Bug 507465 (CVE-2009-2285) - CVE-2009-2285 libtiff: LZWDecodeCompat underflow
Summary: CVE-2009-2285 libtiff: LZWDecodeCompat underflow
Alias: CVE-2009-2285
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 507722 507723 507724 507725 507726 507728 511015 809169
Blocks: 580448
TreeView+ depends on / blocked
Reported: 2009-06-22 20:58 UTC by Mark J. Cox
Modified: 2019-09-29 12:30 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2010-06-25 09:42:41 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2009:1159 0 normal SHIPPED_LIVE Moderate: libtiff security update 2009-07-16 19:50:26 UTC

Description Mark J. Cox 2009-06-22 20:58:59 UTC
A crafted TIFF can crash libtiff in LZWDecodeCompat via underflow (different
from CVE-2008-2327).

Discussions and an analysis are at:

It is reported upstream with patch at


Comment 6 Vincent Danen 2009-06-23 22:08:22 UTC
Note that there are two related bugs with two individual patches, the first reported Jan 2009 that indicates it resolves the root cause of the underflow rather than the infinite loop when it comes up. The older bug report is here:


with the patch for bug #1985 being: http://bugzilla.maptools.org/attachment.cgi?id=279

vs the patch for bug #2065 being: http://bugzilla.maptools.org/attachment.cgi?id=314

Comment 8 Tomas Hoger 2009-06-25 22:42:26 UTC
kfax (kdegraphics) in Red Hat Enterprise Linux 3 includes embedded copy of the libtiff library, but it does not support LZW-encoded tiff images.  For further details, see:


Comment 9 Tom Lane 2009-06-27 16:32:00 UTC
Hmm, the patch at upstream bug 1985 appears to prevent the crash, and it's a much more desirable fix than the one at 2065, because it results in a complaint about the image being corrupt instead of just silently bogus output.  I wonder why Frank didn't apply that one?  I'll try to ping him privately about it.

Comment 19 Jan Lieskovsky 2009-07-01 12:19:21 UTC
Common Vulnerabilities and Exposures assigned an identifier CVE-2009-2285
to the following vulnerability:

Buffer underflow in the LZWDecodeCompat function in libtiff 3.8.2
allows context-dependent attackers to cause a denial of service
(crash) via a crafted TIFF image, a different vulnerability than


Comment 20 Fedora Update System 2009-07-01 17:30:08 UTC
libtiff-3.8.2-13.fc10 has been submitted as an update for Fedora 10.

Comment 21 Fedora Update System 2009-07-01 17:30:15 UTC
libtiff-3.8.2-13.fc11 has been submitted as an update for Fedora 11.

Comment 22 Fedora Update System 2009-07-01 17:30:22 UTC
libtiff-3.8.2-13.fc9 has been submitted as an update for Fedora 9.

Comment 24 Fedora Update System 2009-07-03 19:41:34 UTC
libtiff-3.8.2-13.fc9 has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 25 Fedora Update System 2009-07-03 19:44:52 UTC
libtiff-3.8.2-13.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 26 Fedora Update System 2009-07-03 19:55:50 UTC
libtiff-3.8.2-13.fc11 has been pushed to the Fedora 11 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 30 Tomas Hoger 2009-07-13 08:58:13 UTC
Michael, you're maintaining recently-added-to-fedora mingw32-libtiff packages, that may need this as well.  You can find updated libtiff-3.8.2-lzw-bugs.patch patch in libtiff package CVS.

Comment 32 errata-xmlrpc 2009-07-16 19:50:40 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 3
  Red Hat Enterprise Linux 4
  Red Hat Enterprise Linux 5

Via RHSA-2009:1159 https://rhn.redhat.com/errata/RHSA-2009-1159.html

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