CVE-2022-42386 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 U3D files. Crafted data in a U3D 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-18655.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42386 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor software that enables remote code execution through crafted U3D file manipulation. This vulnerability resides within the software's handling of Universal 3D (U3D) file format parsing, which is commonly used for 3D content within PDF documents. The flaw manifests when the application processes maliciously constructed U3D files that contain crafted data designed to trigger a read past the end of an allocated buffer, creating a classic buffer over-read condition that can be exploited by remote attackers. The vulnerability requires user interaction to be successfully exploited, meaning that targets must either visit a malicious webpage containing embedded U3D content or open a specifically crafted malicious file, making this an attack vector that relies on social engineering and user deception. From a technical perspective, this vulnerability maps directly to CWE-125, which describes out-of-bounds read conditions, and represents a significant security weakness in the memory management practices of the PDF-XChange Editor application. The buffer over-read condition occurs during the parsing phase of U3D files, where insufficient bounds checking allows attackers to access memory locations beyond the intended buffer boundaries, potentially exposing sensitive information or enabling further exploitation. The operational impact of this vulnerability extends beyond simple information disclosure, as it can serve as a stepping stone for more sophisticated attacks, with the potential for arbitrary code execution in the context of the current process, which aligns with ATT&CK technique T1059.1001 for command and scripting interpreter and T1203 for exploitation for client execution. The vulnerability's classification as a remote code execution threat means that attackers can potentially gain complete control over affected systems without requiring local access, making it particularly dangerous in enterprise environments where PDF processing is common. The fact that this vulnerability was tracked as ZDI-CAN-18655 indicates it was identified through coordinated disclosure channels, highlighting the importance of timely patch management and vulnerability assessment procedures. Organizations utilizing PDF-XChange Editor should prioritize immediate remediation through official vendor patches while implementing network-based protections such as web application firewalls and content filtering solutions that can detect and block malicious U3D file content. The vulnerability demonstrates the critical importance of robust input validation and memory safety practices in document processing applications, particularly those handling complex multimedia formats like 3D content within PDF documents. Security teams should also consider implementing user education programs to raise awareness about the risks of opening untrusted PDF files containing embedded 3D content, as the user interaction requirement makes social engineering a critical component of successful exploitation attempts. This vulnerability underscores the broader challenge of securing document viewers and editors against complex multimedia formats that can contain hidden attack vectors beyond traditional text and image content.