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Last updated: 5/4/2015 5:04:48 AM

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Vulnerability Summary for CVE-2011-2895

Original release date: 08/19/2011
Last revised: 12/18/2012


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.


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

References to Advisories, Solutions, and Tools

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

Technical Details

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