AIX uucp Vulnerability

Original issue date: March 19,1992
Last revised: September 19, 1997
Attached copyright statement

A complete revision history is at the end of this file.

The Computer Emergency Response Team/Coordination Center (CERT/CC) has received information concerning a vulnerability with the UUCP software in versions of AIX up to 2007.  The vulnerability does not exist in AIX 3.2.

IBM is aware of this problem, and a fix is available as apar number "ix18516".  This patch is available for all AIX releases from GOLD to 2006.

The fix is in the 2007 update and 3.2 release of AIX.  IBM customers may call IBM Support (800-237-5511) and ask that the fix be shipped to them. Patches may be obtained outside the U.S. by contacting your local IBM representative.

I. Description

Previous versions, except AIX 3.2, of the UUCP software contained incorrectly configured versions of various files.

II. Impact

Local users can execute unauthorized commands and gain unauthorized root access.

III. Solution

  • If allowing users access to the uucp isn't necessary, disable it.
    % chmod 0100 /usr/bin/uucp
  • Obtain the fix from IBM Support.
  • Install the fix following the instructions in the README file.

The CERT/CC would like to thank Steve Knodle, Clarkson University, for bringing this security vulnerability to our attention.

This document is available from:

CERT/CC Contact Information

Phone: +1 412-268-7090 (24-hour hotline)
Fax: +1 412-268-6989
Postal address:
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890

CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends.

Using encryption

We strongly urge you to encrypt sensitive information sent by email.  Our public PGP key is available from

If you prefer to use DES, please call the CERT hotline for more information.

Getting security information

CERT publications and other security information are available from our web site

* "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office.

Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement.

Conditions for use, disclaimers, and sponsorship information

Copyright 1992 Carnegie Mellon University.

Revision History
September 19,1997  Attached copyright statement