CVE-2022-42372 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 read 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-18347.
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Analysis
by VulDB Data Team • 04/29/2025
The vulnerability identified as CVE-2022-42372 represents a critical buffer overread flaw in PDF-XChange Editor, a widely used PDF viewing and editing application. This security weakness specifically manifests during the processing of Universal 3D (U3D) files, which are embedded 3D graphics formats commonly used in technical documentation and engineering applications. The vulnerability falls under the CWE-125 category of "Out-of-bounds Read" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell" when exploited in automated attack scenarios. The flaw exists within the application's file parsing mechanism where U3D file structures are improperly validated, creating a pathway for malicious code execution.
The technical exploitation of this vulnerability occurs through careful crafting of U3D file content that causes the PDF-XChange Editor to read memory beyond the bounds of allocated buffer space. When the application attempts to parse the malformed U3D data, it fails to properly validate the buffer boundaries, leading to a situation where subsequent memory access operations read beyond the intended data structure. This buffer overread condition can result in unpredictable behavior including application crashes, memory corruption, or more critically, arbitrary code execution within the context of the running PDF-XChange Editor process. The vulnerability requires user interaction to be successfully exploited, typically through visiting a malicious webpage that hosts the crafted U3D file or opening a malicious document containing such files.
The operational impact of CVE-2022-42372 extends beyond simple application instability, as it provides attackers with a potential foothold for more sophisticated attacks within targeted environments. Since the exploitation occurs within the context of the current process, successful attacks could lead to privilege escalation depending on the user's permissions and the system configuration. Attackers leveraging this vulnerability could potentially execute malicious payloads, establish persistent access, or use the compromised system as a launching point for further network infiltration. The vulnerability's classification as a remote code execution flaw makes it particularly dangerous in enterprise environments where PDF-XChange Editor is commonly deployed for document review and collaboration. Organizations utilizing this software face significant risk from spear-phishing campaigns or drive-by download attacks that could compromise their systems through the exploitation of this buffer overread condition.
Mitigation strategies for CVE-2022-42372 should prioritize immediate software updates from the vendor, as this vulnerability has been addressed in subsequent releases of PDF-XChange Editor. System administrators should implement strict file validation policies that restrict the processing of U3D files from untrusted sources, particularly in high-risk environments such as financial institutions or government agencies. Network-level protections including web application firewalls and content filtering systems can help prevent access to malicious U3D files hosted on compromised websites. Security teams should also consider implementing behavioral monitoring to detect anomalous process execution patterns that might indicate exploitation attempts. Additionally, user education regarding the risks of opening suspicious files and visiting untrusted websites remains crucial, as the vulnerability requires user interaction to be successfully exploited. Organizations should maintain updated vulnerability management processes to ensure rapid deployment of patches and implement network segmentation to limit the potential impact of successful exploitation attempts.