Debian DSA-1619-1 : python-dns - DNS response spoofing

medium Nessus Plugin ID 33739
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The remote Debian host is missing a security-related update.


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.


Upgrade the python-dns package.

For the stable distribution (etch), these problems have been fixed in version 2.3.0-5.2+etch1.

See Also

Plugin Details

Severity: Medium

ID: 33739

File Name: debian_DSA-1619.nasl

Version: 1.31

Type: local

Agent: unix

Published: 7/28/2008

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: Medium

Score: 5.2


Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P

Temporal Vector: E:POC/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:python-dns, cpe:/o:debian:debian_linux:4.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/27/2008

Reference Information

CVE: CVE-2008-1447, CVE-2008-4099, CVE-2008-4194

BID: 30131

DSA: 1619

IAVA: 2008-A-0045

CWE: 16, 399