CVE-2022-43649 in Foxit
Summary
by MITRE • 03/29/2023
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader 12.0.2.12465. 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 Annotation objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-19478.
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Analysis
by VulDB Data Team • 04/20/2023
The vulnerability identified as CVE-2022-43649 represents a critical remote code execution flaw in Foxit PDF Reader version 12.0.2.12465 that demonstrates a classic object validation error pattern commonly found in software security implementations. This vulnerability falls under the category of improper input validation as classified by CWE-20, where the application fails to properly verify the existence or integrity of objects before attempting operations on them. The flaw specifically manifests within the Annotation object handling mechanism, which is a fundamental component of PDF document processing that allows for interactive elements such as comments, highlights, and form fields to be embedded within documents. When a malicious PDF file contains specially crafted Annotation objects that reference non-existent or improperly structured data, the PDF reader's processing engine attempts to operate on these invalid objects without proper validation checks.
The exploitation of this vulnerability requires user interaction through either visiting a malicious webpage that hosts a crafted PDF document or opening a malicious file directly, making it a typical example of a client-side attack vector that aligns with ATT&CK technique T1203. The root cause of the vulnerability stems from the absence of proper null pointer or object existence validation within the PDF parsing logic, allowing an attacker to craft malicious documents that trigger buffer overflows, memory corruption, or other exploitable conditions when the reader attempts to process the Annotation objects. This type of vulnerability represents a privilege escalation risk as the malicious code executes within the context of the currently running PDF reader process, potentially with the same privileges as the user who opened the document. The security implications extend beyond simple code execution to include potential information disclosure, system compromise, and lateral movement capabilities within a compromised environment.
The operational impact of this vulnerability is significant for organizations that rely on Foxit PDF Reader for document processing, as it creates an attack surface that can be exploited through various delivery mechanisms including phishing emails, compromised websites, or malicious file transfers. The vulnerability's classification as a remote code execution flaw means that attackers do not require physical access to target systems, making it particularly dangerous in enterprise environments where users frequently interact with untrusted PDF documents. The specific nature of the flaw in Annotation object handling suggests that any PDF document containing malicious annotations could potentially trigger the vulnerability, regardless of the document's intended purpose or content. Organizations should consider this vulnerability in the context of their broader security posture, particularly in relation to email filtering, web proxy configurations, and endpoint protection measures that may need to be enhanced to prevent exploitation. The vulnerability also highlights the importance of keeping PDF reader software updated, as the issue was present in version 12.0.2.12465 and likely affected previous versions as well.
Mitigation strategies for this vulnerability should include immediate patching of Foxit PDF Reader to the latest version that addresses the specific Annotation object validation issue, while also implementing network-level controls such as PDF file filtering and web content filtering to prevent users from accessing potentially malicious documents. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized PDF readers, and establish user awareness training programs to educate staff about the risks of opening untrusted PDF files. From a defensive perspective, the vulnerability demonstrates the importance of robust input validation and object existence checking within parsing libraries, and organizations should review their own software development practices to ensure similar flaws are not present in their applications. The ATT&CK framework suggests that organizations should implement detection capabilities for suspicious PDF file characteristics and monitor for unusual process behavior that might indicate exploitation attempts. Additionally, security teams should consider deploying sandboxing solutions that can analyze PDF documents in isolated environments before allowing them to be opened by end users, providing an additional layer of protection against vulnerabilities like CVE-2022-43649 that can be exploited through seemingly benign document formats.