77 lines
2.9 KiB
XML
77 lines
2.9 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200403-11">
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<title>Squid ACL [url_regex] bypass vulnerability</title>
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<synopsis>
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Squid versions 2.0 through to 2.5.STABLE4 could allow a remote attacker to
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bypass Access Control Lists by sending a specially-crafted URL request
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containing '%00': in such circumstances; the url_regex ACL may not properly
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detect the malicious URL, allowing the attacker to effectively bypass the
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ACL.
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</synopsis>
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<product type="ebuild">Squid</product>
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<announced>2004-03-30</announced>
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<revised count="02">2004-09-02</revised>
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<bug>45273</bug>
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<access>remote</access>
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<affected>
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<package name="net-proxy/squid" auto="yes" arch="*">
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<unaffected range="ge">2.5.5</unaffected>
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<vulnerable range="lt">2.5.5</vulnerable>
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</package>
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</affected>
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<background>
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<p>
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Squid is a fully-featured Web Proxy Cache designed to run on Unix systems
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that supports proxying and caching of HTTP, FTP, and other URLs, as well as
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SSL support, cache hierarchies, transparent caching, access control lists
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and many other features.
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</p>
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</background>
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<description>
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<p>
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A bug in Squid allows users to bypass certain access controls by passing a
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URL containing "%00" which exploits the Squid decoding function.
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This may insert a NUL character into decoded URLs, which may allow users to
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bypass url_regex access control lists that are enforced upon them.
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</p>
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<p>
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In such a scenario, Squid will insert a NUL character after
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the"%00" and it will make a comparison between the URL to the end
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of the NUL character rather than the contents after it: the comparison does
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not result in a match, and the user's request is not denied.
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</p>
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</description>
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<impact type="normal">
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<p>
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Restricted users may be able to bypass url_regex access control lists that
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are enforced upon them which may cause unwanted network traffic as well as
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a route for other possible exploits. Users of Squid 2.5STABLE4 and below
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who require the url_regex features are recommended to upgrade to 2.5STABLE5
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to maintain the security of their infrastructure.
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</p>
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</impact>
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<workaround>
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<p>
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A workaround is not currently known for this issue. All users are advised
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to upgrade to the latest version of Squid.
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</p>
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</workaround>
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<resolution>
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<p>
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Squid can be updated as follows:
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</p>
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<code>
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# emerge sync
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# emerge -pv ">=net-proxy/squid-2.5.5"
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# emerge ">=net-proxy/squid-2.5.5"</code>
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</resolution>
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<references>
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<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0189">CAN-2004-0189</uri>
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<uri link="http://www.squid-cache.org/Advisories/SQUID-2004_1.txt">Squid 2.5.STABLE5 Release Announcement</uri>
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</references>
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<metadata tag="submitter" timestamp="2004-09-02T21:11:59Z">
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vorlon078
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</metadata>
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</glsa>
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