CVE-2022-42409 in PDF-XChange Editor
Summary
by MITRE • 01/26/2023
This vulnerability allows remote attackers to disclose sensitive information on affected installations of PDF-XChange Editor. 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 parsing of PDF files. Crafted data in a PDF file can trigger a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-18315.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42409 represents a critical buffer over-read vulnerability affecting PDF-XChange Editor software that enables remote information disclosure and potential arbitrary code execution. This vulnerability resides within the PDF file parsing component of the application, specifically when processing malformed PDF content that triggers a read past the end of an allocated buffer. The flaw manifests during the parsing of PDF files where crafted data can cause the application to access memory locations beyond the intended buffer boundaries, potentially exposing sensitive information from adjacent memory segments.
The vulnerability requires user interaction to be exploited effectively, meaning that an attacker must convince a target to visit a malicious webpage or open a specially crafted PDF file containing the malicious payload. This user interaction requirement aligns with common attack vectors in the software exploitation landscape where social engineering plays a crucial role in successful compromise. The technical nature of this flaw places it squarely within the category of buffer over-read vulnerabilities, which are classified under CWE-125 as "Out-of-bounds Read" and are commonly exploited in privilege escalation and information disclosure scenarios.
From an operational impact perspective, this vulnerability creates significant security risks for organizations relying on PDF-XChange Editor for document processing and viewing. The potential for remote code execution in the context of the current process means that successful exploitation could allow attackers to gain full control over the affected system, particularly when combined with other vulnerabilities in a multi-stage attack approach. The buffer over-read condition can lead to information disclosure that may reveal memory contents including sensitive data, cryptographic keys, or application state information that could be leveraged for further exploitation.
The attack surface for this vulnerability extends across organizations that utilize PDF-XChange Editor in their document workflows, particularly those in sectors handling sensitive information such as financial services, government agencies, and healthcare organizations. The vulnerability's classification under ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" and T1203 for "Exploitation for Client Execution" indicates that attackers could leverage this flaw as part of broader attack chains involving command execution and privilege escalation. Organizations should consider implementing network-based detection measures and monitoring for suspicious PDF file access patterns, as well as ensuring timely patch deployment to mitigate the risk of exploitation.
Security practitioners should prioritize patch management for this vulnerability, as the ZDI-CAN-18315 identifier indicates that this issue was recognized and addressed by the Zero Day Initiative. The vulnerability's potential for remote code execution combined with its requirement for user interaction makes it particularly dangerous in targeted attack scenarios where attackers can craft convincing phishing campaigns to deliver malicious PDF content. Additionally, organizations should implement application whitelisting policies and restrict PDF file handling capabilities where possible, while also conducting regular security assessments to identify systems running vulnerable versions of PDF-XChange Editor.