Vulnerability Note VU#940203

DansGuardian content filtering proxy fails to adequately validate user input thereby allowing user to access restricted site via hex encoded URLs

Overview

DansGuardian does not properly filter

I. Description

DansGuardian is an HTTP proxy server based on Squid and enhanced to filter web content. DansGuardian does not properly process URLs that contain certain unspecified hexadecimal encodings, resulting in incomplete filtering of HTTP responses. Users may be able to violate security policies or inadvertently access malicious code by following a malicious web link or requesting a malicious URL.

II. Impact

Security policies may be violated and malicious code may be accessed.

III. Solution

Upgrade

Upgrade to version 2.4.5-1 of DansGuardian:

http://mirror.dansguardian.org/downloads/2/Stable/DansGuardian-2.4.5-1.source.tar.gz

Systems Affected

Vendor	Status	Date Notified	Date Updated
Daniel Barron	Vulnerable	24-Sep-2002

References

http://online.securityfocus.com/bid/5291

Credit

Thanks to DansGuardian for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

Date Public:	2002-07-22
Date First Published:	2002-09-26
Date Last Updated:	2002-09-26
CERT Advisory:
CVE-ID(s):
NVD-ID(s):
US-CERT Technical Alerts:
Metric:	1.32
Document Revision:	3

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