Vulnerability Note VU#30308

lpd hostname authentication bypassed with spoofed DNS

Original Release date: 16 Oct 2001 | Last revised: 09 Nov 2001


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.


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.


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.


Apply the patches provided by your vendor.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
DebianAffected-04 Oct 2001
IBMAffected-02 Nov 2001
RedHatAffected-04 Oct 2001
AppleNot Affected-09 Nov 2001
CalderaNot Affected04 Sep 200107 Nov 2001
FreeBSDNot Affected-07 Nov 2001
FujitsuNot Affected-31 Oct 2001
SunNot Affected-30 Oct 2001
Compaq Computer CorporationUnknown-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



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


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