FreeBSD : OpenSSH -- Memory corruption in sshd (5709d244-4873-11e3-8a46-000d601460a4)

This script is Copyright (C) 2013 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

The OpenSSH development team reports :

A memory corruption vulnerability exists in the post- authentication
sshd process when an AES-GCM cipher ([email protected] or
[email protected]) is selected during kex exchange.

If exploited, this vulnerability might permit code execution with the
privileges of the authenticated user and may therefore allow bypassing
restricted shell/command configurations.

Either upgrade to 6.4 or disable AES-GCM in the server configuration.
The following sshd_config option will disable AES-GCM while leaving
other ciphers active :

Ciphers
aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast
128-cbc,aes192-cbc,aes256-cbc

See also :

http://www.openssh.com/txt/gcmrekey.adv
http://www.nessus.org/u?43cb46ec

Solution :

Update the affected packages.

Risk factor :

High

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 70795 ()

Bugtraq ID:

CVE ID:

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