Vulnerability Note VU#249491

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

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.

I. 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.

II. Impact

An intruder can gain root access to the system.

III. Solution

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

Disable integrated login permissions.

Systems Affected

Vendor	Status	Date Notified	Date Updated
IBM	Vulnerable	21-Dec-2001

References

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

Credit

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

This document was written by Jason Rafail.

Other Information

Date Public:	2001-12-19
Date First Published:	2001-12-21
Date Last Updated:	2001-12-21
CERT Advisory:
CVE-ID(s):
NVD-ID(s):
US-CERT Technical Alerts:
Metric:	28.35
Document Revision:	6

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