Zero-Day Advisory

Fortinet Discovers Foxit Reader and PhantomPDF Heap Overflow Vulnerability


Fortinet's FortiGuard Labs has discovered a heap overflow vulnerability in Foxit Reader and PhantomPDF.
Foxit Reader is a small, lightning fast, and feature rich PDF viewer which allows users to create, open, view, sign, and print any PDF file. Foxit Reader is built upon the industry's fastest and most accurate PDF rendering engine, providing users with the best PDF viewing and printing experience.

Foxit PhantomPDF is the industry's premiere PDF editor; making editing PDF files easier than ever before to deliver professional looking PDF documents in no time at all. Its PDF editing capabilities provide capabilities similar to that of word processing software. The PDF editor automatically identifies text boxes and allows users to paragraph edit within that text box.

The discovered vulnerability is caused due to insufficient validation of
Bezier data when Foxit Reader and PhantomPDF parse a malformed PDF file. Attackers could exploit this vulnerability to cause a denial of service (memory corruption) or potentially execute arbitrary code.


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

Released Apr 19, 2016

Users should apply the solution provided by Foxit.


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.