Linux Security
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    Linux Security

    Debian: New python-dns packages fix DNS response spoofing

    Date 27 Jul 2008
    4210
    Posted By LinuxSecurity Advisories
    Multiple weaknesses have been identified in PyDNS, a DNS client implementation for the Python language. Dan Kaminsky identified a practical vector of DNS response spoofing and cache poisoning, exploiting the limited entropy in a DNS transaction ID and lack of UDP source port randomization in many DNS implementations. Scott Kitterman noted that python-dns is vulnerable to this predictability, as it randomizes neither its transaction ID nor its source port. Taken together, this lack of entropy leaves applications using python-dns to perform DNS queries highly susceptible to response forgery.
    - ------------------------------------------------------------------------
    Debian Security Advisory DSA-1619-1                  This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                           Devin Carraway
    July 27, 2008                         https://www.debian.org/security/faq
    - ------------------------------------------------------------------------
    
    Package        : python-dns
    Vulnerability  : DNS response spoofing
    Problem type   : remote
    Debian-specific: no
    CVE Id(s)      : CVE-2008-1447
    Debian Bug     : 490217
    
    Multiple weaknesses have been identified in PyDNS, a DNS client
    implementation for the Python language.  Dan Kaminsky identified a
    practical vector of DNS response spoofing and cache poisoning,
    exploiting the limited entropy in a DNS transaction ID and lack of
    UDP source port randomization in many DNS implementations.  Scott
    Kitterman noted that python-dns is vulnerable to this predictability,
    as it randomizes neither its transaction ID nor its source port.
    Taken together, this lack of entropy leaves applications using
    python-dns to perform DNS queries highly susceptible to response
    forgery.
    
    The Common Vulnerabilities and Exposures project identifies this
    class of weakness as CVE-2008-1447.
    
    For the stable distribution (etch), these problems have been fixed in
    version 2.3.0-5.2+etch1.
    
    We recommend that you upgrade your python-dns 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
    - -------------------------------
    
    Debian (stable)
    - ---------------
    
    Stable updates are available for alpha, amd64, arm, hppa, i386, ia64, mips, mipsel, powerpc, s390 and sparc.
    
    Source archives:
    
      https://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0.orig.tar.gz
        Size/MD5 checksum:    21084 82d377c6a59181072b30b0da4e9835b8
      https://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch1.diff.gz
        Size/MD5 checksum:     3444 06a021e1cf9836cec4bbe72461bab137
      https://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch1.dsc
        Size/MD5 checksum:      695 c2e7178128b7033952b7795b358dea0b
    
    Architecture independent packages:
    
      https://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch1_all.deb
        Size/MD5 checksum:    22750 b544ce3edb7d2051811ec743a49206a1
    
    
      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
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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