Novell Netware XNFS caller_name xdrDecodeString Remote Code Execution VulnerabilityZDI-12-011: January 10th, 2012
TippingPoint™ IPS Customer ProtectionTippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11929. For further product information on the TippingPoint IPS:
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.
Vendor ResponseNovell has issued an update to correct this vulnerability. More details can be found at:
2011-06-03 - Vulnerability reported to vendor
2012-01-10 - Coordinated public release of advisory
CreditThis vulnerability was discovered by:
Francis Provencher for Protek Research Lab's