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ESB-2009.1360 - [Netware] NFS Portmapper & RPC Module: Execute arbitrary code/commands - Remote/unauthenticated

Date: 01 October 2009

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1360
         ZDI-09-067: Novell NetWare NFS Portmapper and RPC Module
                       Stack Overflow Vulnerability
                              1 October 2009

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

Product:           NFS Portmapper
                   RPC Module
Publisher:         Zero Day Initiative
Operating System:  Netware
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 
   http://www.zerodayinitiative.com/advisories/ZDI-09-067/

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Novell NetWare NFS Portmapper and RPC Module Stack Overflow Vulnerability
ZDI-09-067: September 30th, 2009
CVE ID

Affected Vendors

      Novell

Affected Products

      Netware

TippingPoint IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by 
Digital Vaccine protection filter ID 8280. 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 NFS Portmapper daemon. 
Authentication is not required to exploit this vulnerability.

The specific flaw exists within the processing of CALLIT RPC calls. The 
vulnerable daemon explicitly trusts a length field when receiving data 
which is later copied into a stack buffer, potentially resulting in a stack 
overflow. Successful exploitation of this vulnerability can lead to remote 
code execution under the context of the daemon.

Vendor Response

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

      http://download.novell.com/Download?buildid=DNxmXuyVPuY~

Disclosure Timeline

      2009-06-23 - Vulnerability reported to vendor
      2009-09-30 - Coordinated public release of advisory

Credit

This vulnerability was discovered by:

      Nick DeBaggis

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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