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IBM AIX login fails to adequately authenticate user when configured to use loadable authentication modules

Vulnerability Note VU#249491

Original Release Date: 2001-12-21 | Last Revised: 2001-12-21

Overview

There is a remotely exploitable flaw in IBM's AIX 5.1L login when using loadable authentication modules. This does not affect AIX 4.3 and earlier.

Description

IBM AIX 5.1L login, with loadable authentication modules enabled and some non-default configurations, will permit users to login with an invalid password. This can be used to gain root access to the system. IBM AIX 4.3 and earlier are not affected by this vulnerability. IBM has issued an advisory addressing this issue.

Impact

An intruder can gain root access to the system.

Solution

IBM Has issued an advisory, and assigned this issue APAR #IY26302.

Disable integrated login permissions.

Vendor Information

249491
 

IBM Affected

Updated:  December 21, 2001

Status

Affected

Vendor Statement

http://www-1.ibm.com/services/continuity/recover1.nsf/MSS/MSS-OAR-E01-2001.603.1

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


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References

Acknowledgements

Our thanks to IBM for the information contained in their advisory.

This document was written by Jason Rafail.

Other Information

CVE IDs: None
Severity Metric: 28.35
Date Public: 2001-12-19
Date First Published: 2001-12-21
Date Last Updated: 2001-12-21 21:12 UTC
Document Revision: 7

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