CVE-2009-0836 in Foxitsoftware
Summary
by MITRE
Foxit Reader 2.3 before Build 3902 and 3.0 before Build 1506, including 1120 and 1301, does not require user confirmation before performing dangerous actions defined in a PDF file, which allows remote attackers to execute arbitrary programs and have unspecified other impact via a crafted file, as demonstrated by the "Open/Execute a file" action.
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Analysis
by VulDB Data Team • 05/17/2025
The vulnerability identified as CVE-2009-0836 represents a critical security flaw in Foxit Reader versions 2.3 prior to Build 3902 and 3.0 prior to Build 1506, including specific builds 1120 and 1301. This issue stems from the software's insufficient user interaction requirements when processing PDF files containing malicious actions. The flaw operates at the core of PDF processing functionality where the application fails to implement proper user consent mechanisms before executing potentially harmful operations. This vulnerability is particularly dangerous because it allows remote attackers to craft malicious PDF files that can automatically perform dangerous system operations without any user awareness or approval, creating an environment where unauthorized code execution becomes possible through seemingly legitimate document interactions.
The technical implementation of this vulnerability lies in the PDF processing engine's handling of specific action types within PDF files. When a PDF document contains actions such as "Open/Execute a file" or similar dangerous operations, the Foxit Reader application does not prompt users for confirmation before executing these actions. This behavior directly violates security best practices for document processing applications and creates an attack surface where malicious actors can exploit the lack of user interaction requirements. The vulnerability is classified under CWE-1004 which addresses the issue of insufficient user interaction requirements for dangerous actions, making it particularly susceptible to automated exploitation. The flaw operates at the application layer where PDF parsing and execution occur, bypassing normal security controls that would typically require user consent for file operations.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential system compromise and data exposure. Remote attackers can craft malicious PDF files that automatically execute arbitrary programs on vulnerable systems, potentially leading to full system compromise. The unspecified other impacts mentioned in the vulnerability description suggest that the consequences could include data theft, privilege escalation, or additional system instability. This vulnerability aligns with ATT&CK technique T1064 which involves creating or modifying files to execute code, and T1204.002 which addresses user execution of malicious files. The attack vector is particularly concerning because it leverages social engineering through document sharing, making it difficult for users to distinguish between legitimate and malicious PDF files. Organizations using affected versions of Foxit Reader face significant risk exposure, particularly in environments where users frequently open PDF documents from untrusted sources.
Mitigation strategies for CVE-2009-0836 require immediate action to address the core issue of insufficient user interaction requirements. The primary recommendation involves upgrading to a patched version of Foxit Reader that implements proper user confirmation mechanisms for dangerous PDF actions. System administrators should implement strict document handling policies that restrict PDF file access to trusted sources and consider deploying sandboxing solutions for PDF processing. Network-level controls such as PDF file filtering and content inspection can provide additional protection layers. Organizations should also conduct security awareness training to educate users about the risks of opening PDF files from unknown sources. The vulnerability demonstrates the importance of implementing defense-in-depth strategies where multiple security controls work together to protect against document-based attacks. Regular security assessments and vulnerability scanning should be conducted to ensure that all PDF processing applications maintain current security configurations and that users are protected against similar vulnerabilities in other software components.