CVE-2022-42371 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 U3D files. Crafted data in a U3D 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-18346.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42371 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor, a widely used PDF document viewer and editor software. This vulnerability resides within the software's handling of Universal 3D (U3D) files, which are three-dimensional graphics files commonly embedded in PDF documents for enhanced visual content. The flaw manifests during the parsing process of U3D files, where the application fails to properly validate input data, leading to a classic buffer overflow condition. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, making it particularly dangerous as it can be exploited to overwrite adjacent memory locations and potentially execute arbitrary code.
The exploitation of this vulnerability requires user interaction, meaning that an attacker must convince a victim to visit a malicious webpage hosting a crafted U3D file or open a malicious PDF document containing such content. This social engineering component makes the attack vector more complex but also more realistic in real-world scenarios where users might encounter malicious content in legitimate business or personal contexts. The buffer overflow occurs when the application attempts to write data beyond the bounds of a pre-allocated memory buffer, creating an opportunity for attackers to overwrite critical memory segments including return addresses and function pointers.
From an operational impact perspective, successful exploitation of this vulnerability allows attackers to execute code with the privileges of the currently running PDF-XChange Editor process, which typically runs with the same permissions as the user who launched the application. This presents a significant security risk as attackers could potentially gain access to sensitive documents, establish persistent backdoors, or escalate privileges to system-level access. The vulnerability's classification aligns with ATT&CK technique T1059.007 for command and script interpreter, as the execution of arbitrary code could enable attackers to run malicious scripts or commands on the compromised system.
The technical implementation of this vulnerability demonstrates poor input validation and memory management practices within the PDF-XChange Editor's U3D parsing component. Attackers can craft malicious U3D files containing oversized or malformed data structures that, when processed by the vulnerable software, trigger the buffer overflow condition. This type of vulnerability is particularly concerning in enterprise environments where PDF-XChange Editor is commonly used for document review and collaboration, as it could serve as an initial compromise vector for broader network infiltration. The vulnerability's discovery and patching process follows standard security industry practices, with the issue being tracked as ZDI-CAN-18346, indicating responsible disclosure and coordinated vulnerability management.
Organizations should implement immediate mitigations including updating to the latest version of PDF-XChange Editor that contains the patched U3D parsing functionality. Network-level protections such as web application firewalls and content filtering systems can help detect and block malicious U3D files before they reach users. Additionally, user education and awareness programs should emphasize the importance of avoiding suspicious websites and email attachments containing PDF documents with embedded 3D content. Security teams should also consider implementing application whitelisting policies that restrict execution of unauthorized PDF viewers or editors, particularly in high-security environments where the risk of exploitation is elevated.