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[TL-Security-Announce] xchat TLSA2000022-1
From: Kevin Beyer <kbeyer () TURBOLINUX COM>
Date: Tue, 19 Sep 2000 13:54:44 -0700



___________________________________________________________________________

                        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.
 
4. 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
___________________________________________________________________________

Subscribe to the TurboLinux Security Mailing lists:

  TL-security - A moderated list for discussing security issues in TurboLinux
  products.
  Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

  TL-security-announce - An announce-only mailing list for security updates
  and alerts.
  Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security-announce

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