Zero-Day Advisory

Fortinet Discovers Corel WordPerfect Memory Corruption Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered a Memory Corruption vulnerability in Corel WordPerfect 2020.


Corel WordPerfect is a Commercial Word Processing Tool by Corel. It allows the user to create resumes, reports, presentations & more. It introduces the latest version of the office suite supporting everyday work needs - from crafting documents and presentations, to creating impressive spreadsheets. Users can publish their eBooks, edit a PDF, import or export files in 60+ different formats, and more.


A memory corruption vulnerability has been discovered in Corel WordPerfect 2020. The vulnerability is caused by a crafted "DOC" file which causes an out-of-bounds memory access. It could allow malicious users to gain sensitive information.

Solutions

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

Corel.WordPerfect.CVE-2021-38108.Memory.Corruption
Released May 19, 2021

No solution has been provided by the vendor.

Timeline

Fortinet reported the vulnerability to Corel on March 4, 2021.

Fortinet requested (First Notice) for an update on March 9, 2021.

Fortinet requested (Second Notice) for an update on March 22, 2021.

Fortinet requested (Third & Final Notice) for an update on April 5, 2021.

Corel responded and acknowledged receipt of vulnerability on April 12, 2021.

Fortinet requested for an update on May 12, 2021.

Fortinet requested for an update on May 21, 2021.

Fortinet requested for an update on July 15, 2021.

Fortinet notified the vendor with intent to Publish 0-Day Vulnerability Advisory and/or Blog on September 21, 2021.

Fortinet releases advisory on September 29, 2021.

Acknowledgement

This vulnerability was discovered by Kushal Arvind Shah 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.