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<?xml version="1.0" encoding="utf-8"?>
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<?xml-stylesheet href="/xsl/glsa.xsl" type="text/xsl"?>
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<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200312-07">
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<title>Two buffer overflows in lftp</title>
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<synopsis>
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Two buffer overflow problems are found in lftp that, in case the user visits
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a malicious ftp server, could lead to malicious code being executed.
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</synopsis>
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<product type="ebuild">lftp</product>
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<announced>December 13, 2003</announced>
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<revised>200312-07: 2</revised>
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<bug>35866</bug>
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<access>remote</access>
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<affected>
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<package name="net-ftp/lftp" auto="yes" arch="*">
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<vulnerable range="lt">2.6.10</vulnerable>
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<unaffected range="ge">2.6.10</unaffected>
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</package>
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</affected>
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<background>
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<p>
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lftp is a multithreaded command-line based FTP client. It allows you to
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execute multiple commands simultaneously or in the background. If features
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mirroring capabilities, resuming downloads, etc.
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</p>
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</background>
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<description>
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<p>
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Two buffer overflows exist in lftp. Both can occur when the user connects to
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a malicious web server using the HTTP or HTTPS protocol and issues lftp's
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"ls" or "rels" commands.
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</p>
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<p>
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Ulf Harnhammar explains:
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</p>
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<p>
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Technically, the problem lies in the file src/HttpDir.cc and the
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functions try_netscape_proxy() and try_squid_eplf(), which both
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have sscanf() calls that take data of an arbitrary length and
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store it in a char array with 32 elements. (Back in version 2.3.0,
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the problematic code was located in some other function, but the
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problem existed back then too.) Depending on the HTML document in the
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specially prepared directory, buffers will be overflown in either one
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function or the other.
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</p>
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</description>
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<impact type="low">
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<p>
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When a user issues "ls" or "rels" on a malicious server, the tftp
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application can be tricked into running arbitrary code on the user his
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machine.
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</p>
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</impact>
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<workaround>
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<p>
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There is no workaround available.
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</p>
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</workaround>
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<resolution>
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<p>
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All Gentoo users who have net-ftp/lftp installed should update to use
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version 2.6.0 or higher using these commands:
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</p>
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<code>
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# emerge sync
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# emerge -pv '>=net-ftp/lftp-2.6.10'
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# emerge '>=net-ftp/lftp-2.6.10'
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# emerge clean</code>
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</resolution>
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<references>
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<uri link="http://www.securityfocus.com/archive/1/347587/2003-12-13/2003-12-19/0">Initial report by Ulf Harnhammar</uri>
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</references>
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</glsa>
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