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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200607-06">
<title>libpng: Buffer overflow</title>
<synopsis>
A buffer overflow has been found in the libpng library that could lead to
the execution of arbitrary code.
</synopsis>
<product type="ebuild">libpng</product>
<announced>July 19, 2006</announced>
<revised>July 19, 2006: 01</revised>
<bug>138433</bug>
<bug>138672</bug>
<access>remote</access>
<affected>
<package name="media-libs/libpng" auto="yes" arch="*">
<unaffected range="ge">1.2.12</unaffected>
<vulnerable range="lt">1.2.12</vulnerable>
</package>
<package name="app-emulation/emul-linux-x86-baselibs" auto="yes" arch="amd64">
<unaffected range="ge">2.5.1</unaffected>
<vulnerable range="lt">2.5.1</vulnerable>
</package>
</affected>
<background>
<p>
libpng is an open, extensible image format library, with lossless
compression.
</p>
</background>
<description>
<p>
In pngrutil.c, the function png_decompress_chunk() allocates
insufficient space for an error message, potentially overwriting stack
data, leading to a buffer overflow.
</p>
</description>
<impact type="normal">
<p>
By enticing a user to load a maliciously crafted PNG image, an attacker
could execute arbitrary code with the rights of the user, or crash the
application using the libpng library, such as the
emul-linux-x86-baselibs.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All libpng users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=media-libs/libpng-1.2.12&quot;</code>
<p>
All AMD64 emul-linux-x86-baselibs users should also upgrade to the
latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=app-emulation/emul-linux-x86-baselibs-2.5.1&quot;</code>
</resolution>
<references>
<uri link="http://heanet.dl.sourceforge.net/sourceforge/libpng/libpng-1.2.12-README.txt">libpng Changelog</uri>
<uri link="http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3334">CVE-2006-3334</uri>
</references>
<metadata tag="requester" timestamp="Tue, 04 Jul 2006 14:10:20 +0000">
falco
</metadata>
<metadata tag="submitter" timestamp="Tue, 04 Jul 2006 18:53:23 +0000">
daxomatic
</metadata>
<metadata tag="bugReady" timestamp="Mon, 17 Jul 2006 16:54:49 +0000">
koon
</metadata>
</glsa>