Daniel B. Cid discovered that fail2ban, a tool to block IP addresses that cause login failures, is too liberal about parsing SSH log files, allowing an attacker to block any IP address.

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Debian Security Advisory DSA-1456-1                  This email address is being protected from spambots. You need JavaScript enabled to view it.
http://www.debian.org/security/                          Thijs Kinkhorst
January 09, 2008                      http://www.debian.org/security/faq
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Package        : fail2ban
Vulnerability  : programming error
Problem-Type   : remote
Debian-specific: no
CVE ID         : CVE-2007-4321

Daniel B. Cid discovered that fail2ban, a tool to block IP addresses
that cause login failures, is too liberal about parsing SSH log files,
allowing an attacker to block any IP address.

For the unstable distribution (sid), this problem has been fixed in
version 0.8.0-4.

For the stable distribution (etch), this problem has been fixed in
version 0.7.5-2etch1.

The old stable distribution (sarge) doesn't contain fail2ban.

We recommend that you upgrade your fail2ban package.

Upgrade instructions
- --------------------

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 4.0 (stable)
- -------------------

Stable updates are available for alpha, amd64, arm, hppa, i386, ia64, mips, mipsel, powerpc, s390 and sparc.

Source archives:

  http://security.debian.org/pool/updates/main/f/fail2ban/fail2ban_0.7.5-2etch1.dsc
    Size/MD5 checksum:      704 67efd3e859d89b4b2d2e527ff09ac659
  http://security.debian.org/pool/updates/main/f/fail2ban/fail2ban_0.7.5-2etch1.diff.gz
    Size/MD5 checksum:    21899 c1f185e48d340020de0651962fc34402
  http://security.debian.org/pool/updates/main/f/fail2ban/fail2ban_0.7.5.orig.tar.gz
    Size/MD5 checksum:    46075 36e65b8effcfd4f4a437d214613eb916

Architecture independent packages:

  http://security.debian.org/pool/updates/main/f/fail2ban/fail2ban_0.7.5-2etch1_all.deb
    Size/MD5 checksum:    63564 afb61355977afe99b2a807a6de03685f


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

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