CVE-2022-42374 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. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-18403.
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Analysis
by VulDB Data Team • 04/29/2025
The vulnerability identified as CVE-2022-42374 represents a critical remote code execution flaw within PDF-XChange Editor, a widely used PDF document viewer and editor software. This vulnerability specifically targets the software's handling of Universal 3D (U3D) files, which are three-dimensional graphics files commonly embedded within PDF documents to provide interactive 3D content. The flaw exists in the software's parsing mechanism for U3D files, creating a dangerous condition where the application fails to properly validate object existence before performing operations on them. This type of vulnerability falls under the CWE-476 category, which specifically addresses NULL Pointer Dereference issues, where software attempts to access memory locations that have not been properly initialized or validated.
The exploitation of this vulnerability requires user interaction, meaning that an attacker must convince a victim to visit a malicious webpage or open a specially crafted malicious file containing the vulnerable U3D content. This interaction requirement makes the attack vector more challenging to execute at scale but does not eliminate the serious security implications. When a user encounters the malicious U3D content, the application's failure to validate object existence before operations creates a window for arbitrary code execution within the context of the current process. This privilege escalation allows attackers to potentially execute malicious code with the same permissions as the PDF-XChange Editor application, which could include reading, modifying, or deleting files on the victim's system.
From an operational impact perspective, this vulnerability presents significant risks to organizations that rely on PDF-XChange Editor for document processing and viewing. The remote code execution capability means that attackers could potentially install malware, steal sensitive data, or establish persistent access to compromised systems. The vulnerability affects the core functionality of the application and could be leveraged in targeted attacks against specific users or organizations. The fact that this vulnerability is classified as a remote code execution flaw places it in the ATT&CK framework under the technique T1203 - Exploitation for Client Execution, which specifically addresses attacks that leverage vulnerabilities to execute code on target systems. Organizations using PDF-XChange Editor are particularly vulnerable because the software is commonly used in business environments where users frequently open PDF documents from external sources.
The mitigation strategies for CVE-2022-42374 should focus on immediate patching of the affected software version, as this represents the most effective solution to address the root cause of the vulnerability. Users should be educated about the dangers of opening untrusted PDF files or visiting suspicious websites that may contain malicious U3D content. Network administrators should consider implementing content filtering solutions that can detect and block potentially malicious PDF files, particularly those containing embedded U3D elements. Additionally, organizations should monitor their systems for unusual activity that might indicate exploitation attempts, as the vulnerability could be used in conjunction with other attack vectors. The vulnerability's classification as ZDI-CAN-18403 indicates it was recognized by the Zero Day Initiative, highlighting its significance in the cybersecurity community and the importance of implementing immediate defensive measures to protect against potential exploitation attempts.