GLSA-200609-17 : OpenSSH: Denial of Service

This script is Copyright (C) 2006-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200609-17
(OpenSSH: Denial of Service)

Tavis Ormandy of the Google Security Team discovered a Denial of
Service vulnerability in the SSH protocol version 1 CRC compensation
attack detector.

Impact :

A remote unauthenticated attacker may be able to trigger excessive CPU
usage by sending a pathological SSH message, denying service to other
legitimate users or processes.

Workaround :

The system administrator may disable SSH protocol version 1 in
/etc/ssh/sshd_config.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200609-17.xml

Solution :

All OpenSSH users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-misc/openssh-4.3_p2-r5'

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 22464 (gentoo_GLSA-200609-17.nasl)

Bugtraq ID:

CVE ID: CVE-2006-4924