in CBC mode, TLS/DTLS record length values and
explicit initialization vector length values related to TLS/DTLS
packets are not handled properly, which can lead to memory corruption and
application crashes.

See also :

http://openssl.org/news/secadv_20120510.txt
http://www.openssl.org/news/changelog.html
http://cvs.openssl.org/chngview?cn=22547
https://bugzilla.redhat.com/show_bug.cgi?id=820686

Solution :

Upgrade to OpenSSL 1.0.1c or later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: Web Servers

Nessus Plugin ID: 59078 ()

Bugtraq ID: 53476

CVE ID: CVE-2012-2333