Zero-Day Advisory

Fortinet Discovers RealNetworks IVR File Processing Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered file processing vulnerability in RealNetworks IVR.

Solutions

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

RealNetworks.RealPlayer.IVR.File.Processing.Code.Execution
Released Aug 10, 2008
Users should apply the solution provided by RealNetworks.

Additional Information

Internet Video Recording (IVR) files contain media content that is played and recorded by RealPlayer. A remote attacker could craft a malicious IVR file, that when sent to an unsuspecting user, may allow the execution of arbitrary code when viewed, using one of two vulnerabilities during RealPlayer's IVR processing routine:
1) A heap corruption vulnerability that occurs when altering a field that determines the length of a structure.
2) A vulnerability that allows an attacker to write one null byte to an arbitrary memory address by using an overly long file name length value.

It should be noted that the victim does not necessarily have to open the malicious file for exploitation to occur: the vulnerabilities lie in a DLL that is also used as a plugin for the Windows Explorer shell. A successful attack could take place by merely previewing the IVR file through Windows Explorer.

Acknowledgement

Haifei Li 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.