CVE-2022-42417 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 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-18676.
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Analysis
by VulDB Data Team • 06/04/2026
This vulnerability represents a critical buffer overread flaw in PDF-XChange Editor that enables remote code execution through malicious TIF file processing. The vulnerability stems from insufficient input validation during the parsing of Tagged Image File Format files, where crafted data sequences can cause the application to read memory beyond the allocated buffer boundaries. This type of flaw falls under the common weakness enumeration CWE-125, which specifically addresses out-of-bounds read conditions that can lead to information disclosure, system crashes, or arbitrary code execution. The vulnerability was identified and tracked as ZDI-CAN-18676, highlighting its significance in the cybersecurity landscape.
The technical implementation of this vulnerability occurs when PDF-XChange Editor processes TIF files containing maliciously constructed data. During the parsing operation, the application fails to properly validate the boundaries of allocated memory buffers, allowing an attacker to craft TIF file content that extends beyond the intended buffer limits. This read past the end of buffer condition can result in the execution of arbitrary code within the context of the current process, effectively granting attackers full control over the affected system. The vulnerability requires user interaction to be exploited, meaning that victims must either visit a malicious webpage or open a specially crafted TIF file for the attack to succeed.
From an operational impact perspective, this vulnerability presents a significant threat to organizations relying on PDF-XChange Editor for document processing and viewing. The requirement for user interaction creates a social engineering component that makes the attack vector more challenging to defend against, as users may inadvertently encounter malicious content through phishing campaigns, compromised websites, or infected email attachments. Attackers can leverage this vulnerability to establish persistent access, escalate privileges, or deploy additional malware within the victim's environment, making it a particularly dangerous flaw in enterprise settings where document processing applications are widely used.
The mitigation strategies for this vulnerability should focus on immediate patching of the PDF-XChange Editor application to address the buffer overread condition in TIF file parsing. Organizations should implement strict file validation policies that prevent automatic processing of untrusted TIF files, particularly those received through email or downloaded from untrusted sources. Network-level controls such as web application firewalls and content filtering solutions can help block malicious TIF files before they reach end-user systems. Additionally, user education programs should emphasize the importance of avoiding suspicious files and websites, while system administrators should monitor for unusual process behavior that might indicate exploitation attempts. This vulnerability aligns with ATT&CK technique T1203, which covers exploitation for persistence, and T1059, covering command and scripting interpreter usage, as attackers can leverage the executed code to establish further footholds within compromised systems.