FreeBSD : libssh -- NULL pointer dereference (0b040e24-f751-11e4-b24d-5453ed2e2b49)

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

Andreas Schneider reports :

libssh versions 0.5.1 and above have a logical error in the handling
of a SSH_MSG_NEWKEYS and SSH_MSG_KEXDH_REPLY package. A detected error
did not set the session into the error state correctly and further
processed the packet which leads to a NULL pointer dereference. This
is the packet after the initial key exchange and doesn't require
authentication.

This could be used for a Denial of Service (DoS) attack.

See also :

http://www.nessus.org/u?ad48287a
http://www.nessus.org/u?ac89b366

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 83328 ()

Bugtraq ID:

CVE ID: CVE-2015-3146

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