CVE-2022-42419 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 TIF files. Crafted data in a TIF 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-18700.
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Analysis
by VulDB Data Team • 05/19/2026
This vulnerability represents a critical buffer overflow condition within PDF-XChange Editor that enables remote code execution through malicious TIF file processing. The flaw manifests during the parsing of TIF image files where crafted data structures can cause the application to write beyond the bounds of allocated memory buffers. This type of vulnerability falls under CWE-121 which specifically addresses stack-based buffer overflow conditions, and more broadly under CWE-787 which covers out-of-bounds write vulnerabilities. The attack vector requires user interaction as victims must either visit a malicious webpage containing embedded TIF content or open a specially crafted TIF file directly within the application. This makes the vulnerability particularly dangerous in phishing campaigns or when users encounter malicious attachments in email communications.
The technical implementation of this vulnerability leverages the application's insufficient input validation during TIF file parsing operations. When PDF-XChange Editor encounters a malformed TIF file, the parsing routine fails to properly bounds-check array accesses or memory allocations, allowing an attacker to overwrite adjacent memory regions. This memory corruption can be strategically manipulated to overwrite function pointers, return addresses, or other critical program state information. The vulnerability exists in the context of privilege escalation where the attacker executes code within the security context of the running PDF-XChange Editor process, typically with the privileges of the user who initiated the application. According to ATT&CK framework, this maps to technique T1203 which involves exploitation of remote services through malicious file content, and T1059 which covers command and scripting interpreter usage.
The operational impact of this vulnerability extends beyond simple code execution as it can enable complete system compromise when combined with other attack techniques. An attacker who successfully exploits this vulnerability can potentially install malware, establish persistence mechanisms, or escalate privileges to gain administrative access. The vulnerability affects all versions of PDF-XChange Editor that process TIF files, making it particularly concerning given the widespread use of this PDF editing software in enterprise environments. Organizations using PDF-XChange Editor should consider immediate mitigation strategies including application whitelisting, network-based restrictions, and user education about avoiding suspicious file attachments. The vulnerability's classification as ZDI-CAN-18700 indicates it was identified through the Zero Day Initiative's vulnerability disclosure program, highlighting its significance in the cybersecurity community. Security teams should prioritize patch management and implement monitoring for suspicious file access patterns that might indicate exploitation attempts.
This vulnerability demonstrates the importance of input validation and memory safety in document processing applications, particularly those handling multiple file formats. The TIF format parsing logic represents a common attack surface where insufficient bounds checking can lead to severe consequences. Organizations should implement comprehensive security testing procedures including fuzzing and static analysis of third-party libraries used in document processing applications. The vulnerability also underscores the need for defense-in-depth strategies that go beyond traditional antivirus solutions, incorporating behavioral monitoring and application control measures to prevent exploitation of such memory corruption vulnerabilities.