CVE-2022-42389 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-18658.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42389 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor software that enables remote attackers to extract sensitive information and potentially execute arbitrary code. This vulnerability specifically manifests during the parsing of Universal 3D (U3D) files, which are three-dimensional graphics formats commonly embedded within PDF documents. The flaw constitutes a classic buffer over-read condition where malformed U3D data can cause the application to read memory beyond the allocated buffer boundaries, leading to information disclosure and potential code execution.
The technical implementation of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions in software applications. When PDF-XChange Editor processes a maliciously crafted U3D file, the parser fails to properly validate buffer limits during memory operations, allowing an attacker to manipulate memory access patterns. This type of vulnerability falls under the ATT&CK technique T1059.007 for Command and Scripting Interpreter, as it enables attackers to execute code within the application's process context. The vulnerability requires user interaction through either visiting a malicious webpage containing embedded U3D content or opening a specially crafted PDF file, making it a typical client-side exploitation vector.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass full system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability can gain arbitrary code execution privileges within the PDF-XChange Editor process, potentially leading to complete system compromise depending on the user's privileges. The buffer over-read condition creates opportunities for attackers to extract sensitive memory contents, including cryptographic keys, user credentials, or other confidential data stored in the application's memory space. This vulnerability particularly affects environments where users frequently open PDF documents from untrusted sources, making it a significant risk for corporate networks and organizations handling sensitive information.
Mitigation strategies for CVE-2022-42389 should prioritize immediate software updates from the vendor, as this vulnerability has been addressed in subsequent releases of PDF-XChange Editor. Organizations should implement network-based controls such as web application firewalls and content filtering to block access to known malicious U3D content and suspicious PDF files. Additionally, user education programs should emphasize the importance of avoiding untrusted PDF documents and web content that may contain embedded malicious U3D files. Security teams should consider implementing sandboxing mechanisms for PDF processing and monitoring for unusual memory access patterns that could indicate exploitation attempts. The vulnerability demonstrates the importance of robust input validation and memory safety practices in document processing applications, particularly those handling complex multimedia formats like U3D files that require extensive parsing and memory management.