Linux Security
Linux Security
Linux Security

Debian: 'XChat' Remote session hijacking vulnerability

Date 13 Jan 2002
Posted By LinuxSecurity Advisories
It is possible to trick XChat IRC clients into sending arbitrarycommands to the IRC server they are on, potentially allowing socialengineering attacks, channel takeovers, and denial of service.

Hash: SHA1

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Debian Security Advisory DSA 099-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
January 12th, 2002  
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Package        : XChat
Vulnerability  : IRC session hijacking
Problem-Type   : remote vulnerability
Debian-specific: no

zen-parse found a vulnerability in the XChat IRC client that allows an
attacker to take over the users IRC session.

It is possible to trick XChat IRC clients into sending arbitrary
commands to the IRC server they are on, potentially allowing social
engineering attacks, channel takeovers, and denial of service.  This
problem exists in versions 1.4.2 and 1.4.3.  Later versions of XChat
are vulnerable as well, but this behaviour is controlled by the
configuration variable »percascii«, which defaults to 0.  If it is set
to 1 then the problem becomes apparent in 1.6/1.8 a swell.

This problem has been fixed in upstream version 1.8.7 and in version
1.4.3-1 for the current stable Debian release (2.2) with a patch
provided from the upstream author Peter Zelezny.  We recommend that
you upgrade your XChat packages immediately, since this problem is
already actively being exploited.

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 2.2 alias potato
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  Source archives:
      MD5 checksum: 2c7c49888490bb3725b693c804ee28a1
      MD5 checksum: 903b5af62d1eed07c49792fcc418504e
      MD5 checksum: 4ed068ca2c0b85a46d9f81bcea84c562

  Architecture independent components:
      MD5 checksum: c51aa0e90c1c22f5b7c61bb32eb5d321

  Alpha architecture:
      MD5 checksum: 8a2f53441f99204f9569a78aa026c898
      MD5 checksum: 9b2e6bc648364e6567ed69778969c4f3
      MD5 checksum: e64f8c53b2e54b561df23c4926f75077

  ARM architecture:
      MD5 checksum: 8da559c3d75c5ea877a74683c760f90e
      MD5 checksum: 858a1f72d2f139f3bc851e408a5b9333
      MD5 checksum: d974a4ba26e8002a2e75d53d14c58eea

  Intel ia32 architecture:
      MD5 checksum: 2eb90d6a77af6c2475a976d282d76377
      MD5 checksum: 9701ca60219d4ac8981293763474f14c
      MD5 checksum: 1a45ebe67bd4b495cbbd9b9e1517239e

  Motorola 680x0 architecture:
      MD5 checksum: a9e8384085d77b48c69ff723abdc6a29
      MD5 checksum: a456d58e8525bd5448da59889c965a97
      MD5 checksum: cc1c74b5652fa87cb5d38ac7eadde8f4

  PowerPC architecture:
      MD5 checksum: 4171d6a1318e439d206e9417828147a8
      MD5 checksum: 31038ff5e73cfc63fbdde833e558a76f
      MD5 checksum: 82d55e1f358f3f12aef5b9d6e60cff87

  Sun Sparc architecture:
      MD5 checksum: 21abbe3265af73e9e9cedc4128346d83
      MD5 checksum: bac9c9c55443febdf27627294648fc46
      MD5 checksum: 8d8abf1ac399c400920725d2f0651450

  These files will probably be moved into the stable distribution on
  its next revision.

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For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
Package info: `apt-cache show ' and

Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see



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