CVE-2022-42388 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-18657.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42388 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor software that enables remote information disclosure and potential arbitrary code execution. This vulnerability resides within the Universal 3D file parsing functionality, specifically when processing crafted U3D files that contain malformed data structures. The flaw manifests as a read past the end of an allocated buffer, which occurs during the parsing of U3D file components that are commonly embedded within PDF documents. This type of vulnerability maps to CWE-125: "Out-of-bounds Read" and falls under the broader category of memory safety issues that have historically led to severe security consequences. The vulnerability requires user interaction to be exploited, meaning that a victim must either visit a malicious webpage hosting a crafted U3D file or open a malicious PDF document containing such files. This user interaction requirement aligns with ATT&CK technique T1203: "Exploitation for Client Execution" which describes how attackers can leverage vulnerabilities in applications to execute code on target systems. The attack vector typically involves embedding malicious U3D content within PDF documents or hosting such files on compromised websites that users may inadvertently access. When a user opens the malicious file or visits the compromised webpage, the PDF-XChange Editor application attempts to parse the U3D content and encounters the crafted data that triggers the buffer overflow condition. This overflow can result in information disclosure through memory corruption, potentially exposing sensitive data from the application's memory space. The vulnerability's severity is amplified by its potential to serve as a stepping stone for more sophisticated attacks, as the buffer overflow condition can be leveraged in combination with other vulnerabilities to achieve arbitrary code execution within the context of the current process. This execution context typically means that an attacker could gain the same privileges as the user running the PDF-XChange Editor application, potentially leading to complete system compromise if the application runs with elevated privileges. The vulnerability affects all versions of PDF-XChange Editor that support U3D file parsing functionality, making it particularly concerning given the widespread use of PDF viewers in enterprise environments. The attack scenario demonstrates how seemingly benign file formats can become vectors for sophisticated attacks, highlighting the importance of proper input validation and memory safety practices in document processing applications. Organizations should consider implementing network-based protections such as web application firewalls and content filtering solutions that can detect and block access to known malicious U3D file content. Additionally, regular security updates and patches should be deployed immediately upon availability, as this vulnerability could be actively exploited in the wild. The remediation approach should include both immediate patch deployment and user education about avoiding suspicious PDF documents and web content. From a defensive perspective, this vulnerability underscores the need for robust sandboxing mechanisms and application hardening practices that can limit the impact of such memory corruption vulnerabilities. The vulnerability's classification as a remote information disclosure issue means that attackers can potentially gather sensitive information about the target system, including memory layout details and application state information that could be valuable for planning more complex attacks. This makes the vulnerability particularly dangerous in targeted attack scenarios where attackers seek to gather intelligence before launching more sophisticated exploitation attempts.