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Netsikker nu! 2008
 
IBM AIX Mail Services Authentication Vulnerability
Secunia Advisory: SA23957
Release Date: 2007-01-29
Last Update: 2008-01-24
Popularity: 11,509 views

Critical:
Moderately critical
Impact: Security Bypass
Where: From remote
Solution Status: Vendor Patch

OS:AIX 5.x

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Description:
A vulnerability has been reported in AIX, which can be exploited by malicious people to bypass certain security restrictions.

The vulnerability is caused due to a certain variable not being initialised in the various mail services (pop3d, pop3ds, imapd, and imapds) when checking passwords during the authentication process. This can be exploited to authenticate to the services with an invalid password when the user has "rlogin" set to "false".

The vulnerability is reported in version 5.3.

Solution:
Apply interim fix:
ftp://aix.software.ibm.com/aix/efixes/security/pop3d_ifix.tar.Z

APAR for AIX 5.3.0:
IY93084 (available)

Provided and/or discovered by:
Reported by the vendor.

Changelog:
2007-02-01: Added additional details.
2008-01-24: Updated "Solution" section (APAR IY93084 is available).

Original Advisory:
IBM:
http://www-1.ibm.com/support/docview.wss?uid=isg1IY93084


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