Zero-Day Advisory

Fortinet Discovers EMC NetWorker nsrexecd.exe Malicious Array Count Denial of Service Vulnerability


Fortinet's FortiGuard Labs has discovered malicious array count denial of service vulnerability in EMC NetWorker nsrexecd.exe.


FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

Released Oct 03, 2008
Use the solution provided by EMC.

Additional Information

The RPC interface used by the affected EMC products does not properly enforce bounds checking on a parameter which is used to allocate memory on the heap. The vulnerable NetWorker products use the process "nsrexecd.exe". A remote attacker can exploit this by repeatedly sending requests to the RPC interface, each time allocating more and more memory. Eventually system resources will be exhausted, and denial of service is achieved.


Zhenhua Liu, Xiaopeng Zhang and Junfeng Jia of Fortinet's FortiGuard Global Security Research Team

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.