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

Description:

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.


Consequences:

Denial of Service

Remedy:

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

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

Reported:

Oct 02, 2002

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