Linux Security
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Linux Security

Debian: New python-dns packages fix DNS response spoofing

Date 27 Jul 2008
4247
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.
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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
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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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