[SECURITY] [DSA-1619-2] New python-dns package fixes regression

ID DEBIAN:DSA-1619-2:7599F
Type debian
Reporter Debian
Modified 2008-09-22T06:12:15


Debian Security Advisory DSA-1619-2 security@debian.org http://www.debian.org/security/ Devin Carraway September 22, 2008 http://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

In DSA-1619-1, an update was announced for DNS response spoofing vulnerabilities in python-dns. The fix introduced a regression in the library breaking the resolution of UTF-8 encoded record names. An updated release is available which corrects this problem. For reference, the original advisory text follows.

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+etch2.

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:

http://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch2.diff.gz Size/MD5 checksum: 3807 4c9dceefe0dfc4ee933f3c9298764153 http://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0.orig.tar.gz Size/MD5 checksum: 21084 82d377c6a59181072b30b0da4e9835b8 http://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch2.dsc Size/MD5 checksum: 695 16b84a9d56bdd4baf5cdf1bf7e413521

Architecture independent packages:

http://security.debian.org/pool/updates/main/p/python-dns/python-dns_2.3.0-5.2+etch2_all.deb Size/MD5 checksum: 22972 59775332c3bb11b1408c83cf25b8e253

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 Mailing list: debian-security-announce@lists.debian.org Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>