Vulnerability Note VU#30308

Overview

The line printer daemon enables various clients to share printers over a network. There exists a flaw in the authentication method in this daemon that permits remote access to the server.

Description

A vulnerability exists in the line printer daemon (lpd) shipped with the lpr package for several systems. The authentication method was not thorough enough. If a remote user was able to control their own DNS so that their IP address resolved to the hostname of the print server, access would be granted when it should not be.

Impact

An Intruder can gain unauthorized access to the lpd server. In conjunction with another vulnerability (e.g. VU#39001), an intruder may be able to gain additional privileges.

Solution

Apply the patches provided by your vendor.

Systems Affected (Learn More)

Vendor	Status	Date Notified	Date Updated
Debian	Affected	-	04 Oct 2001
IBM	Affected	-	02 Nov 2001
RedHat	Affected	-	04 Oct 2001
Apple	Not Affected	-	09 Nov 2001
Caldera	Not Affected	04 Sep 2001	07 Nov 2001
FreeBSD	Not Affected	-	07 Nov 2001
Fujitsu	Not Affected	-	31 Oct 2001
Sun	Not Affected	-	30 Oct 2001
Compaq Computer Corporation	Unknown	-	05 Nov 2001

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

References

• http://www.kb.cert.org/vuls/id/39001
• http://www.atstake.com/research/advisories/2000/lpd_advisory.txt
• http://www.redhat.com/support/errata/RHSA2000002-01.6.0.html
• http://www.debian.org/security/2000/20000109

Credit

The CERT/CC would like to thank Red Hat and Debian for the information provided in their security advisories.

This document was written by Jason Rafail.

Other Information

• CVE IDs: Unknown
• Date Public: 08 Jan 2000
• Date First Published: 16 Oct 2001
• Date Last Updated: 09 Nov 2001
• Severity Metric: 7.87
• Document Revision: 10