CVE-2022-42400 in PDF-XChange Editor
Summary
by MITRE • 01/26/2023
This vulnerability allows remote attackers to execute arbitrary code 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 write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-18328.
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Analysis
by VulDB Data Team • 04/29/2025
The CVE-2022-42400 vulnerability represents a critical buffer overflow flaw in PDF-XChange Editor, a widely used PDF viewing and editing application. This vulnerability falls under the CWE-121 category of Stack-based Buffer Overflow, where maliciously crafted PDF content can cause the application to write data beyond the boundaries of allocated memory buffers. The vulnerability specifically manifests during the PDF file parsing process, which is a fundamental operation for any PDF reader application. Attackers can exploit this weakness by crafting specially designed PDF files that trigger the buffer overflow condition when processed by the vulnerable software.
The exploitation of this vulnerability requires user interaction, making it a client-side attack vector that relies on social engineering tactics. An attacker must convince a target to visit a malicious webpage hosting the crafted PDF file or to open a malicious PDF document directly. This user interaction requirement aligns with the ATT&CK technique T1203, which involves gaining access through web-based attacks that require user engagement. The buffer overflow occurs during the parsing phase of PDF files, where the application fails to properly validate or bounds-check the data structures within the PDF content. When the malicious PDF file is processed, the crafted data causes the program to write beyond the allocated buffer space, potentially corrupting adjacent memory locations and allowing for arbitrary code execution.
The operational impact of this vulnerability is severe as it allows remote code execution with the privileges of the current user process. This means that successful exploitation could lead to complete system compromise, depending on the user's privileges and the system configuration. The vulnerability affects installations of PDF-XChange Editor, which is commonly used in enterprise environments, making it a significant concern for organizations that rely on PDF processing capabilities. The attack surface extends beyond individual user machines to include any system running the vulnerable software, as the flaw exists within the core PDF parsing functionality. Organizations may face risks including data exfiltration, system persistence mechanisms, and lateral movement within their networks if attackers successfully exploit this vulnerability.
Mitigation strategies should focus on immediate software updates from the vendor, as this vulnerability was identified as ZDI-CAN-18328 and likely addressed through patches. System administrators should implement network-based protections such as web application firewalls and content filtering solutions that can detect and block malicious PDF content. Additional security measures include restricting user privileges when opening PDF files, implementing sandboxing techniques for PDF processing, and deploying endpoint protection solutions that monitor for suspicious memory access patterns. Organizations should also consider user education programs to raise awareness about phishing attacks and suspicious PDF attachments. The vulnerability demonstrates the importance of proper input validation and bounds checking in parsing libraries, which aligns with security best practices outlined in the OWASP Top Ten and other industry security frameworks that emphasize the need for robust input sanitization and memory safety mechanisms.