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securityvulnsSecurityvulnsSECURITYVULNS:DOC:2023
HistorySep 11, 2001 - 12:00 a.m.

Security Bulletin MS01-048

2001-09-1100:00:00
vulners.com
18

Title: Malformed Request to RPC Endpoint Mapper can Cause RPC
Service to Fail
Date: 10 September 2001
Software: Microsoft(r) Windows NT(r) 4.0
Impact: Denial of service
Bulletin: MS01-048

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-048.asp.


Issue:

The RPC endpoint mapper allows RPC clients to determine the port
number currently assigned to a particular RPC service. The Windows NT
4.0 endpoint mapper contains a flaw that causes it to fail upon
receipt of a request that contains a particular type of malformed
data.

Because the endpoint mapper runs within the RPC service itself,
exploiting this vulnerability would cause the RPC service itself to
fail, with the attendant loss of any RPC-based services the server
offers, as well as potential loss of some COM functions. Normal
service could be restored by rebooting the server.

Mitigating Factors:

  • Standard security recommendations call for port 135 - the port
    on which the RPC endmapper operates - to be blocked at the
    firewall. If this were done, Internet-based attackers would not
    be able to exploit this vulnerability.

Patch Availability:

Acknowledgment:


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ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE
FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN
IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.