Title: Services for Unix 2.0 Telnet and NFS Services Contain
Memory Leaks
Date: 23 July 2001
Software: Services for Unix 2.0
Impact: Denial of service
Bulletin: MS01-039

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-039.asp.

Issue:

Among the components provided by Services for Unix (SFU) 2.0 are
services that implement the NFS (Network File System) and Telnet
protocols. Both services contain memory leaks that could be triggered
by a user request. An attacker who repeatedly sent such a request
could
deplete the kernel memory on the server to the point where
performance
slowed and the system could potentially fail.

Mitigating Factors:

• Only the implementations provided in SFU 2.0 are affected.
  In particular, the Telnet services provided in Windows NT(r) 4.0
  and Windows(r) 2000 are not affected by the vulnerability.
• There is no capability via the vulnerability to usurp any
  administrative control over the server or compromise any
  data on it.

Patch Availability:

• A patch is available to fix this vulnerability. Please read the
  Security Bulletin
  http://www.microsoft.com/technet/security/bulletin/ms01-039.asp
  for information on obtaining this patch.

Acknowledgment:

• Peter Grundl

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