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authorAlex Legler <alex@a3li.li>2015-03-08 22:02:38 +0100
committerAlex Legler <alex@a3li.li>2015-03-08 22:02:38 +0100
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+<?xml version="1.0" encoding="utf-8"?>
+<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
+<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
+<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
+
+<glsa id="200403-11">
+ <title>Squid ACL [url_regex] bypass vulnerability</title>
+ <synopsis>
+ Squid versions 2.0 through to 2.5.STABLE4 could allow a remote attacker to
+ bypass Access Control Lists by sending a specially-crafted URL request
+ containing '%00': in such circumstances; the url_regex ACL may not properly
+ detect the malicious URL, allowing the attacker to effectively bypass the
+ ACL.
+ </synopsis>
+ <product type="ebuild">Squid</product>
+ <announced>March 30, 2004</announced>
+ <revised>September 02, 2004: 02</revised>
+ <bug>45273</bug>
+ <access>remote</access>
+ <affected>
+ <package name="net-proxy/squid" auto="yes" arch="*">
+ <unaffected range="ge">2.5.5</unaffected>
+ <vulnerable range="lt">2.5.5</vulnerable>
+ </package>
+ </affected>
+ <background>
+ <p>
+ Squid is a fully-featured Web Proxy Cache designed to run on Unix systems
+ that supports proxying and caching of HTTP, FTP, and other URLs, as well as
+ SSL support, cache hierarchies, transparent caching, access control lists
+ and many other features.
+ </p>
+ </background>
+ <description>
+ <p>
+ A bug in Squid allows users to bypass certain access controls by passing a
+ URL containing &quot;%00&quot; which exploits the Squid decoding function.
+ This may insert a NUL character into decoded URLs, which may allow users to
+ bypass url_regex access control lists that are enforced upon them.
+ </p>
+ <p>
+ In such a scenario, Squid will insert a NUL character after
+ the&quot;%00&quot; and it will make a comparison between the URL to the end
+ of the NUL character rather than the contents after it: the comparison does
+ not result in a match, and the user's request is not denied.
+ </p>
+ </description>
+ <impact type="normal">
+ <p>
+ Restricted users may be able to bypass url_regex access control lists that
+ are enforced upon them which may cause unwanted network traffic as well as
+ a route for other possible exploits. Users of Squid 2.5STABLE4 and below
+ who require the url_regex features are recommended to upgrade to 2.5STABLE5
+ to maintain the security of their infrastructure.
+ </p>
+ </impact>
+ <workaround>
+ <p>
+ A workaround is not currently known for this issue. All users are advised
+ to upgrade to the latest version of Squid.
+ </p>
+ </workaround>
+ <resolution>
+ <p>
+ Squid can be updated as follows:
+ </p>
+ <code>
+ # emerge sync
+
+ # emerge -pv ">=net-proxy/squid-2.5.5"
+ # emerge ">=net-proxy/squid-2.5.5"</code>
+ </resolution>
+ <references>
+ <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189">CAN-2004-0189</uri>
+ <uri link="http://www.squid-cache.org/Advisories/SQUID-2004_1.txt">Squid 2.5.STABLE5 Release Announcement</uri>
+ </references>
+ <metadata tag="submitter" timestamp="Thu, 2 Sep 2004 21:11:59 +0000">
+ vorlon078
+ </metadata>
+</glsa>