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TITLE:
OpenSSH "X11UseLocalhost" X11 Forwarding Security Issue

SECUNIA ADVISORY ID:
SA31179

VERIFY ADVISORY:
http://secunia.com/advisories/31179/

CRITICAL:
Not critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

SOFTWARE:
OpenSSH 4.x
http://secunia.com/product/5653/
OpenSSH 5.x
http://secunia.com/product/19347/

DESCRIPTION:
A security issue has been reported in OpenSSH, which can be exploited
by malicious, local users to disclose sensitive information.

The security issue is caused due to the sshd server setting the
SO_REUSEADDR option for the listening socket used by the X11
forwarding server. This can be exploited to intercept an X11
forwarding session by binding a socket to the X11 forwarding port.

Successful exploitation requires that "X11UseLocalhost" is disabled
(enabled by default) and that the underlying operating system allows
the re-binding of a port without checking the effective user id or
the overlapping of addresses (e.g. HP/UX).

The security issue is reported in versions prior to 5.1.

SOLUTION:
Update to version 5.1 or 5.1p1.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits sway2004009.

ORIGINAL ADVISORY:
http://www.openssh.com/txt/release-5.1

http://openssh.com/security.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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