Zero-Day Advisory

Fortinet Discovers Apple QuickTime 3gp File 'stsz' Atom Handling Memory Corruption Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a memory corruption vulnerability in Apple QuickTime.
QuickTime is an extensible multimedia framework developed by Apple Inc., capable of handling various formats of digital video, picture, sound, panoramic images and interactivity. The classic version of QuickTime is available for Windows XP and later, as well as Mac OS X Leopard and later operating systems.
This vulnerability is caused due to insufficient validation of the value of 'sample_size' field in 'stsz' atom when parsing 3gp file. It may lead to an unexpected application termination or arbitrary code execution.

Solutions

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

Apple.QuickTime.3gp.File.stsz.Atom.Handling.Memory.Corruption
Released Aug 19, 2015
Users should apply the solution provided by Apple.

References

• http://www.apple.com/quicktime/
  http://support.apple.com/kb/HT1222
  https://support.apple.com/en-us/HT205046
• CVE-2015-5785

Acknowledgement

This vulnerability was discovered by Kai Lu 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.