Microsoft Services for Unix (SFU) RPC parameter size buffer overflow could crash the server

sfu-rpc-parameter-bo (10258) The risk level is classified as LowLow Risk


The RPC server in Microsoft Services for Unix (SFU) is vulnerable to a denial of service attack, caused by a buffer overflow. By sending fragmented RPC packets with incorrect parameter sizes to the RPC server on TCP port 111, a remote attacker could overflow a buffer and cause the RPC server to crash. The server must be restarted to regain normal functionality.


Denial of Service


Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS02-057. See References.


  • Microsoft Security Bulletin MS02-057: Flaw in Services for Unix 3.0 Interix SDK Could Allow Code Execution (Q329209).
  • BID-5879: Microsoft Malformed RPC Packet Buffer Overflow Vulnerability
  • CVE-2002-1140: The Sun Microsystems RPC library Services for Unix 3.0 Interix SD, as implemented on Microsoft Windows NT4, 2000, and XP, allows remote attackers to cause a denial of service (service hang) via malformed packet fragments, aka Improper parameter size check leading to denial of service.
  • OSVDB ID: 14497: Microsoft Services for Unix RPC Library Malformed Packet Fragment DoS
  • US-CERT VU#840137: Microsoft Services for Unix 3.0 Interix SDK vulnerable to buffer overrun via RPC request containing improper parameter size check

Platforms Affected:

  • Microsoft Windows Services for UNIX 3.0


Oct 02, 2002

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