There is a vulnerability in openssh with X11 forwarding.

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Debian Security Advisory                             This email address is being protected from spambots. You need JavaScript enabled to view it. 
http://www.debian.org/security/                         Wichert Akkerman
November 18, 2000
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Package        : openssh
Problem type   : remote exploit
Debian-specific: no

The adv.fwd security advisory from OpenBSD reported a problem
with openssh that Jacob Langseth <This email address is being protected from spambots. You need JavaScript enabled to view it.> found: when
the connection is established the remote ssh server can force
the ssh client to enable agent and X11 forwarding.

This has been fixed in version 1.2.3-9.1 and we recommend
that you upgrade your openssh packages immediately.

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


Debian GNU/Linux 2.2 alias potato
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  Potato was released for alpha, arm, i386, m68k, powerpc and sparc.
  Packages for sparc are not available at this moment; they
  will be announced later at  http://security.debian.org/
  
  Source archives:
 
http://security.debian.org/dists/stable/updates/main/source/openssh_1.2.3-9.1.diff.gz 
      MD5 checksum: 720a7ee40f334b5704a8acbc260ae0dc
 
http://security.debian.org/dists/stable/updates/main/source/openssh_1.2.3-9.1.dsc     
      MD5 checksum: e0c0987ec4e7b8eccd98dabbe75ea231
 
http://security.debian.org/dists/stable/updates/main/source/openssh_1.2.3.orig.tar.gz 
      MD5 checksum: 6aad0cc9ceca55f138ed1ba4cf660349
  
  Architecture indendent archives:
    
http://security.debian.org/dists/stable/updates/main/binary-all/ssh-askpass-ptk_1.2.3-9.1_all.deb
      MD5 checksum: cb2bfd756f5d4fd52ae4656f9bd61420

  Alpha architecture:
    
http://security.debian.org/dists/stable/updates/main/binary-alpha/ssh-askpass-gnome_1.2.3-9.1_alpha.deb
      MD5 checksum: a8b51ca7b67cb0e5aeedac4fa301d18c
    
http://security.debian.org/dists/stable/updates/main/binary-alpha/ssh_1.2.3-9.1_alpha.deb
      MD5 checksum: bb58e19e240adfe940fbebe2364f6f35

  ARM architecture:
    
http://security.debian.org/dists/stable/updates/main/binary-arm/ssh-askpass-gnome_1.2.3-9.1_arm.deb
      MD5 checksum: 543e76b02e7cfdb35f9b92365dc4610b
    
http://security.debian.org/dists/stable/updates/main/binary-arm/ssh_1.2.3-9.1_arm.deb
      MD5 checksum: ed70bc90de326bfec9899f4ed0ac5b6d

  Intel ia32 architecture:
    
http://security.debian.org/dists/stable/updates/main/binary-i386/ssh-askpass-gnome_1.2.3-9.1_i386.deb
      MD5 checksum: a03ebc405c792bbef06d4f3235f0a0d3
    
http://security.debian.org/dists/stable/updates/main/binary-i386/ssh_1.2.3-9.1_i386.deb
      MD5 checksum: c1dfbadec6f9ef38b1ed9391bb1e8c52

  Motorola 680x0 architecture:
    
http://security.debian.org/dists/stable/updates/main/binary-m68k/ssh-askpass-gnome_1.2.3-9.1_m68k.deb
      MD5 checksum: dcdffa2a00132500621d4eb32ecbae9a
    
http://security.debian.org/dists/stable/updates/main/binary-m68k/ssh_1.2.3-9.1_m68k.deb
      MD5 checksum: e0059e6bfe72a14a18803a507884d194

  PowerPC architecture:
    
http://security.debian.org/dists/stable/updates/main/binary-powerpc/ssh-askpass-gnome_1.2.3-9.1_powerpc.deb
      MD5 checksum: 4354d03dc3030da57bb1ce91fac6247a
    
http://security.debian.org/dists/stable/updates/main/binary-powerpc/ssh_1.2.3-9.1_powerpc.deb
      MD5 checksum: 5419aab89a4270933849430efdc0c3d2


  These files will be moved into
   ftp://ftp.debian.org/debian/dists/stable/*/binary-$arch/ soon.

For not yet released architectures please refer to the appropriate
directory  ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .

- -- 
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apt-get: deb  http://security.debian.org/ stable/updates main
dpkg-ftp:  ftp://security.debian.org/debian-security dists/stable/updates/main
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