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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200511-23">
<title>chmlib, KchmViewer: Stack-based buffer overflow</title>
<synopsis>
chmlib and KchmViewer contain a buffer overflow vulnerability which may
lead to the execution of arbitrary code.
</synopsis>
<product type="ebuild">chmlib kchmviewer</product>
<announced>November 28, 2005</announced>
<revised>May 28, 2009: 03</revised>
<bug>110557</bug>
<access>remote</access>
<affected>
<package name="dev-libs/chmlib" auto="yes" arch="*">
<unaffected range="ge">0.37.4</unaffected>
<vulnerable range="lt">0.37.4</vulnerable>
</package>
<package name="app-text/kchmviewer" auto="yes" arch="*">
<unaffected range="ge">1.1</unaffected>
<vulnerable range="lt">1.1</vulnerable>
</package>
</affected>
<background>
<p>
chmlib is a library for dealing with Microsoft ITSS and CHM format
files. KchmViewer is a CHM viewer that includes its own copy of the
chmlib library.
</p>
</background>
<description>
<p>
Sven Tantau reported about a buffer overflow vulnerability in
chmlib. The function "_chm_decompress_block()" does not properly
perform boundary checking, resulting in a stack-based buffer overflow.
</p>
</description>
<impact type="normal">
<p>
By convincing a user to open a specially crafted ITSS or CHM file,
using KchmViewer or a program makes use of chmlib, a remote attacker
could execute arbitrary code with the privileges of the user running
the software.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All chmlib users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=dev-libs/chmlib-0.37.4&quot;</code>
<p>
All KchmViewer users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=app-text/kchmviewer-1.1&quot;</code>
</resolution>
<references>
<uri link="http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3318">CVE-2005-3318</uri>
</references>
<metadata tag="requester" timestamp="Fri, 25 Nov 2005 10:03:15 +0000">
koon
</metadata>
<metadata tag="submitter" timestamp="Sat, 26 Nov 2005 02:10:11 +0000">
adir
</metadata>
<metadata tag="bugReady" timestamp="Sun, 27 Nov 2005 20:16:26 +0000">
adir
</metadata>
</glsa>