Linux Security
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    Linux Security

    Debian: New pdns-recursor packages fix predictable randomness

    Date
    4891
    Posted By
    Thomas Biege discovered that the upstream fix for the weak random number generator released in DSA-1544-1 was incomplete: Source port randomization did still not use difficult-to-predict random numbers. This is corrected in this security update.
    - ------------------------------------------------------------------------
    Debian Security Advisory DSA-1544-2                  This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                           Florian Weimer
    July 16, 2008                         https://www.debian.org/security/faq
    - ------------------------------------------------------------------------
    
    Package        : pdns-recursor
    Vulnerability  : insufficient randomness
    Problem type   : remote
    Debian-specific: no
    CVE Id(s)      : CVE-2008-1637
    Debian Bug     : 490069
    
    Thomas Biege discovered that the upstream fix for the weak random number
    generator released in DSA-1544-1 was incomplete:  Source port
    randomization did still not use difficult-to-predict random numbers.
    This is corrected in this security update.
    
    Here is the text of the original advisory:
    
      Amit Klein discovered that pdns-recursor, a caching DNS resolver, uses
      a weak random number generator to create DNS transaction IDs and UDP
      source port numbers. As a result, cache poisoning attacks were
      simplified. (CVE-2008-1637)
    
    In the light of recent DNS-related developments (documented in DSAs
    1603, 1604, 1605), we recommend that this update is installed as an
    additional safety measure.  (The lack of source port randomization was
    addressed in the 3.1.6 upstream version.)
    
    In addition, this update incorporates the changed IP address of
    L.ROOT-SERVERS.NET.
    
    For the stable distribution (etch), this problem has been fixed in
    version 3.1.4-1+etch2.
    
    For the unstable distribution (sid), this problem has been fixed in
    version 3.1.7-1.
    
    We recommend that you upgrade your pdns-recursor 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 4.0 alias etch
    - -------------------------------
    
    Source archives:
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2.diff.gz
        Size/MD5 checksum:    34915 0d67af6859a24778f87137fb159b19d6
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4.orig.tar.gz
        Size/MD5 checksum:   171270 e35d774e3282285a59a7f8038a036b61
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2.dsc
        Size/MD5 checksum:     1198 264388cc310a18ffcede810e510d26dc
    
    alpha architecture (DEC Alpha)
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_alpha.deb
        Size/MD5 checksum:   499184 d975957b892261bef540029738fbc816
    
    amd64 architecture (AMD x86_64 (AMD64))
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_amd64.deb
        Size/MD5 checksum:   418498 f5c48c3dfa05a888c38416b7c3b1e9ee
    
    i386 architecture (Intel ia32)
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_i386.deb
        Size/MD5 checksum:   433786 33e5e4d147b1f7408dee93f014845e4b
    
    ia64 architecture (Intel ia64)
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_ia64.deb
        Size/MD5 checksum:   598166 f1b98150ec6cb205eb10d5dcc69f1684
    
    powerpc architecture (PowerPC)
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_powerpc.deb
        Size/MD5 checksum:   434308 4d9376157024a98cb3217f884c74f42f
    
    s390 architecture (IBM S/390)
    
      https://security.debian.org/pool/updates/main/p/pdns-recursor/pdns-recursor_3.1.4-1+etch2_s390.deb
        Size/MD5 checksum:   408966 87930fd404bbab5c43332711511fedc7
    
    
      These files will probably be moved into the stable distribution on
      its next update.
    
    - ---------------------------------------------------------------------------------
    For apt-get: deb https://security.debian.org/ stable/updates main
    For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
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