Fortinet Discovers Microsoft Graphics Memory Corruption Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a Memory Corruption vulnerability in Microsoft Windows font library.

Windows font library supports many font formats. Each font format contains many thousands of characters. The vulnerable Windows font library is used by many Windows platforms.

The Memory Corruption vulnerability exists when the Windows font library improperly handles a specially crafted EOT file. An attacker who successfully exploited this vulnerability could take control of the affected system.

Solutions

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

MS.Windows.Graphics.EOT.File.Parsing.Code.Execution
Released Oct 09, 2017

Users should apply the solution provided by Microsoft.

Timeline

Fortinet reported the vulnerability to Microsoft on July 11, 2017.

Microsoft patched the vulnerability on October 10, 2017.

Acknowledgement

This vulnerability was discovered by Wayne Low of Fortinet's FortiGuard Labs.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11763
• CVE-2017-11763

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.