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TITLE:
OS/400 POP3 Server User Accounts Exposure Weakness

SECUNIA ADVISORY ID:
SA14964

VERIFY ADVISORY:
https://secunia.com/advisories/14964/

CRITICAL:
Not critical

IMPACT:
Exposure of system information

WHERE:
>From remote

OPERATING SYSTEM:
OS/400 4.x
https://secunia.com/product/998/

DESCRIPTION:
Shalom Carmel has reported a weakness in OS/400, which can be
exploited by malicious people to identify valid user accounts.

The problem is that different error codes are returned depending on
whether an unsuccessful login attempt to the POP3 server is performed
with a valid or invalid username.

The weakness has been reported in version 4.5. Other versions may
also be affected.

SOLUTION:
Restrict access to the POP3 service.

PROVIDED AND/OR DISCOVERED BY:
Shalom Carmel

ORIGINAL ADVISORY:
https://www.venera.com/downloads/Enumeration_of_AS400_users_via_pop3.pdf

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
https://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
https://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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