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Last updated: 9/23/2014 10:23:26 PM

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Vulnerability Summary for CVE-2011-2895

Original release date: 08/19/2011
Last revised: 12/18/2012
Source: US-CERT/NIST

Overview

The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress.c in 4.3BSD, as used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD 4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1, FreeType 2.1.9, and other products, does not properly handle code words that are absent from the decompression table when encountered, which allows context-dependent attackers to trigger an infinite loop or a heap-based buffer overflow, and possibly execute arbitrary code, via a crafted compressed stream, a related issue to CVE-2006-1168 and CVE-2011-2896.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 9.3 (HIGH) (AV:N/AC:M/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore: 10.0
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

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External Source: SECUNIA
Name: 48951
External Source: UBUNTU
Name: USN-1191-1
External Source: SECTRACK
Name: 1025920
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=727624
External Source: MLIST
Name: [xorg-announce] 20110810 X.Org security advisory: libXfont LZW decompression heap corruption
Type: Patch Information
External Source: REDHAT
Name: RHSA-2011:1154
Type: Advisory
External Source: CONFIRM
Name: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/compress/zopen.c#rev1.17
External Source: DEBIAN
Name: DSA-2293
External Source: SECUNIA
Name: 45986
External Source: APPLE
Name: APPLE-SA-2012-02-01-1
External Source: SECUNIA
Name: 45544
Type: Advisory
External Source: REDHAT
Name: RHSA-2011:1834
External Source: BID
Name: 49124
External Source: CONFIRM
Name: http://support.apple.com/kb/HT5130
External Source: APPLE
Name: APPLE-SA-2012-05-09-1
External Source: MLIST
Name: [xorg-announce] 20110810 [ANNOUNCE] libXfont 1.4.4
Type: Patch Information
External Source: MANDRIVA
Name: MDVSA-2011:153
External Source: SUSE
Name: SUSE-SU-2011:1035
External Source: SECUNIA
Name: 46127
External Source: REDHAT
Name: RHSA-2011:1161
Type: Advisory
External Source: REDHAT
Name: RHSA-2011:1155
Type: Advisory
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=725760
Type: Patch Information
External Source: SECUNIA
Name: 45568
Type: Advisory
External Source: MLIST
Name: [oss-security] 20110810 LZW decompression issues
External Source: CONFIRM
Name: http://support.apple.com/kb/HT5281
External Source: CONFIRM
Name: http://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d11ee5886e9d9ec610051a206b135a4cdc1e09a0
Type: Patch Information
External Source: SUSE
Name: openSUSE-SU-2011:1299
External Source: SECUNIA
Name: 45599
Type: Advisory
External Source: NETBSD
Name: NetBSD-SA2011-007
External Source: XF
Name: xorg-lzw-bo(69141)

Technical Details

Vulnerability Type (View All)