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Category:   Application (Generic)  >   zgv Vendors:   Marks, Russell
(Debian Issues Fix) zgv Buffer Overflows Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1012548
SecurityTracker URL:  http://securitytracker.com/id/1012548
CVE Reference:   CVE-2004-1095   (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): 5.5 was tested
Description:   Several heap overflow vulnerabilities were reported in the zgv image viewer software. A remote user can execute arbitrary code on the target system.

sean reported that a remote user can create a specially crafted image file that, when viewed, will trigger any of several overflows in the image parameter calculation process, leading to the execution of arbitrary code.

At least eleven separate overflows were reported, affecting the following files:

readbmp.c
readgif.c
readgif.c
readmrf.c
readpcx.c
readpng.c
readpnm.c
readprf.c
readtiff.c
readxpm.c
readxpm.c
readpcd.c

Impact:   A remote user can execute arbitrary code on the target system.
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.
Oct 27 2004 zgv Buffer Overflows 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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