Buffer Underflow Vulnerability in the Solaris Tag Image File Format Library libtiff(3) may Lead to a Denial of Service (DoS) Condition

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A security vulnerability in the LZW decoding function of the Solaris Tag Image File Format Library libtiff(3):

1. Impact

A security vulnerability in the LZW decoding function of the Solaris Tag Image File Format Library libtiff(3) may allow a local or remote unprivileged user to crash applications that use this function via a crafted TIFF image. The ability to crash an application is a type of Denial of Service (DoS).

This issue is also described in the following document:

• CVE-2009-2285 at: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2285
  

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• GNOME 2.0 (for Solaris 8)
• Solaris 9
• Solaris 10 without patch 119900-10
• OpenSolaris based upon builds snv_01 through snv_98

x86 Platform

• GNOME 2.0 (for Solaris 8)
• Solaris 9
• Solaris 10 without patch 119901-09
• OpenSolaris based upon builds snv_01 through snv_98
  

Note 1: Sun includes libtiff(3) on the Solaris Companion CD for Solaris 8 (http://wwws.sun.com/software/solaris/freeware/index.html) as an unsupported package which installs to "/opt/sfw" and is vulnerable to this issue. Sites using libtiff(3) from the Solaris Companion CD will require an upgrade to a later version.

Note 2: This issue only affect systems which have the libtiff(3) library installed. This library is part of the SUNWTiff package. To determine if the SUNWTiff package is installed on Solaris 8, 9, and 10, the pkginfo(1) command can be used:

    $ pkginfo -q SUNWTiff && echo "SUNWTiff is installed"

Note 3: OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived.  To determine the base build of OpenSolaris, the following command can be used:

    $ uname -v
    snv_86

3. Symptoms

There are no predictable symptoms that would indicate this issue has been exploited to cause a Denial of Service (DOS) condition.

4. Workaround

To work around the described issues, do not load TIFF images from untrusted sources.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 119900-10 or later
  
• OpenSolaris based upon builds snv_99 or later
  

x86 Platform

• Solaris 10 with patch 119901-09 or later
  
• OpenSolaris based upon builds snv_99 or later

A final resolution is pending completion for Solaris 8, 9.

For more information on Security Sun Alerts, see Technical Instruction ID 213557.

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Modification History

06-Oct-2009: Updated Contributing Factors and Resolution sections.

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