python-dns - DNS response spoofing

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
and this specific instance in PyDNS as CVE-2008-4099.

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.