CVE-2022-42416 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-18673.
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Analysis
by VulDB Data Team • 04/29/2025
CVE-2022-42416 represents a critical buffer overflow vulnerability affecting PDF-XChange Editor software that enables remote code execution through malicious TIF file manipulation. This vulnerability resides within the image parsing functionality of the application, specifically when processing TIF (Tagged Image File Format) files that contain crafted malicious data. The flaw manifests as a write past the end of an allocated buffer, a condition that occurs when the application attempts to write data beyond the boundaries of a pre-allocated memory region designated for storing TIF file information. This type of vulnerability falls under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability requires user interaction to be exploited, meaning that a remote attacker must convince a target to visit a malicious webpage or open a specially crafted TIF file that contains the malicious payload.
The technical exploitation of this vulnerability leverages the application's failure to properly validate the size and structure of TIF file data during parsing operations. When PDF-XChange Editor encounters a malformed TIF file, the parsing routine does not adequately check buffer boundaries before writing data, creating an opportunity for attackers to inject malicious code that executes within the context of the currently running process. This execution context is particularly dangerous because it operates with the privileges of the user running the PDF-XChange Editor application, potentially allowing attackers to gain full system access if the application runs with elevated permissions. The vulnerability's remote exploitability stems from the fact that malicious TIF files can be delivered through web-based attacks or email attachments, making it a significant threat vector for social engineering campaigns.
The operational impact of CVE-2022-42416 extends beyond simple code execution, as it represents a potential entry point for more sophisticated attack chains that align with ATT&CK framework techniques such as T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation. Attackers can leverage this vulnerability to establish persistent access, deploy additional malware, or escalate privileges within the compromised system. The vulnerability affects organizations that rely on PDF-XChange Editor for document processing, particularly those in sectors where document security is paramount such as legal, financial, and government institutions. The fact that this vulnerability was tracked as ZDI-CAN-18673 indicates it was identified by the Zero Day Initiative, highlighting its significance in the cybersecurity community and the potential for widespread exploitation across various deployment scenarios.
Mitigation strategies for CVE-2022-42416 should focus on immediate patching of affected software versions, implementing strict file validation policies for TIF file processing, and deploying network-based intrusion detection systems to monitor for suspicious file transfers. Organizations should also consider implementing application whitelisting controls that restrict the execution of untrusted TIF files, while ensuring that PDF-XChange Editor is updated to versions that contain proper bounds checking mechanisms. The vulnerability underscores the importance of input validation and memory safety practices in software development, particularly for applications that process untrusted file formats. Security teams should also conduct regular vulnerability assessments to identify similar buffer overflow conditions in other document processing applications and ensure that proper security controls are in place to prevent similar issues from occurring in the future.