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From: Slackware Security Team <>
Subject: [slackware-security] libpng (SSA:2008-119-01)
Date: Tue, 29 Apr 2008 00:20:31 -0700 (PDT)
Hash: SHA1

[slackware-security]  libpng (SSA:2008-119-01)

New libpng packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1,
10.2, 11.0, 12.0, and -current to fix a security issue.

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

Additional information can be found in the libpng source, or in this
file on the libpng FTP site:

Here are the details from the Slackware 12.0 ChangeLog:
  Upgraded to libpng-1.2.27.
  This fixes various bugs, the most important of which have to do with the
  handling of unknown chunks containing zero-length data.  Processing a PNG
  image that contains these could cause the application using libpng to crash
  (possibly resulting in a denial of service), could potentially expose the
  contents of uninitialized memory, or could cause the execution of arbitrary
  code as the user running libpng (though it would probably be quite difficult
  to cause the execution of attacker-chosen code).  We recommend upgrading the
  package as soon as possible.
  For more information, see:
  (* Security fix *)

Where to find the new packages:

HINT:  Getting slow download speeds from
Give a try.  This is another primary FTP site
for Slackware that can be considerably faster than downloading
directly from

Thanks to the friendly folks at the OSU Open Source Lab
( for donating additional FTP and rsync hosting
to the Slackware project!  :-)

Also see the "Get Slack" section on for
additional mirror sites near you.

Updated package for Slackware 8.1:

Updated package for Slackware 9.0:

Updated package for Slackware 9.1:

Updated package for Slackware 10.0:

Updated package for Slackware 10.1:

Updated package for Slackware 10.2:

Updated package for Slackware 11.0:

Updated package for Slackware 12.0:

Updated package for Slackware -current:

MD5 signatures:

Slackware 8.1 package:
9423c3602ea8c878e27e5a7f615bc3ce  libpng-1.2.27-i386-1_slack8.1.tgz

Slackware 9.0 package:
1746300b447e5272e48fbd61700e5a8c  libpng-1.2.27-i386-1_slack9.0.tgz

Slackware 9.1 package:
1f2d79d80ac1db5fbbae8c3b3eed12dc  libpng-1.2.27-i486-1_slack9.1.tgz

Slackware 10.0 package:
54142e20e93c4c4cb4f67d0e66d830aa  libpng-1.2.27-i486-1_slack10.0.tgz

Slackware 10.1 package:
67759c9512d4eb841aedce7f2ccd0242  libpng-1.2.27-i486-1_slack10.1.tgz

Slackware 10.2 package:
dc9badf923a5e876fe4d3b8a52b94e4f  libpng-1.2.27-i486-1_slack10.2.tgz

Slackware 11.0 package:
f604e3e8a6a32f1ca160284f8210677d  libpng-1.2.27-i486-1_slack11.0.tgz

Slackware 12.0 package:
be9224b4e88e9810765048e9583279f7  libpng-1.2.27-i486-1_slack12.0.tgz

Slackware -current package:
59551d7c03e037afc9fcb2fe2e5bd910  libpng-1.2.27-i486-1.tgz

Installation instructions:

Upgrade the package as root:
# upgradepkg libpng-1.2.27-i486-1_slack12.0.tgz

Any running programs that use libpng should be restarted.


Slackware Linux Security Team

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