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Category:   Application (Instant Messaging/IRC/Chat)  >   Xchat Vendors:   Zelezny, Peter
(Fedora Issues Fix for RH Linux) XChat Socks-5 Proxy Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1011466
SecurityTracker URL:
CVE Reference:   CVE-2004-0409   (Links to External Site)
Date:  Sep 30 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:   Fedora has issued a fix.

Red Hat Linux 7.3:



The SHA1 verification checksums are:

cf1a4d68df4b21c9f19cc8ac8f87bd6802413e43 7.3/updates/SRPMS/xchat-1.8.9-1.73.2.legacy.src.rpm
ec7357872af344cb5e09556ba21865aa78e99e3d 7.3/updates/i386/xchat-1.8.9-1.73.2.legacy.i386.rpm

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  7.3

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

Subject:  [Full-Disclosure] [FLSA-2004:1549] Updated xchat packages fix security vulnerability

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               Fedora Legacy Update Advisory

Synopsis:          Updated xchat resolves security vulnerabilities
Advisory ID:       FLSA:1549
Issue date:        2004-09-30
Product:           Red Hat Linux
Keywords:          Security
Cross references:
CVE Names:         CAN-2004-0409

1. Topic:

Updated xchat packages that fix a security vulnerability are now available.

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386

3. Problem description:

X-Chat is a graphical IRC chat client for the X Window System.

A stack buffer overflow flaw was found in the X-Chat's Socks-5 proxy code.
An attacker could create a malicious Socks-5 proxy server in such a way
that X-Chat would execute arbitrary code if a victim configured X-Chat to
use the proxy.

Users of X-Chat should upgrade to this updated package which contains a
backported security patch and is not vulnerable to this issue.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the desired RPMs.

Please note that this update is also available via yum and apt.  Many
people find this an easier way to apply updates.  To use yum issue:

yum update

or to use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.  This assumes that you have yum or
apt-get configured for obtaining Fedora Legacy content. Please visit for directions on how to configure yum
and apt-get.

5. Bug IDs fixed: - 1549 - xchat CAN-2004-0409

6. RPMs required:

Red Hat Linux 7.3:



7. Verification:

SHA1 sum                                 Package Name

cf1a4d68df4b21c9f19cc8ac8f87bd6802413e43  7.3/updates/SRPMS/xchat-1.8.9-1.73.2.legacy.src.rpm
ec7357872af344cb5e09556ba21865aa78e99e3d  7.3/updates/i386/xchat-1.8.9-1.73.2.legacy.i386.rpm

These packages are GPG signed by Fedora Legacy for security.  Our key is
available from http://www.fedoralegacy org/about/security.php

You can verify each package with the following command:

    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the sha1sum with the following command:

    sha1sum <filename>

8. References:

9. Contact:

The Fedora Legacy security contact is <>. More
project details at


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Version: GnuPG v1.2.4 (GNU/Linux)



Full-Disclosure - We believe in it.


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