Zero-Day Advisory

Fortinet Discovers MSRawImage Store Uncomrpessed DNG Out-of-bound Write Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered out-of-bounds memory write vulnerability in Microsoft Raw Image Extension.

The Raw Image Extension adds native viewing support for images captured in raw file formats produced by many mid- to high-end digital cameras

The out-of-bounds memory write vulnerability exists due to unsanitized user-controlled data crafted in a raw image file parsed by a vulnerable component. An attacker who successfully exploited the vulnerability could obtain remote code execution on the user's system.

Solutions

Users should apply the solution provided by Microsoft.

Timeline

Fortinet reported the vulnerability to Microsoft on March 30, 2021

Microsoft confirmed the vulnerability on April 01, 2021

Microsoft released a patch for the vulnerability on July 13, 2021

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34521
  

• CVE-2021-34521

Acknowledgement

This vulnerability was discovered by Wayne Low 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.