IBM AS400 and iSeries POP3 Server Remote Information Disclosure

This script is Copyright (C) 2005-2011 Tenable Network Security, Inc.


Synopsis :

The remote POP server is affected by an information disclosure
vulnerability.

Description :

The remote host appears to be running the POP3 service that comes with
all modern AS/400 and iSeries servers. Further, this service is prone
to an information disclosure vulnerability due to the responses it
provides to username / password combinations. This allows a remote
attacker to determine valid user profiles. Further, the service
offers a means of brute forcing passwords since it does not block a
connection or disable a user after a given number of invalid login
attempts.

See also :

http://www.venera.com/downloads/Enumeration_of_AS400_users_via_pop3.pdf

Solution :

Disable the POP3 service if not needed.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 5.0
(CVSS2#E:H/RL:U/RC:ND)
Public Exploit Available : true

Family: Misc.

Nessus Plugin ID: 18046 (as400_pop3_info_disclosure.nasl)

Bugtraq ID: 13156

CVE ID: CVE-2005-1133