OpenSSH < 4.7 Trusted X11 Cookie Connection Policy Bypass

High Nessus Network Monitor Plugin ID 4209


The remote host is vulnerable to a local 'privilege escalation' flaw.


The remote host is running a version of OpenSSH that is vulnerable to a flaw in the way that it handles local X11 cookies. It is alleged that an attacker exploiting this flaw would be able to execute SSH commands for which they are not authorized.

Note: PVS has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.


Upgrade to version 4.7 or higher.

See Also

Plugin Details

Severity: High

ID: 4209

Family: SSH

Published: 2007/09/11

Modified: 2016/11/23

Dependencies: 1997, 3059

Risk Information

Risk Factor: High


Base Score: 7.5

Temporal Score: 6.2

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

Temporal Vector: CVSS2#E:F/RL:OF/RC:C


Base Score: 7.3

Temporal Score: 6.8


Temporal Vector: CVSS3#E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Reference Information

CVE: CVE-2007-4752

BID: 25628

IAVT: 2008-T-0046