Debian: New fail2ban packages fix denial of service

    Date09 Jan 2008
    CategoryDebian
    4422
    Posted ByLinuxSecurity Advisories
    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.
    - ------------------------------------------------------------------------
    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
    - ------------------------------------------------------------------------
    
    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.
    
    - ---------------------------------------------------------------------------------
    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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