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msg00000.html

msg00000.html
Posted Apr 19, 2004
Authored by tsifra | Site xchat.org

XChat versions 2.0.8 through 1.8.0 are vulnerable to a boundary error condition in their SOCKS-5 proxy code. Successful exploitation can lead to a complete system compromise.

tags | advisory
SHA-256 | d5f20b76db2c8dc08bf4e18ba72b64835cbb45e7648c299108cb57c4fec1bc1e
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msg00000.html

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<!-- MHonArc v2.6.8 -->
<!--X-Subject: xchat 2.0.x Socks5 Vulnerability -->
<!--X-From-R13: Brgre Lryrmal <mrqNkpung.bet> -->
<!--X-Date: Mon, 05 Apr 2004 09:12:28 +0200 -->
<!--X-Message-Id: 20040405171305.04f19c44.zed@xchat.org -->
<!--X-Content-Type: text/plain -->
<!--X-Head-End-->
<!doctype html public "-//W3C//DTD HTML//EN">
<html>
<head>
<title>xchat 2.0.x Socks5 Vulnerability</title>
</head>
<body>
<!--X-Body-Begin-->
<!--X-User-Header-->
<!--X-User-Header-End-->
<!--X-TopPNI-->
<hr>
[Date Prev][Date Next][Thread Prev][Thread Next][<a href="maillist.html#00000">Date Index</a>][<a href="index.html#00000">Thread Index</a>]
<!--X-TopPNI-End-->
<!--X-MsgBody-->
<!--X-Subject-Header-Begin-->
<h1>xchat 2.0.x Socks5 Vulnerability</h1>
<hr>
<!--X-Subject-Header-End-->
<!--X-Head-of-Message-->
<ul>
<li><em>To</em>: <a href="mailto:xchat-announce@DOMAIN.HIDDEN">xchat-announce@xxxxxxxxxxxx</a></li>
<li><em>Subject</em>: xchat 2.0.x Socks5 Vulnerability</li>
<li><em>From</em>: Peter Zelezny <<a href="mailto:zed@DOMAIN.HIDDEN">zed@xxxxxxxxx</a>></li>
<li><em>Date</em>: Mon, 5 Apr 2004 17:13:05 +1000</li>
<li><em>List-archive</em>: <<a href="http://mail.nl.linux.org/xchat-announce/">http://mail.nl.linux.org/xchat-announce/</a>></li>
<li><em>List-help</em>: <<a href="mailto:ecartis@nl.linux.org?Subject=help">mailto:ecartis@nl.linux.org?Subject=help</a>></li>
<li><em>List-id</em>: <xchat-announce.nl.linux.org></li>
<li><em>List-owner</em>: <<a href="mailto:riel@nl.linux.org">mailto:riel@nl.linux.org</a>></li>
<li><em>List-post</em>: <<a href="mailto:xchat-announce@nl.linux.org">mailto:xchat-announce@nl.linux.org</a>></li>
<li><em>List-software</em>: Ecartis version 1.0.0</li>
<li><em>List-subscribe</em>: <<a href="mailto:xchat-announce-request@nl.linux.org?Subject=subscribe">mailto:xchat-announce-request@nl.linux.org?Subject=subscribe</a>></li>
<li><em>List-unsubscribe</em>: <<a href="mailto:xchat-announce-request@nl.linux.org?Subject=unsubscribe">mailto:xchat-announce-request@nl.linux.org?Subject=unsubscribe</a>></li>
<li><em>Reply-to</em>: <a href="mailto:xchat-discuss@DOMAIN.HIDDEN">xchat-discuss@xxxxxxxxxxxx</a></li>
<li><em>Sender</em>: <a href="mailto:xchat-announce-bounce@DOMAIN.HIDDEN">xchat-announce-bounce@xxxxxxxxxxxx</a></li>
</ul>
<!--X-Head-of-Message-End-->
<!--X-Head-Body-Sep-Begin-->
<hr>
<!--X-Head-Body-Sep-End-->
<!--X-Body-of-Message-->
<pre>
Hi XChat users,

XChat's Socks-5 proxy code is vulnerable to a remote exploit. To
successfully exploit the code, you would need to enable socks5 
traversal (default off) and connect to the attacker's own custom
proxy server.

If you never intend to use a Socks5 proxy, you are not affected at
all by this issue.

Type of exploit:
~~~~~~~~~~~~~~~~
  Stack overflow caused by inadequate input validation. The
  attacker could take control of the User that ran the xchat
  process.


Versions affected:
~~~~~~~~~~~~~~~~~~
  From 1.8.0 to 2.0.8.


Work around:
~~~~~~~~~~~~
  Don't use socks 5 proxies.


Solution:
~~~~~~~~~
  Source code patch is available at:
    <a  href="http://xchat.org/files/source/2.0/patches/">http://xchat.org/files/source/2.0/patches/</a>
  The Fedora RPMs at www.xchat.org have been rebuilt with this
  patch applied.


Original source of code:
~~~~~~~~~~~~~~~~~~~~~~~~
  <a  href="http://mail.nl.linux.org/xchat-discuss/2001-05/msg00116.html">http://mail.nl.linux.org/xchat-discuss/2001-05/msg00116.html</a>



Credit goes to tsifra for finding this bug.


-- 
Peter.

--
XChat-announce:  Xchat announcement list
Archive:         <a  href="http://mail.nl.linux.org/xchat-announce/">http://mail.nl.linux.org/xchat-announce/</a>


</pre>
<!--X-Body-of-Message-End-->
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<hr>
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<!--X-BotPNI-->
<ul>
<li>Index(es):
<ul>
<li><a href="maillist.html#00000"><strong>Date</strong></a></li>
<li><a href="index.html#00000"><strong>Thread</strong></a></li>
</ul>
</li>
</ul>

<!--X-BotPNI-End-->
<!--X-User-Footer-->
<!--X-User-Footer-End-->
</body>
</html>
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