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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0217
Novell Netware RPC XNFS xdrDecodeString Remote Code Execution Vulnerability
                             24 February 2011

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Novell Netware
Publisher:         Zero Day Initiative
Operating System:  Netware
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-4227  

Original Bulletin: 
   http://www.zerodayinitiative.com/advisories/ZDI-11-090/

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Novell Netware RPC XNFS xdrDecodeString Remote Code Execution Vulnerability
ZDI-11-090: February 18th, 2011

CVE ID

      CVE-2010-4227 

CVSS Score

      10, (AV:N/AC:L/Au:N/C:C/I:C/A:C) 

Affected Vendors

      Novell

Affected Products

      Netware

TippingPoint IPS Customer Protection
TippingPoint IPS customers are protected against this vulnerability by Digital 
Vaccine protection filter ID 10874. For further product information on the 
TippingPoint IPS:

      http://www.tippingpoint.com 

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of Novell Netware. Authentication is not required to 
exploit this vulnerability.

The flaw exists within the XNFS.NLM component which listens by default on UDP 
port 1234. When handling the an NFS RPC request the xdrDecodeString function 
uses a user supplied length value to null terminate a string. This value can be 
signed allowing the NULL byte to be written at an arbitrary address. A remote 
attacker can exploit this vulnerability to execute arbitrary code under the 
context of the system.

Vendor Response

Novell has issued an update to correct this vulnerability. More details can be found at:

      http://download.novell.com/Download?buildid=1z3z-OsVCiE~

Disclosure Timeline

      2010-08-25 - Vulnerability reported to vendor
      2011-02-18 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:

      Francis Provencher for Protek Researchh Lab's

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