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

Medium Nessus Plugin ID 33739

Synopsis

The remote Debian host is missing a security-related update.

Description

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.

Solution

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

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=490217

https://security-tracker.debian.org/tracker/CVE-2008-1447

https://security-tracker.debian.org/tracker/CVE-2008-4099

https://www.debian.org/security/2008/dsa-1619

Plugin Details

Severity: Medium

ID: 33739

File Name: debian_DSA-1619.nasl

Version: 1.29

Type: local

Agent: unix

Published: 2008/07/28

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.4

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

Vulnerability Information

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2008/07/27

Reference Information

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

BID: 30131

DSA: 1619

IAVA: 2008-A-0045

CWE: 16, 399