CVE Database


Impact: Moderate
Public: 2011-08-10
Bugzilla: 727800: CVE-2011-2896 David Koblas' GIF decoder LZW decoder buffer overflow


The MITRE CVE dictionary describes this issue as:

The LZW decompressor in the LWZReadByte function in giftoppm.c in the David Koblas GIF decoder in PBMPLUS, as used in the gif_read_lzw function in filter/image-gif.c in CUPS before 1.4.7, the LZWReadByte function in plug-ins/common/file-gif-load.c in GIMP 2.6.11 and earlier, the LZWReadByte function in img/gifread.c in XPCE in SWI-Prolog 5.10.4 and earlier, and other products, does not properly handle code words that are absent from the decompression table when encountered, which allows remote 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-2011-2895.

Find out more about CVE-2011-2896 from the MITRE CVE dictionary and NIST NVD.


Vulnerable. This issue affects the versions of cups as shipped with Red Hat Enterprise Linux 4, 5, and 6. The Red Hat Security Response Team has rated this issue as having moderate security impact for the cups package. A future update may address this issue in the cups package for Red Hat Enterprise Linux 4, 5, and 6. For additional information, refer to the Issue Severity Classification:

CVSS v2 metrics

Base Score: 5.1
Base Metrics: AV:N/AC:H/Au:N/C:P/I:P/A:P
Access Vector: Network
Access Complexity: High
Authentication: None
Confidentiality Impact: Partial
Integrity Impact: Partial
Availability Impact: Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date
Red Hat Enterprise Linux version 5 (cups) RHSA-2012:0302 February 21, 2012
Red Hat Enterprise Linux version 5 (gimp) RHSA-2012:1181 August 20, 2012
Red Hat Enterprise Linux version 6 (cups) RHSA-2011:1635 December 05, 2011
Red Hat Enterprise Linux version 6 (gimp) RHSA-2012:1180 August 20, 2012

External References

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For clarification or corrections please contact the Red Hat Security Response Team.