OpenSSH X11 forwarding information disclosure
| openssh-x11forwarding-info-disclosure (43940) |  Low Risk |
Description:
OpenSSH could allow a local attacker to obtain sensitive information, caused by an error when binding to previously bound ports that have the SO_REUSEADDR option enabled and the sshd_config X11UseLocalhost option set to no. An attacker could exploit this vulnerability via man-in-the-middle techniques to obtain sensitive information on systems where effective user-id or overlapping bind address checks are not present.
Platforms Affected:
- OpenBSD, OpenSSH 1
- OpenBSD, OpenSSH 1.2
- OpenBSD, OpenSSH 1.2.1
- OpenBSD, OpenSSH 1.2.2
- OpenBSD, OpenSSH 1.2.27
- OpenBSD, OpenSSH 1.2.3
- OpenBSD, OpenSSH 1.3
- OpenBSD, OpenSSH 1.5
- OpenBSD, OpenSSH 1.5.7
- OpenBSD, OpenSSH 1.5.8
- OpenBSD, OpenSSH 2
- OpenBSD, OpenSSH 2.1
- OpenBSD, OpenSSH 2.1.1
- OpenBSD, OpenSSH 2.2
- OpenBSD, OpenSSH 2.2.0
- OpenBSD, OpenSSH 2.3
- OpenBSD, OpenSSH 2.3.0
- OpenBSD, OpenSSH 2.3.1
- OpenBSD, OpenSSH 2.5
- OpenBSD, OpenSSH 2.5.1
- OpenBSD, OpenSSH 2.5.2
- OpenBSD, OpenSSH 2.9
- OpenBSD, OpenSSH 2.9.9
- OpenBSD, OpenSSH 2.9.9p2
- OpenBSD, OpenSSH 2.9p1
- OpenBSD, OpenSSH 2.9p2
- OpenBSD, OpenSSH 3.0
- OpenBSD, OpenSSH 3.0.1
- OpenBSD, OpenSSH 3.0.1p1
- OpenBSD, OpenSSH 3.0.2
- OpenBSD, OpenSSH 3.0.2p1
- OpenBSD, OpenSSH 3.0p1
- OpenBSD, OpenSSH 3.1
- OpenBSD, OpenSSH 3.1p1
- OpenBSD, OpenSSH 3.2
- OpenBSD, OpenSSH 3.2.1
- OpenBSD, OpenSSH 3.2.2
- OpenBSD, OpenSSH 3.2.2p1
- OpenBSD, OpenSSH 3.2.3p1
- OpenBSD, OpenSSH 3.3
- OpenBSD, OpenSSH 3.3p1
- OpenBSD, OpenSSH 3.4
- OpenBSD, OpenSSH 3.4p1
- OpenBSD, OpenSSH 3.5
- OpenBSD, OpenSSH 3.5p1
- OpenBSD, OpenSSH 3.6
- OpenBSD, OpenSSH 3.6.1
- OpenBSD, OpenSSH 3.6.1p1
- OpenBSD, OpenSSH 3.6.1p2
- OpenBSD, OpenSSH 3.7
- OpenBSD, OpenSSH 3.7.1
- OpenBSD, OpenSSH 3.7.1p1
- OpenBSD, OpenSSH 3.7.1p2
- OpenBSD, OpenSSH 3.8
- OpenBSD, OpenSSH 3.8.1
- OpenBSD, OpenSSH 3.8.1p1
- OpenBSD, OpenSSH 3.9
- OpenBSD, OpenSSH 3.9.1
- OpenBSD, OpenSSH 3.9.1p1
- OpenBSD, OpenSSH 4
- OpenBSD, OpenSSH 4.0
- OpenBSD, OpenSSH 4.0p1
- OpenBSD, OpenSSH 4.1
- OpenBSD, OpenSSH 4.1p1
- OpenBSD, OpenSSH 4.2
- OpenBSD, OpenSSH 4.2p1
- OpenBSD, OpenSSH 4.3
- OpenBSD, OpenSSH 4.3p1
- OpenBSD, OpenSSH 4.3p2
- OpenBSD, OpenSSH 4.4
- OpenBSD, OpenSSH 4.5
- OpenBSD, OpenSSH 4.6
- OpenBSD, OpenSSH 4.7
- OpenBSD, OpenSSH 4.8
- OpenBSD, OpenSSH 4.9
- OpenBSD, OpenSSH 5.0
Remedy:
Upgrade to the latest version of OpenSSH (5.1 or later), available from the OpenSSH Web site. See References.
Consequences:
Obtain Information
References:
- OpenSSH Changelog, Release 5.1, Changes since OpenSSH 5.0 at http://www.openssh.com/txt/release-5.1.
- OpenSSH Web site, OpenSSH Security at http://openssh.com/security.html.
- OpenSSH Web site, OpenSSH at http://openssh.com/.
- BID-30339: OpenSSH 'X11UseLocalhost' X11 Forwarding Session Hijacking Vulnerability
- CVE-2008-3259: OpenSSH before 5.1 sets the SO_REUSEADDR socket option when the X11UseLocalhost configuration setting is disabled, which allows local users on some platforms to hijack the X11 forwarding port via a bind to a single IP address, as demonstrated on the HP-UX platform.
- SA31179: OpenSSH "X11UseLocalhost" X11 Forwarding Security Issue
- SECTRACK ID: 1020537: OpenSSH on HP-UX Lets Local Users Hijack X11 Sessions
- VUPEN/ADV-2008-2148: OpenSSH X11UseLocalhost X11 Forwarding Session Hijacking Issue
Reported:
Jul 21, 2008
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