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Multiple Buffer Overflow Vulnerabilities Found in MERCUR Mail Server

SUMMARY

<http://atrium-softwareusa.com/EN/mercur_products.html&gt; Mercur Mail
Server is a fully compliant POP3, SMTP, IMAP4 mail server that offers
business and individual users a level stability, security, and scalability
not matched by other mail server products. It supports unlimited domains
and user accounts. Multiple buffer overflow vulnerabiltiies have been
found in the product, allowing attackers to cause the server to crash.

DETAILS

Vulnerable systems:

• MERCUR IMAP4-Server version 4.02.09

Immune systems:

• MERCUR IMAP4-Server version 4.2.15.0

Whenever a malicious attacker sends a large of data with any of these
commands: EXAMINE, DELETE, SUBSCRIBE, RENAME, UNSUBSCRIBE, LIST, LSUB,
STATUS, LOGIN, CREATE, SELECT, a buffer will overflow, causing the server
to crash (Sending more than 8000 characters will not cause any effect as
the service will stop the request from overflow the buffer).

Vendor response:
Dear Dennis,
Our programmers informed us that they have fixed the problem and now they
are testing it. I will inform you when a fix is available, it should be
soon. Thank you for pointing out this problem to us.
Sincerely,
Alex Ribeiro

Disclosure timeline:
10/05/2003 Found the Vulnerability, and made an analysis.
13/05/2003 Reported to Vendor.
14/05/2003 Recived information from Vendor
06/06/2003 Public Disclosure

ADDITIONAL INFORMATION

The information has been provided by
<mailto:[email protected]> NC Agent.

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