CVE-2022-42380 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-18649.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42380 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor software, specifically within its handling of Universal 3D (U3D) file formats. This vulnerability resides in the parsing mechanism that processes U3D content embedded within PDF documents, creating a pathway for remote code execution when legitimate users interact with maliciously crafted files. The flaw manifests as a classic buffer overflow condition where crafted data within a U3D file triggers a write operation that extends beyond the boundaries of an allocated memory buffer, potentially allowing attackers to overwrite adjacent memory locations with malicious code. This type of vulnerability aligns with CWE-121, which describes buffer overflow conditions where insufficient bounds checking permits writes beyond allocated memory regions, and represents a significant concern within the context of software security practices.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to leverage the compromised application's privileges and context to perform malicious activities. When a user opens a malicious U3D file or visits a webpage containing such content, the vulnerable parsing logic executes without proper input validation, leading to memory corruption that can be exploited to gain control over the application process. The requirement for user interaction makes this vulnerability particularly dangerous in phishing scenarios or when users encounter malicious content in legitimate documents, as it requires no special network privileges or administrative access from the attacker's perspective. This characteristic places the vulnerability within the ATT&CK framework under the T1203 - Exploitation for Client Execution tactic, where adversaries leverage application vulnerabilities to execute malicious code on target systems.
From a mitigation standpoint, organizations should prioritize immediate patching of affected PDF-XChange Editor installations to address the buffer overflow condition in U3D file processing. System administrators should implement network-based controls to block or scan U3D file attachments and embedded content, particularly in high-risk environments where users may encounter untrusted documents. The vulnerability demonstrates the importance of input validation and bounds checking in file format parsers, as proper memory management practices could prevent the overflow condition from occurring. Additionally, user education regarding the risks of opening untrusted PDF files and the potential for embedded malicious content remains crucial, as the attack vector requires human interaction to be successful. Security monitoring should focus on identifying unusual file processing activities or memory access patterns that may indicate exploitation attempts, while maintaining awareness of similar vulnerabilities in other PDF processing libraries that may present comparable attack surfaces. The vulnerability serves as a reminder of the critical need for robust memory safety practices in applications handling complex file formats and the necessity for regular security assessments of document processing components.