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

Original Release date: 26 Sep 2002 | Last revised: 26 Sep 2002


DansGuardian does not properly filter


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.


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



Upgrade to version 2.4.5-1 of DansGuardian:

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Daniel BarronAffected-24 Sep 2002
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to DansGuardian for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

  • CVE IDs: Unknown
  • Date Public: 22 Jul 2002
  • Date First Published: 26 Sep 2002
  • Date Last Updated: 26 Sep 2002
  • Severity Metric: 1.32
  • Document Revision: 3


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