Debian: ipmasq Insecure packet filtering rules

    Date20 Sep 2003
    CategoryDebian
    2248
    Posted ByLinuxSecurity Advisories
    Due to use ofcertain improper filtering rules, traffic arriving on the externalinterface addressed for an internal host would be forwarded,regardless of whether it was associated with an establishedconnection.
    
    - --------------------------------------------------------------------------
    Debian Security Advisory DSA 389-1                     This email address is being protected from spambots. You need JavaScript enabled to view it. 
    http://www.debian.org/security/                             Matt Zimmerman
    September 20th, 2003                     http://www.debian.org/security/faq
    - --------------------------------------------------------------------------
    
    Package        : ipmasq
    Vulnerability  : insecure packet filtering rules
    Problem-Type   : remote
    Debian-specific: no
    CVE Ids        : CAN-2003-0785
    
    ipmasq is a package which simplifies configuration of Linux IP
    masquerading, a form of network address translation which allows a
    number of hosts to share a single public IP address.  Due to use of
    certain improper filtering rules, traffic arriving on the external
    interface addressed for an internal host would be forwarded,
    regardless of whether it was associated with an established
    connection.  This vulnerability could be exploited by an attacker
    capable of forwarding IP traffic with an arbitrary destination address
    to the external interface of a system with ipmasq installed.
    
    For the current stable distribution (woody) this problem has been
    fixed in version 3.5.10c.
    
    For the unstable distribution (sid) this problem has been fixed in
    version 3.5.12.
    
    We recommend that you update your ipmasq 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 GNU/Linux 3.0 alias woody
    - --------------------------------
    
      Source archives:
    
         http://security.debian.org/pool/updates/main/i/ipmasq/ipmasq_3.5.10c.dsc
          Size/MD5 checksum:      502 f5f259d819d47b687c3da42d931b1404
         http://security.debian.org/pool/updates/main/i/ipmasq/ipmasq_3.5.10c.tar.gz
          Size/MD5 checksum:    30656 e9a9a1f86bd88dcceaeba900698165bb
    
      Architecture independent components:
    
         http://security.debian.org/pool/updates/main/i/ipmasq/ipmasq_3.5.10c_all.deb
          Size/MD5 checksum:    47748 199a747d5c48c145cf34772f26cbba4d
    
      These files will probably be moved into the stable distribution on
      its next revision.
    
    - ---------------------------------------------------------------------------------
    For apt-get: deb  http://security.debian.org/ stable/updates main
    For dpkg-ftp:  ftp://security.debian.org/debian-security 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  http://packages.debian.org/
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