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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200711-08">
<title>libpng: Multiple Denials of Service</title>
<synopsis>
Several vulnerabilities in libpng may allow a remote attacker to crash
applications that handle untrusted images.
</synopsis>
<product type="ebuild">libpng</product>
<announced>November 07, 2007</announced>
<revised>November 07, 2007: 01</revised>
<bug>195261</bug>
<access>remote</access>
<affected>
<package name="media-libs/libpng" auto="yes" arch="*">
<unaffected range="ge">1.2.21-r3</unaffected>
<vulnerable range="lt">1.2.21-r3</vulnerable>
</package>
</affected>
<background>
<p>
libpng is a free ANSI C library used to process and manipulate PNG
images.
</p>
</background>
<description>
<p>
An off-by-one error when handling ICC profile chunks in the
png_set_iCCP() function was discovered (CVE-2007-5266). George Cook and
Jeff Phillips reported several errors in pngrtran.c, the use of logical
instead of a bitwise functions and incorrect comparisons
(CVE-2007-5268). Tavis Ormandy reported out-of-bounds read errors in
several PNG chunk handling functions (CVE-2007-5269).
</p>
</description>
<impact type="normal">
<p>
A remote attacker could craft an image that when processed or viewed by
an application using libpng would cause the application to terminate
abnormally.
</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-1.2.21-r3&quot;</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5266">CVE-2007-5266</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5268">CVE-2007-5268</uri>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5269">CVE-2007-5269</uri>
</references>
<metadata tag="requester" timestamp="Sat, 20 Oct 2007 09:57:33 +0000">
p-y
</metadata>
<metadata tag="bugReady" timestamp="Sat, 20 Oct 2007 09:57:41 +0000">
p-y
</metadata>
<metadata tag="submitter" timestamp="Fri, 26 Oct 2007 00:26:03 +0000">
rbu
</metadata>
</glsa>