Advisory Details

January 10th, 2012

Novell Netware XNFS caller_name xdrDecodeString Remote Code Execution Vulnerability

ZDI-12-011
ZDI-CAN-1206

CVE ID
CVSS SCORE 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Novell
AFFECTED PRODUCTS Netware
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11929. 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 is used when handling NFS RPC requests. This process listens on UDP port 32779. When decoding the xdr encoded caller_name from an NLM_TEST procedure request the process uses the user supplied length as the bounds for its copy to a stack buffer. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the system.

ADDITIONAL DETAILS Novell has issued an update to correct this vulnerability. More details can be found at:
http://download.novell.com/Download?buildid=Cfw1tDezgbw~
DISCLOSURE TIMELINE
  • 2011-06-03 - Vulnerability reported to vendor
  • 2012-01-10 - Coordinated public release of advisory
CREDIT Francis Provencher for Protek Research Lab's
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