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 prior to 4.7 is affected by an authentication bypass vulnerability. In the event that OpenSSH cannot create an untrusted cookie for X, for example due to the temporary partition being full, it will use a trusted cookie instead. This allows attackers to violate intended policy and gain privileges by causing their X client to be treated as trusted.


Upgrade to version 4.7 or higher.

See Also

Plugin Details

Severity: High

ID: 4209

Family: SSH

Published: 9/11/2007

Updated: 3/6/2019

Nessus ID: 44078

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


Risk Factor: High

Base Score: 7.3

Temporal Score: 6.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

Patch Publication Date: 9/5/2007

Vulnerability Publication Date: 9/5/2007

Reference Information

CVE: CVE-2007-4752, CVE-2007-2243

BID: 25628

IAVT: 2008-T-0046