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Synopsis
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NoticeWare Email Server NG 4.6.2 is vulnerable to denial-of-service  
(DoS) attacks.
The IMAP server crashes after receiving several large LOGIN messages.
Product: NoticeWare Email Server NG
Version: 4.6.3 and probably the older versions
Vendor: NoticeWare Corporation (www.noticeware.com)
Type: Denial-of-service
Risk: service disruption
Remote: Yes
Discovered by: Joćo Antunes (AJECT -- Attack Injection Tool) on 04/Jun/ 
2008
Exploit: Not Available
Solution: Not Available
Status: Developers were contacted and corrected the software in  
version 5.1


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Vulnerability Description
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The vulnerability can be triggered by sending over 40 LOGIN messages  
to the imap server:
A001 LOGIN Ax5000 AAAAA

Depending on the number of repeated messages (probably related to the  
server resources) this will crash the server. Successful exploitation  
results in a remote denial of service.