6.4 - USN-129-1

Executive Summary

Summary
Title	Squid vulnerability

Informations
Name	USN-129-1	First vendor Publication	2005-05-18
Vendor	Ubuntu	Last vendor Modification	2005-05-18
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:P/A:P)
Cvss Base Score	6.4	Attack Range	Network
Cvss Impact Score	4.9	Attack Complexity	Low
Cvss Expoit Score	10	Authentication	None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog)

The following packages are affected:

squid

The problem can be corrected by upgrading the affected package to version 2.5.5-6ubuntu0.9 (for Ubuntu 4.10), or 2.5.8-3ubuntu1.2 (for Ubuntu 5.04). In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow:

It was discovered that Squid did not verify the validity of DNS server responses. When Squid is started, it opens a DNS client UDP port whose number is randomly assigned by the operating system. Unless your network firewall is configured to accept DNS responses only from known good nameservers, this vulnerability allowed users within the local network to inject arbitrary DNS responses into Squid ("DNS spoofing"). This could be used to present different web pages to users from those they actually requested.