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PostPosted: Sat Mar 05, 2005 2:26 am 

Joined: Mon Mar 15, 2004 8:17 pm
Posts: 415
Location: ny
Fedora Legacy Update Advisory

Synopsis: Updated libpng resolves security vulnerabilities
Advisory ID: FLSA:1943
Issue date: 2005-02-08
Product: Red Hat Linux
Fedora Core
Keywords: Security
Cross references:
CVE Names: CVE-2002-1363, CAN-2004-0597, CAN-2004-0598,
CAN-2004-0599, CAN-2004-0768

1. Topic:

Updated libpng packages that fix security vulnerabilities are now

The libpng package contains a library of functions for creating and
manipulating PNG (Portable Network Graphics) image format files. PNG
is a bit-mapped graphics format similar to the GIF format. PNG was
created to replace the GIF format, since GIF uses a patented data
compression algorithm.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386
Red Hat Linux 9 - i386
Fedora Core 1 - i386

3. Problem description:

During a source code audit, Chris Evans discovered several buffer overflows
in libpng. An attacker could create a carefully crafted PNG file in such a
way that it would cause an application linked with libpng to execute
arbitrary code when the file was opened by a victim. The Common
Vulnerabilities and Exposures project ( has assigned the name
CAN-2004-0597 to these issues.

In addition, this audit discovered a potential NULL pointer dereference in
libpng (CAN-2004-0598) and several integer overflow issues (CAN-2004-0599).
An attacker could create a carefully crafted PNG file in such a way that
it would cause an application linked with libpng to crash when the file was
opened by the victim.

These patches also include a more complete fix for the out of bounds memory
access flaw (CVE-2002-1363), in which there was a buffer overrun while adding
filler bytes to 16-bit RGBA samples, and a similar patch (CAN-2004-0768) that
fixes a buffer overrun while adding filler bytes to 16-bit grayscale samples.

All users are advised to update to the updated libpng packages which
contain backported security patches and are not vulnerable to these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system. This assumes that you have yum or
apt-get configured for obtaining Fedora Legacy content. Please visit for directions on how to configure yum
and apt-get.

5. Bug IDs fixed: - 1943 - CAN-2004-0597to0599 libpng buffer overflows

6. RPMs required:

Red Hat Linux 9:

SRPM: ... cy.src.rpm ... cy.src.rpm

i386: ... y.i386.rpm ... y.i386.rpm ... y.i386.rpm ... y.i386.rpm

7. Verification:

SHA1 sum Package Name

cdd4dd5844581c8aa9b16e9738f9529f77a9804d redhat/9/updates/SRPMS/libpng10-1.0.15-0.9.1.legacy.src.rpm
be705f7823d379c5c99f88f4b2c2364e333379cb redhat/9/updates/SRPMS/libpng-1.2.2-20.3.legacy.src.rpm
d71f34a57a80386cdbe2bc9738f0e2b778c639e7 redhat/9/updates/i386/libpng10-1.0.15-0.9.1.legacy.i386.rpm
e89ca650e1839e4ad3155097cf6c70e239befe7c redhat/9/updates/i386/libpng10-devel-1.0.15-0.9.1.legacy.i386.rpm
7cd0d3d36280449e6cb0fe1b4478d14701ec11c5 redhat/9/updates/i386/libpng-1.2.2-20.3.legacy.i386.rpm
36ddbdaac4cc3ec1f9e23521a0ad1029714a80a2 redhat/9/updates/i386/libpng-devel-1.2.2-20.3.legacy.i386.rpm

These packages are GPG signed by Fedora Legacy for security. Our key is
available from http://www.fedoralegacy org/about/security.php

You can verify each package with the following command:

rpm –checksig -v

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the sha1sum with the following command:


8. References:

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