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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2007-0132
Microsoft Windows RPC Authentication Denial of Service Vulnerability

Original Issue Date:October 10, 2007

Severity Rating: MEDIUM

Systems Affected

  • Microsoft Windows Server 2003 Datacenter Edition
  • Microsoft Windows Server 2003 Enterprise Edition
  • Microsoft Windows Server 2003 Standard Edition
  • Microsoft Windows Server 2003 Web Edition
  • Microsoft Windows Storage Server 2003
  • Microsoft Windows Vista
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional

    • Overview

    A vulnerability has been reported in Microsoft Windows RPC Remote Procedure Call authentication service that could be exploited by an attacker to cause Denial of Service on the vulnerable system.

    Description

    To complete any remote procedure call, all distributed applications must create a binding between the client and the server. Microsoft RPC provides multiple levels of authentication. Depending on the authentication level, the origin of the traffic which security principal sent the traffic can be verified when the connection is established.

    The NTLM Security Support Provider service provides security to RPC programs that use transports other than named pipes.

    The vulnerability is caused due to an error while processing RPC authentication requests. Specially crafted packets using the NTLMSSP authentication can cause the RPC service to fail in such a way that could cause vulnerable system to restart.

    The attacker could exploit this vulnerability by creating specially crafted RPC message and sending it to vulnerable system over an affected TCP/UDP port. These crafted messages could then cause the RPCSS service to stop responding and cause the vulnerable system to stop responding.

    Workaround

    • Block TCP/UDP ports 135,137,138 and 445 at the firewall If not required.
    • Use personal firewall
      Enable TCP/IP filtering on the systems.
    • Block the affected ports by using IPSec on the affected system

    Solution

    Apply appropriate patches as mentioned in Microsoft Security Bulletin MS07-058

    Vendor Information

    Microsoft
    http://www.microsoft.com/technet/security/Bulletin/MS07-058.mspx

    References

    Microsoft
    http://www.microsoft.com/technet/security/Bulletin/MS07-058.mspx

    Secunia
    http://secunia.com/advisories/27134/

    CVE Name
    CVE-2007-2228

    Disclaimer

    The information provided herein is on "as is" basis, without warranty of any kind.

    Contact Information

    Email: info@cert-in.org.in
    Phone: +91-11-2436857

    Postal address

    Indian Computer Emergency Response Team (CERT-In)
    Ministry of Electronics and Information Technology
    Government of India
    Electronics Niketan
    6, CGO Complex, Lodhi Road,
    New Delhi - 110 003
    India

     
    Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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