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Category:   Application (Multimedia)  >   libpng Vendors:   libpng.sourceforge.net
(Slackware Issues Fix) libpng Memory Access Violation When Creating Error Messages May Cause Denial of Service Conditions
SecurityTracker Alert ID:  1010049
SecurityTracker URL:  http://securitytracker.com/id/1010049
CVE Reference:   CAN-2004-0421   (Links to External Site)
Date:  May 4 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in libpng. A remote user can create a PNG image that, when processed by libpng, may cause denial of service conditions.

Mandrake reported that when libpng creates an error message, libpng may access invalid memory locations. As a result, an application using libpng may crash or core dump when processing certain PNG images, the report said.

Steve Grubb is credited with discovering this flaw.

Impact:   A remote user can create a malformed PNG image that, when processed by an application using libpng, may cause the application to crash. The specific impact depends on the application using libpng.
Solution:   Slackware has released a fix.

Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/libpng-1.2.5-i386-2.tgz

Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/libpng-1.2.5-i486-2.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/libpng-1.2.5-i486-2.tgz

The MD5 signatures are:

Slackware 9.0 package:
6c68e6a65850e26b60651d65fd8c0a2f libpng-1.2.5-i386-2.tgz

Slackware 9.1 package:
781c7e61997c34c5c70855be40012bb9 libpng-1.2.5-i486-2.tgz

Slackware -current package:
476b916ded315a2eba0af3c6637d770b libpng-1.2.5-i486-2.tgz

Vendor URL:  www.libpng.org/pub/png/libpng.html (Links to External Site)
Cause:   Access control error, Resource error
Underlying OS:   Linux (Slackware)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 30 2004 libpng Memory Access Violation When Creating Error Messages May Cause Denial of Service Conditions



 Source Message Contents

Date:  Mon, 3 May 2004 13:08:30 -0700 (PDT)
Subject:  [slackware-security] libpng update (SSA:2004-124-04)



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

[slackware-security]  libpng update (SSA:2004-124-04)

New libpng packages are available for Slackware 9.0, 9.1, and -current to
fix an issue where libpng could be caused to crash, perhaps creating a denial
of service issue if network services are linked with it.

More details about this issue may be found in the Common
Vulnerabilities and Exposures (CVE) database:

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0421

Here are the details from the Slackware 9.1 ChangeLog:
+--------------------------+
Sun May  2 17:16:41 PDT 2004
patches/packages/libpng-1.2.5-i486-2.tgz:  Patched a problem where
  libpng may access memory that is out of bounds when creating an error
  message, possibly crashing libpng and creating a denial of service.
  For more details, see:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0421
  (* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/libpng-1.2.5-i386-2.tgz

Updated package for Slackware 9.1:
ftp://ftp.slackware.com/pub/slackware/slackware-9.1/patches/packages/libpng-1.2.5-i486-2.tgz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/libpng-1.2.5-i486-2.tgz


MD5 signatures:
+-------------+

Slackware 9.0 package:
6c68e6a65850e26b60651d65fd8c0a2f  libpng-1.2.5-i386-2.tgz

Slackware 9.1 package:
781c7e61997c34c5c70855be40012bb9  libpng-1.2.5-i486-2.tgz

Slackware -current package:
476b916ded315a2eba0af3c6637d770b  libpng-1.2.5-i486-2.tgz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg libpng-1.2.5-i486-2.tgz


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com

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