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Category:   Application (Generic)  >   zgv Vendors:   Marks, Russell
(Debian Issues Fix) zgv Buffer Overflow in 'readgif.c' in Processing Animated GIFs May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1012549
SecurityTracker URL:  http://securitytracker.com/id/1012549
CVE Reference:   CVE-2004-0999   (Links to External Site)
Date:  Dec 16 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.8
Description:   A buffer overflow vulnerability was reported in zgv in the processing of certain types of GIF images. A remote user may be able to execute arbitrary code.

Debian reported that a remote user can create a specially crafted, multiple-image (i.e., animated) GIF image that, when processed by zgv, will trigger a segmentation fault in zgv. A remote user may be able to cause arbitrary code to be executed with the privileges of the user running zgv.

The overflow resides in 'src/readgif.c'

Mikulas Patocka is credited with discovering this flaw.

Impact:   A remote user may be able to execute arbitrary code on the target system with the privileges of the zgv process.
Solution:   Debian has released a fix for the stable distribution (woody) in version 5.5-3woody1.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2.dsc
Size/MD5 checksum: 601 f6114a026863db918a6bd9a6cc201a97
http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2.diff.gz
Size/MD5 checksum: 8541 f501ad407808235577b2bc746ddfe4e6
http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5.orig.tar.gz
Size/MD5 checksum: 329235 629386a4df72f6ec007319bf12db1374

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2_i386.deb
Size/MD5 checksum: 211772 36e675c74bafb546e5f6fb0da36385c3

Vendor URL:  www.svgalib.org/rus/zgv/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Debian)
Underlying OS Comments:  3.0

Message History:   This archive entry is a follow-up to the message listed below.
Dec 16 2004 zgv Buffer Overflow in 'readgif.c' in Processing Animated GIFs May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [SECURITY] [DSA 608-1] New zgv packages fix arbitrary code execution


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA 608-1                     security@debian.org
http://www.debian.org/security/                             Martin Schulze
December 14th, 2004                     http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : zgv
Vulnerability  : integer overflows, unsanitised input
Problem-Type   : remote
Debian-specific: no
CVE ID         : CAN-2004-1095 CAN-2004-0999
BugTraq ID     : 11556

Several vulnerabilities have been discovered in zgv, an SVGAlib
graphics viewer for the i386 architecture.  The Common Vulnerabilities
and Exposures Project identifies the following problems:

CAN-2004-1095

    Luke Macken and "infamous41md" independently discoverd multiple
    integer overflows in zgv.  Remote exploitation of an integer
    overflow vulnerability could allow the execution of arbitrary
    code.

CAN-2004-0999

    Mikulas Patocka discovered that malicious multiple-image (e.g.
    animated) GIF images can cause a segmentation fault in zgv.

For the stable distribution (woody) these problems have been fixed in
version 5.5-3woody1.

For the unstable distribution (sid) these problems will be fixed soon.

We recommend that you upgrade your zgv package immediately.


Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2.dsc
      Size/MD5 checksum:      601 f6114a026863db918a6bd9a6cc201a97
    http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2.diff.gz
      Size/MD5 checksum:     8541 f501ad407808235577b2bc746ddfe4e6
    http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5.orig.tar.gz
      Size/MD5 checksum:   329235 629386a4df72f6ec007319bf12db1374

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/z/zgv/zgv_5.5-3woody2_i386.deb
      Size/MD5 checksum:   211772 36e675c74bafb546e5f6fb0da36385c3


  These files will probably be moved into the stable distribution on
  its next update.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>

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