Title: Microsoft Windows NT RPC Endpoint Mapper Denial of Service Vulnerability
Severity: MODERATE
Description:
Remote Procedure Call (RPC) services are typically used by distributed applications such as SQL server and Exchange server. RPC services are assigned TCP and UDP ports dynamically. The RPC Endpoint Mapper service provides a mapping between RPC services and their currently assigned ports. Therefore, when a client requires access to a service using RPC, it must first request a port mapping from the RPC Endpoint Mapper, then it communicates directly with the service.
When the RPC Endpoint Mapper, which typically resides on port 135, is sent a particular type of malformed data, it can cause the service to fail. This will cause all client attempts to communicate with RPC services on the target host to fail, resulting in a denial of services.
The service can be restored to normal operation after a reboot of the server.
Affected Products:
- Avaya DefinityOne Media Servers
- Avaya IP600 Media Servers
- Avaya S8100 Media Servers
- Microsoft Windows NT Enterprise Server 4.0
- Microsoft Windows NT Enterprise Server 4.0 SP1
- Microsoft Windows NT Enterprise Server 4.0 SP2
- Microsoft Windows NT Enterprise Server 4.0 SP3
- Microsoft Windows NT Enterprise Server 4.0 SP4
- Microsoft Windows NT Enterprise Server 4.0 SP5
- Microsoft Windows NT Enterprise Server 4.0 SP6
- Microsoft Windows NT Enterprise Server 4.0 SP6a
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Server 4.0 SP1
- Microsoft Windows NT Server 4.0 SP2
- Microsoft Windows NT Server 4.0 SP3
- Microsoft Windows NT Server 4.0 SP4
- Microsoft Windows NT Server 4.0 SP5
- Microsoft Windows NT Server 4.0 SP6
- Microsoft Windows NT Server 4.0 SP6a
- Microsoft Windows NT Terminal Server 4.0
- Microsoft Windows NT Terminal Server 4.0 SP1
- Microsoft Windows NT Terminal Server 4.0 SP2
- Microsoft Windows NT Terminal Server 4.0 SP3
- Microsoft Windows NT Terminal Server 4.0 SP4
- Microsoft Windows NT Terminal Server 4.0 SP5
- Microsoft Windows NT Terminal Server 4.0 SP6
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Workstation 4.0 SP1
- Microsoft Windows NT Workstation 4.0 SP2
- Microsoft Windows NT Workstation 4.0 SP3
- Microsoft Windows NT Workstation 4.0 SP4
- Microsoft Windows NT Workstation 4.0 SP5
- Microsoft Windows NT Workstation 4.0 SP6
- Microsoft Windows NT Workstation 4.0 SP6a
References:
- Microsoft: Microsoft Security Bulletin MS01-048
- Microsoft: Q305399 - Malformed Request to RPC Endpoint Mapper can Cause RPC Service to Fail
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