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Debian Security Advisory DSA 099-1                     security@debian.org

http://www.debian.org/security/                             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

------------------------------------



  Source archives:



    xchat_1.4.3.orig.tar.gz
      MD5 checksum: 2c7c49888490bb3725b693c804ee28a1

    xchat_1.4.3-1.dsc
      MD5 checksum: 903b5af62d1eed07c49792fcc418504e

    xchat_1.4.3-1.diff.gz
      MD5 checksum: 4ed068ca2c0b85a46d9f81bcea84c562



  Architecture independent components:



    xchat-common_1.4.3-1_all.deb
      MD5 checksum: c51aa0e90c1c22f5b7c61bb32eb5d321



  Alpha architecture:



    xchat-gnome_1.4.3-1_alpha.deb
      MD5 checksum: 8a2f53441f99204f9569a78aa026c898

    xchat-text_1.4.3-1_alpha.deb
      MD5 checksum: 9b2e6bc648364e6567ed69778969c4f3

    xchat_1.4.3-1_alpha.deb
      MD5 checksum: e64f8c53b2e54b561df23c4926f75077



  ARM architecture:



    xchat-gnome_1.4.3-1_arm.deb
      MD5 checksum: 8da559c3d75c5ea877a74683c760f90e

    xchat-text_1.4.3-1_arm.deb
      MD5 checksum: 858a1f72d2f139f3bc851e408a5b9333

    xchat_1.4.3-1_arm.deb
      MD5 checksum: d974a4ba26e8002a2e75d53d14c58eea



  Intel ia32 architecture:



    xchat-gnome_1.4.3-1_i386.deb
      MD5 checksum: 2eb90d6a77af6c2475a976d282d76377

    xchat-text_1.4.3-1_i386.deb
      MD5 checksum: 9701ca60219d4ac8981293763474f14c

    xchat_1.4.3-1_i386.deb
      MD5 checksum: 1a45ebe67bd4b495cbbd9b9e1517239e



  Motorola 680x0 architecture:



    xchat_1.4.3-1_m68k.deb
      MD5 checksum: a9e8384085d77b48c69ff723abdc6a29

    xchat-gnome_1.4.3-1_m68k.deb
      MD5 checksum: a456d58e8525bd5448da59889c965a97

    xchat-text_1.4.3-1_m68k.deb
      MD5 checksum: cc1c74b5652fa87cb5d38ac7eadde8f4



  PowerPC architecture:



    xchat-gnome_1.4.3-1_powerpc.deb
      MD5 checksum: 4171d6a1318e439d206e9417828147a8

    xchat_1.4.3-1_powerpc.deb
      MD5 checksum: 31038ff5e73cfc63fbdde833e558a76f

    xchat-text_1.4.3-1_powerpc.deb
      MD5 checksum: 82d55e1f358f3f12aef5b9d6e60cff87



  Sun Sparc architecture:



    xchat-text_1.4.3-1_sparc.deb
      MD5 checksum: 21abbe3265af73e9e9cedc4128346d83

    xchat-gnome_1.4.3-1_sparc.deb
      MD5 checksum: bac9c9c55443febdf27627294648fc46

    xchat_1.4.3-1_sparc.deb
      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 http://security.debian.org/ stable/updates main

For dpkg-ftp: ftp://security.debian.org/debian-securitydists/stable/updates/main

Mailing list: debian-security-announce@lists.debian.org

Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>



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