GLSA-200801-09 : X.Org X server and Xfont library: Multiple vulnerabilities

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Synopsis :

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

Description :

The remote host is affected by the vulnerability described in GLSA-200801-09
(X.Org X server and Xfont library: Multiple vulnerabilities)

regenrecht reported multiple vulnerabilities in various X server
extension via iDefense:
The XFree86-Misc extension does not properly sanitize a parameter
within a PassMessage request, allowing the modification of a function
pointer (CVE-2007-5760).
Multiple functions in the XInput extension do not properly sanitize
client requests for swapping bytes, leading to corruption of heap
memory (CVE-2007-6427).
Integer overflow vulnerabilities in the EVI extension and in the
MIT-SHM extension can lead to buffer overflows (CVE-2007-6429).
The TOG-CUP extension does not sanitize an index value in the
ProcGetReservedColormapEntries() function, leading to arbitrary memory
access (CVE-2007-6428).
A buffer overflow was discovered in the Xfont library when
processing PCF font files (CVE-2008-0006).
The X server does not enforce restrictions when a user specifies a
security policy file and attempts to open it (CVE-2007-5958).

Impact :

Remote attackers could exploit the vulnerability in the Xfont library
by enticing a user to load a specially crafted PCF font file resulting
in the execution of arbitrary code with the privileges of the user
running the X server, typically root. Local attackers could exploit
this and the vulnerabilities in the extensions to gain elevated
privileges. If the X server allows connections from the network, these
vulnerabilities could be exploited remotely. A local attacker could
determine the existence of arbitrary files by exploiting the last
vulnerability or possibly cause a Denial of Service.

Workaround :

Workarounds for some of the vulnerabilities can be found in the X.Org
security advisory as listed under References.

See also :

Solution :

All X.Org X server users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=x11-base/xorg-server-'
All X.Org Xfont library users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=x11-libs/libXfont-1.3.1-r1'

Risk factor :

High / CVSS Base Score : 9.3
CVSS Temporal Score : 8.1
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 30033 (gentoo_GLSA-200801-09.nasl)

Bugtraq ID: 27350

CVE ID: CVE-2007-5760

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