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  • CERT Advisory CA-1992-09 AIX Anonymous FTP Vulnerability

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Original issue date: April 27, 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 in the anonymous FTP configuration in all versions of AIX.

IBM is aware of this problem and a fix is available as apar number "ix23944". This patch is available for all AIX releases from "GOLD".

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. The fix will appear in the upcoming 2009 update and the next release of AIX.


I. Description

Previous versions of the anonymous FTP installation script, /usr/lpp/tcpip/samples/anon.ftp, incorrectly configured various files and directories.

II. Impact

Remote users can execute unauthorized commands and gain access to the system if anonymous FTP has been installed.

III. Solution

A. Obtain the fix from IBM Support.

The fix contains three files:

    a "readme" file (README.a23944),
    the fix installation script (install.a23944),
    and an archive containing the updated files (PATCH.a23944.Z).

B. Install the fix following the instructions in the README file.


The CERT/CC would like to thank Charles McGuire of the Computer Science Department, the University of Montana for bringing this security vulnerability to our attention and IBM for their response to the problem.

Copyright 1992 Carnegie Mellon University.


Revision History
September 19,1997  Attached copyright statement
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