Zero-Day Advisory

Fortinet Discovers Microsoft Windows Server iSNS Server Service Memory Corruption Vulnerability


Fortinet's FortiGuard Labs has discovered a memory corruption vulnerability in iSNS Server service running on Microsoft Windows Server.
The Internet Storage Name Service (iSNS) protocol is used for interaction between iSNS servers and iSNS clients. iSNS clients are computers that are attempting to discover storage devices on an Ethernet network. iSNS servers provide intelligent storage discovery and management services, allowing a commodity IP network to function in a similar capacity as a storage area network. iSNS facilitates a seamless integration of IP networks and manages iSCSI devices. iSNS thereby provides value in any storage network comprised of iSCSI devices.
The memory corruption vulnerability exists due to insufficient validation of inputs in the iSNS Server service. An attacker may be able to exploit this to execute arbitrary code within the context of the SYSTEM account, via a crafted network packet.


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

Released Mar 15, 2017

Users should apply the solution provided by Microsoft.

Additional Information

Following products are affected by the vulnerability.

Windows Server 2008 for 32-bit Systems Service Pack 2 

Windows Server 2008 for x64-based Systems Service Pack 2 

Windows Server 2008 R2 for x64-based Systems Service Pack 1 

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 

Windows Server 2012 

Windows Server 2012 R2

Windows Server 2016 for x64-based Systems


This vulnerability was discovered by Honggang Ren of Fortinet's FortiGuard Labs.

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.