CVE-2020-10908 in PhantomPDF
Summary
by MITRE
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PhantomPDF 9.7.0.29478. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of the Export command of the communication API. The issue results from the lack of proper validation of user-supplied data, which can result in a type confusion condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-9865.
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Analysis
by VulDB Data Team • 05/06/2026
CVE-2020-10908 represents a critical type confusion vulnerability in Foxit PhantomPDF version 9.7.0.29478 that enables remote code execution through improper input validation within the communication API's Export command. This vulnerability falls under CWE-415, which describes improper handling of type confusion conditions that can lead to arbitrary code execution. The flaw specifically manifests when the application processes user-supplied data during the Export command execution, failing to validate the data type and content properly. The type confusion occurs because the application incorrectly handles memory operations when processing structured data, allowing an attacker to manipulate the data flow and potentially overwrite critical memory regions. This vulnerability requires user interaction to exploit, meaning a target must either visit a malicious webpage or open a specially crafted malicious file that triggers the vulnerable Export functionality. The attack vector typically involves embedding malicious code within PDF documents or web content that, when processed by the vulnerable PDF reader, triggers the type confusion condition. When executed, this vulnerability allows an attacker to run arbitrary code within the context of the current process, potentially escalating privileges and gaining full control over the affected system. The vulnerability's impact extends beyond simple code execution as it can be leveraged for privilege escalation and persistence mechanisms, making it particularly dangerous in enterprise environments where PDF processing is common. According to ATT&CK framework, this vulnerability maps to T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, demonstrating how the initial code execution can be used to establish more persistent footholds. The exploitation process involves crafting malicious input that confuses the type handling mechanism, leading to memory corruption that can be controlled by an attacker to redirect program execution flow. Organizations should prioritize patching this vulnerability immediately, as it represents a significant risk to systems that process PDF documents regularly. The vulnerability's remote nature makes it particularly attractive to threat actors who can deliver malicious payloads through web-based attacks, phishing campaigns, or compromised websites that serve malicious PDF content. Security teams should implement network monitoring to detect suspicious PDF processing activities and consider implementing application whitelisting policies to prevent execution of untrusted PDF content. The vulnerability highlights the importance of proper input validation and type safety in software development, particularly for applications that handle complex data formats like PDF documents. Organizations should also consider deploying sandboxing solutions for PDF processing and implementing multi-layered security controls to mitigate the risk of exploitation. Given the vulnerability's classification and the potential for remote code execution, it represents a high-priority threat that requires immediate attention from security operations teams to prevent potential compromise of sensitive systems and data.