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Category:   Application (Instant Messaging/IRC/Chat)  >   Xchat Vendors:   Zelezny, Peter
(Mandrake Issues Fix) XChat Socks-5 Proxy Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1009905
SecurityTracker URL:  http://securitytracker.com/id/1009905
CVE Reference:   CAN-2004-0409   (Links to External Site)
Date:  Apr 21 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.8.0 to 2.0.8
Description:   A stack overflow vulnerability was reported in XChat in the Socks-5 proxy code. A remote user can execute arbitrary code on the target system in certain cases.

The vendor reported that if socks5 traversal is enabled (not the default configuration), then a remote user with a malicious proxy server can trigger the overflow when the target user connects to the malicious proxy server. Arbitrary code can be executed on the target user's system with the privileges of the user running the xchat process.

The vendor credits tsifra with discovering this bug.

Impact:   A remote user can cause arbitrary code to be executed on a target user's system when the target user connects to a malicious proxy server.
Solution:   Mandrake has released a fix.

Mandrakelinux 10.0:
7b35c6f47155aa2a279ae725f00e1ce6 10.0/RPMS/xchat-2.0.7-6.1.100mdk.i586.rpm
5576b90985a43bf934dffdcac3b8f489 10.0/RPMS/xchat-perl-2.0.7-6.1.100mdk.i586.rpm
82530135e527cd8ac99193368a81c3fb 10.0/RPMS/xchat-python-2.0.7-6.1.100mdk.i586.rpm
0135f544782942c6db5b5394bbc897f5 10.0/RPMS/xchat-tcl-2.0.7-6.1.100mdk.i586.rpm
1f80f67e7f5d26990aea8ec5c6a09f93 10.0/SRPMS/xchat-2.0.7-6.1.100mdk.src.rpm

Mandrakelinux 9.2:
54bc115f40f7e54fcf4a2c4d52f5676b 9.2/RPMS/xchat-2.0.4-7.1.92mdk.i586.rpm
b4762090848984ffc768be8b0eab5296 9.2/RPMS/xchat-perl-2.0.4-7.1.92mdk.i586.rpm
372ecbb839019c91a90a206e014eab5b 9.2/RPMS/xchat-python-2.0.4-7.1.92mdk.i586.rpm
79bda0db4e637c2f8517ad380503b139 9.2/RPMS/xchat-tcl-2.0.4-7.1.92mdk.i586.rpm
4bbadb5f6c4536a353e0e726ba1be312 9.2/SRPMS/xchat-2.0.4-7.1.92mdk.src.rpm

Mandrakelinux 9.2/AMD64:
ec523f612ef1b6f7b8387653c40b0e5b amd64/9.2/RPMS/xchat-2.0.4-7.1.92mdk.amd64.rpm
78a3374d55635a9f746a4c847abec7c6 amd64/9.2/RPMS/xchat-perl-2.0.4-7.1.92mdk.amd64.rpm
0960061780b52f51e560905abd24b321 amd64/9.2/RPMS/xchat-python-2.0.4-7.1.92mdk.amd64.rpm
b4985a2e3f5e8d2bc249e6b7cc1d0cd3 amd64/9.2/RPMS/xchat-tcl-2.0.4-7.1.92mdk.amd64.rpm
4bbadb5f6c4536a353e0e726ba1be312 amd64/9.2/SRPMS/xchat-2.0.4-7.1.92mdk.src.rpm

Vendor URL:  xchat.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Mandriva/Mandrake)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 19 2004 XChat Socks-5 Proxy Buffer Overflow Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Date:  21 Apr 2004 22:19:04 -0000
Subject:  MDKSA-2004:036 - Updated xchat packages fix remote vulnerability


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

 _______________________________________________________________________

                 Mandrakelinux Security Update Advisory
 _______________________________________________________________________

 Package name:           xchat
 Advisory ID:            MDKSA-2004:036
 Date:                   April 21st, 2004

 Affected versions:	 10.0, 9.2
 ______________________________________________________________________

 Problem Description:

 A remotely exploitable vulnerability was discovered in the Socks-5
 proxy code in XChat.  By default, socks5 traversal is disabled, and
 one would also need to connect to an attacker's own custom proxy
 server in order for this to be exploited.  Successful exploitation
 could lead to arbitrary code execution as the user running XChat.
 
 The provided packages are patched to prevent this problem.
 _______________________________________________________________________

 References:

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0409
  http://mail.nl.linux.org/xchat-announce/2004-04/msg00000.html
 ______________________________________________________________________

 Updated Packages:
  
 Mandrakelinux 10.0:
 7b35c6f47155aa2a279ae725f00e1ce6  10.0/RPMS/xchat-2.0.7-6.1.100mdk.i586.rpm
 5576b90985a43bf934dffdcac3b8f489  10.0/RPMS/xchat-perl-2.0.7-6.1.100mdk.i586.rpm
 82530135e527cd8ac99193368a81c3fb  10.0/RPMS/xchat-python-2.0.7-6.1.100mdk.i586.rpm
 0135f544782942c6db5b5394bbc897f5  10.0/RPMS/xchat-tcl-2.0.7-6.1.100mdk.i586.rpm
 1f80f67e7f5d26990aea8ec5c6a09f93  10.0/SRPMS/xchat-2.0.7-6.1.100mdk.src.rpm

 Mandrakelinux 9.2:
 54bc115f40f7e54fcf4a2c4d52f5676b  9.2/RPMS/xchat-2.0.4-7.1.92mdk.i586.rpm
 b4762090848984ffc768be8b0eab5296  9.2/RPMS/xchat-perl-2.0.4-7.1.92mdk.i586.rpm
 372ecbb839019c91a90a206e014eab5b  9.2/RPMS/xchat-python-2.0.4-7.1.92mdk.i586.rpm
 79bda0db4e637c2f8517ad380503b139  9.2/RPMS/xchat-tcl-2.0.4-7.1.92mdk.i586.rpm
 4bbadb5f6c4536a353e0e726ba1be312  9.2/SRPMS/xchat-2.0.4-7.1.92mdk.src.rpm

 Mandrakelinux 9.2/AMD64:
 ec523f612ef1b6f7b8387653c40b0e5b  amd64/9.2/RPMS/xchat-2.0.4-7.1.92mdk.amd64.rpm
 78a3374d55635a9f746a4c847abec7c6  amd64/9.2/RPMS/xchat-perl-2.0.4-7.1.92mdk.amd64.rpm
 0960061780b52f51e560905abd24b321  amd64/9.2/RPMS/xchat-python-2.0.4-7.1.92mdk.amd64.rpm
 b4985a2e3f5e8d2bc249e6b7cc1d0cd3  amd64/9.2/RPMS/xchat-tcl-2.0.4-7.1.92mdk.amd64.rpm
 4bbadb5f6c4536a353e0e726ba1be312  amd64/9.2/SRPMS/xchat-2.0.4-7.1.92mdk.src.rpm
 _______________________________________________________________________

 To upgrade automatically use MandrakeUpdate or urpmi.  The verification
 of md5 checksums and GPG signatures is performed automatically for you.

 A list of FTP mirrors can be obtained from:

  http://www.mandrakesecure.net/en/ftp.php

 All packages are signed by Mandrakesoft for security.  You can obtain
 the GPG public key of the Mandrakelinux Security Team by executing:

  gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98

 Please be aware that sometimes it takes the mirrors a few hours to
 update.

 You can view other update advisories for Mandrakelinux at:

  http://www.mandrakesecure.net/en/advisories/

 Mandrakesoft has several security-related mailing list services that
 anyone can subscribe to.  Information on these lists can be obtained by
 visiting:

  http://www.mandrakesecure.net/en/mlist.php

 If you want to report vulnerabilities, please contact

  security_linux-mandrake.com

 Type Bits/KeyID     Date       User ID
 pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security linux-mandrake.com>
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