OpenSSH < 5.9 Multiple DoS

Medium Nessus Plugin ID 17703

Synopsis

The SSH server on the remote host has multiple denial of service vulnerabilities.

Description

According to its banner, the version of OpenSSH running on the remote host is prior to version 5.9. Such versions are affected by multiple denial of service vulnerabilities :

- A denial of service vulnerability exists in the gss-serv.c 'ssh_gssapi_parse_ename' function. A remote attacker may be able to trigger this vulnerability if gssapi-with-mic is enabled to create a denial of service condition via a large value in a certain length field.
(CVE-2011-5000)

- On FreeBSD, NetBSD, OpenBSD, and other products, a remote, authenticated attacker could exploit the remote_glob() and process_put() functions to cause a denial of service (CPU and memory consumption).
(CVE-2010-4755)

Solution

Upgrade to OpenSSH 5.9 or later.

See Also

http://cxsecurity.com/research/89

http://site.pi3.com.pl/adv/ssh_1.txt

Plugin Details

Severity: Medium

ID: 17703

File Name: openssh_59.nasl

Version: $Revision: 1.6 $

Type: remote

Published: 2011/11/18

Modified: 2014/07/23

Dependencies: 10267

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 4

Temporal Score: 3.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:ND

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: Settings/PCI_DSS

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/09/06

Vulnerability Publication Date: 2010/07/07

Reference Information

CVE: CVE-2010-4755, CVE-2011-5000

BID: 54114, 68757