GLSA-201110-19 : X.Org X Server: Multiple vulnerabilities

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201110-19
(X.Org X Server: Multiple vulnerabilities)

vladz reported the following vulnerabilities in the X.Org X server:
The X.Org X server follows symbolic links when trying to access the
lock file for a X display, showing a predictable behavior depending on
the file type of the link target (CVE-2011-4028).
The X.Org X server lock file mechanism allows for a race condition to
cause the X server to modify the file permissions of an arbitrary file
to 0444 (CVE-2011-4029).

Impact :

A local attacker could exploit these vulnerabilities to disclose
information by making arbitrary files on a system world-readable or gain
information whether a specified file exists on the system and whether it
is a file, directory, or a named pipe.

Workaround :

There is no known workaround at this time.

See also :

http://www.gentoo.org/security/en/glsa/glsa-201110-19.xml

Solution :

All X.Org X Server 1.9 users should upgrade to the latest 1.9 version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=x11-base/xorg-server-1.9.5-r1'
All X.Org X Server 1.10 users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=x11-base/xorg-server-1.10.4-r1'

Risk factor :

Low / CVSS Base Score : 1.9
(CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 56594 ()

Bugtraq ID:

CVE ID: CVE-2011-4028
CVE-2011-4029