Title: Microsoft Windows NNTP Denial of Service Vulnerability
Severity: MODERATE
Description:
Network News Transfer Protocol (NNTP) service is a protocol used to process posting, distributing, searching and archiving news articles posted to Usenet newsgroups. NNTP runs by default if Windows NT 4.0 Option Pack or Windows 2000 server is installed. It is not installed on default installations of Windows NT 4.0 and Windows 2000 Professional.
Due to a flaw in the Microsoft NNTP service, it is possible for a host to be led to consume all available memory resources. This behaviour is the result of flaws in the server's memory management.
Malformed news postings submitted repeatedly to an affected host, will result in the accumulation of allocated memory that is not freed after use. It is possible to exhaust the memory resources of the target system, potentially impacting the NNTP service and other applications running on the affected host.
A restart is required in order to gain normal functionality.
Affected Products:
- Avaya DefinityOne Media Servers
- Avaya IP600 Media Servers
- Avaya S3400 Message Application Server
- Avaya S8100 Media Servers
- Microsoft Exchange Server 2000
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Advanced Server SP1
- Microsoft Windows 2000 Advanced Server SP2
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Server SP1
- Microsoft Windows 2000 Server SP2
- Microsoft Windows NT 4.0 Option Pack
References:
- Microsoft: Microsoft Security Bulletin MS01-043
- Microsoft: Microsoft Technet Security
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