[CLA-2002:526] Conectiva Linux Security Announcement - xchat

From: secure@conectiva.com.br
Date: 09/23/02 

Date: Mon, 23 Sep 2002 16:21:33 -0300
To: conectiva-updates@papaleguas.conectiva.com.br, lwn@lwn.net, bugtraq@securityfocus.com, security-alerts@linuxsecurity.com
From: secure@conectiva.com.br

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : xchat
SUMMARY : /dns command vulnerability
DATE : 2002-09-23 16:20:00
ID : CLA-2002:526
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
 XChat is a popular graphical IRC client available in most linux
 distributions.
 
 XChat prior to version 1.8.9 has a vulnerability[1] that may allow a
 remote attacker to execute arbitrary commands in the IRC client
 context. The vulnerability resides in the way xchat handles the IRC
 server response for the /dns command. It passes the response directly
 to a shell without filtering it. An attacker with administration
 privileges in the IRC server can insert escaped commands in such a
 response, which will be executed by the client's shell.
 
 Please note that in order to have this vulnerability exploited, the
 xchat user must be connected to an IRC server where the attacker has
 administration privileges and must also run the /dns command.

SOLUTION
 All xchat users should upgrade.
 
 
 REFERENCES:
 1.http://marc.theaimsgroup.com/?l=bugtraq&m=101725430425490&w=2
 2.http://distro.conectiva.com.br/bugzilla/show_bug.cgi?id=6596

DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/xchat-1.8.10-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/xchat-1.8.10-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/xchat-1.8.10-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/xchat-gtk-1.8.10-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/xchat-1.8.10-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/xchat-1.8.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/xchat-gtk-1.8.10-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/xchat-1.8.10-1U80_1cl.src.rpm

ADDITIONAL INSTRUCTIONS
 Users of Conectiva Linux version 6.0 or higher may use apt to perform
 upgrades of RPM packages:
 - add the following line to /etc/apt/sources.list if it is not there yet
   (you may also use linuxconf to do this):

 rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

 - run: apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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Relevant Pages

  • [RHSA-2002:097-08] Updated xchat packages fix /dns vulnerability
    ... XChat is a popular cross-platform IRC client. ... where is a list of the RPMs you wish to upgrade. ... Please note that this update is also available via Red Hat Network. ... You can verify each package with the following command: ...
    (Bugtraq)
  • freenode
    ... I came across a link that in early january freenode had an attack. ... In any event, my IRC has been buggered from approximately that time, give or take a week. ... I was able to connect with at least one server using xchat. ...
    (Fedora)
  • Xchat /dns command execution vulnerability
    ... Xchat - Remote command execution ... There is an issue by the way xchat handle the /exec command, ... the attacker may force a server to respond to a whois ...
    (Bugtraq)
  • Re: IRC is not a registered protocol
    ... > Anyone know how i make the association between mozilla ... > or firefox and IRC ctcp links? ... it usually an informative type of link that you then direct to xchat, ... something to download. ...
    (Debian-User)
  • Re: Possible hole in xchat
    ... Xchat 1.8.6 does seg faults in Slackware 8.0 too. ... // When you excute a command using exec -o in xchat, ... Endless Loop: n., see Loop, Endless. ...
    (Vuln-Dev)