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TurboLinux Security Announcement: xchat-1.4.2 and earlier

Dec 19, 2000, 22:05 (0 Talkback[s])
(Other stories by Kevin Beyer)

Date: Mon, 18 Sep 2000 19:33:47 -0700
From: Kevin Beyer kbeyer@TURBOLINUX.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: [TL-Security-Announce] xchat TLSA2000022-1


                        TurboLinux Security Announcement

        Package: xchat-1.4.2 and earlier
        Date: Monday September 18 19:20 PDT 2000

        Affected TurboLinux versions: 6.0.5 and earlier
        TurboLinux Advisory ID#:  TLSA2000022-1
        BugTraq ID#: 1601

A security hole was discovered in the package mentioned above. Please update the package in your installation as soon as possible.


1. Problem Summary

There has been a well-known vulnerability existing with all un-patched xchat versions 1.4.2 and earlier. By supplying commands enclosed in backticks (``) in URL's sent to X-Chat, it is possible to execute arbitrary commands should the X-Chat user decide to view the link by clicking on it. This is due to the manner in which X-Chat launches pages for viewing.

2. Impact

Allows an attacker to exploit shell expansion capabilities to execute commands as the user running Netscape.

3. Thanks Thanks to Zenith Parsec for reporting the security hole to Bugtraq and for updates by Zed, forgive me if I got this wrong.

3. Solution

Update the package from our ftp server by running the following command:

rpm -Uvh --nodeps --Force ftp_path_to_filename

Where ftp_path_to_filename is the following:

ftp://ftp.turbolinux.com/pub/updates/6.0/xchat-1.4.3-1.i386.rpm

The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/xchat-1.4.3-1.src.rpm

**Note: You must rebuild and install the RPM if you choose to download and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

  MD5 sum                               Package Name

56d0f9cfa44ea14d7ad5f21b9f419c17 xchat-1.4.3-1.i386.rpm
a6fa049893620723cd48e9925b5a283d xchat-1.4.3-1.src.rpm

These packages are GPG signed by Turbolinux for security. Our key is available here:

http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

rpm --checksig --nogpg name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.


You can find more updates on our ftp server:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation and Server security updates
ftp://ftp.turbolinux.com/pub/updates/4.0/security/ for TL4.0 Workstation and Server security updates

Our webpage for security announcements:

http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

rt-security@turbolinux.com