From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Mar 03 2004 - 10:23:12 CST

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TITLE:
1st Class Mail Server "APOP" Digest Parameter Buffer Overflow
Vulnerability

SECUNIA ADVISORY ID:
SA11029

VERIFY ADVISORY:
http://secunia.com/advisories/11029/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
1st Class Mail Server 4.x

DESCRIPTION:
JeFFOsZ has discovered a vulnerability in 1st Class Mail Server,
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to a boundary error in "mailsrv.dll"
within the "APOP" argument handling. This can be exploited to cause a
buffer overflow by passing an overly long (about 626 bytes) digest
parameter to the "APOP" command.

The vulnerability has been confirmed in version 4.0.

SOLUTION:
Restrict access to the POP3 service (port 110/TCP).

Use another product.

PROVIDED AND/OR DISCOVERED BY:
JeFFOsZ

ORIGINAL ADVISORY:
http://www.digiti.be/jeffosz/advisories/1stclasspop3.txt

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