Multiple vulnerabilities in Nitro Pro PDF reader

Multiple vulnerabilities in Nitro Pro PDF reader

Cisco Talos researchers discovered these vulnerabilities. Blog by Jon Munshaw.

Cisco Talos recently discovered multiple code execution vulnerabilities in the Nitro Pro PDF reader. Nitro PDF allows users to save, read, sign and edit PDFs on their computers. The software contains vulnerabilities that could allow adversaries to exploit a victim machine in multiple ways that would eventually allow them to execute code.

In accordance with our coordinated disclosure policy, Cisco Talos worked with Nitro Pro to ensure that these issues are resolved and that an update is available for affected customers.

Vulnerability details


Nitro Pro Indexed ColorSpace rendering code execution vulnerability (TALOS-2020-1070/CVE-2020-6116)


An arbitrary code execution vulnerability exists in the rendering functionality of Nitro Software, Inc.'s Nitro Pro 13.13.2.242. When drawing the contents of a page using colors from an indexed colorspace, the application can miscalculate the size of a buffer when allocating space for its colors. When using this allocated buffer, the application can write outside its bounds and cause memory corruption which can lead to code execution. A specially crafted document must be loaded by a victim in order to trigger this vulnerability.


Read the complete vulnerability advisory here for additional information. 


Nitro Pro PDF ICCBased ColorSpace stroke color code execution vulnerability (TALOS-2020-1084/CVE-2020-6146)


An exploitable code execution vulnerability exists in the rendering functionality of Nitro Pro 13.13.2.242 and 13.16.2.300. When drawing the contents of a page and selecting the stroke color from an "ICCBased" colorspace, the application will read a length from the file and use it as a loop sentinel when writing data into the member of an object. Due to the object member being a buffer o ..