CVE-2022-42418 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. The issue results from the lack of proper validation of a user-supplied value prior to dereferencing it as a pointer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-18677.
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Analysis
by VulDB Data Team • 05/31/2026
This vulnerability in PDF-XChange Editor represents a critical remote code execution flaw that fundamentally compromises system security through improper input validation during file processing operations. The vulnerability specifically manifests within the TIF file parsing component of the software, where insufficient validation of user-supplied data creates a dangerous condition that allows attackers to manipulate memory access patterns. The flaw operates at the pointer dereferencing level, where a maliciously crafted TIF file can cause the application to interpret user-provided values as memory addresses without proper sanitization. This type of vulnerability falls under the CWE-476 category of NULL Pointer Dereference, though the specific implementation creates a more severe exploitation vector by allowing attackers to control the dereferenced value rather than simply causing a crash. The vulnerability's remote exploitability stems from the fact that PDF-XChange Editor's file parsing functionality is invoked automatically when processing documents, making it possible for attackers to deliver malicious payloads through web-based attacks or malicious file attachments.
The technical execution of this vulnerability requires careful manipulation of TIF file structures to inject malicious pointer values that will be dereferenced during normal processing operations. When the application encounters a specially crafted TIF file, it processes the image data without adequate validation of the pointer values contained within the file's metadata or structure. This allows an attacker to control what memory location the application attempts to access, potentially redirecting execution flow to malicious code injected into the process memory space. The attack vector requires user interaction through either visiting a malicious webpage that hosts the exploit or opening a malicious TIF file, which aligns with ATT&CK technique T1203 for Exploitation for Client Execution. The vulnerability operates at the application layer where the software's image processing capabilities are leveraged, making it particularly dangerous as it can be triggered through legitimate document processing workflows that users routinely engage with.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise, as the exploit executes within the context of the current process with the privileges of the user running PDF-XChange Editor. This means that if a user with administrative privileges opens a malicious file, the attacker gains elevated system access, potentially allowing for privilege escalation and lateral movement within network environments. The vulnerability's persistence across different operating system environments makes it particularly concerning for enterprise deployments where PDF-XChange Editor is widely used for document management and collaboration. The exploitability characteristics align with ATT&CK technique T1068 for Exploitation for Privilege Escalation, as the remote code execution capability can be leveraged to establish persistent access to target systems. Organizations using PDF-XChange Editor in production environments face significant risk from this vulnerability, as it can be exploited through various attack vectors including phishing campaigns, compromised websites, or malicious document sharing.
Mitigation strategies for this vulnerability should focus on immediate patching of affected software versions, as well as implementing defensive measures to prevent exploitation attempts. Organizations should deploy network-based intrusion detection systems that can identify suspicious TIF file processing patterns and block malicious file transfers. The implementation of application whitelisting policies can prevent unauthorized execution of malicious code, while regular security assessments should verify that no unauthorized modifications have occurred in the PDF-XChange Editor installation. Security teams should also implement user education programs to raise awareness about the risks of opening untrusted files and visiting suspicious websites. From a compliance perspective, this vulnerability would trigger requirements under various security frameworks including ISO 27001 and NIST cybersecurity guidelines, which mandate regular vulnerability assessments and prompt remediation of critical security flaws. The vulnerability's classification as a remote code execution issue places it in the highest severity category for enterprise security risk management, requiring immediate attention and comprehensive remediation strategies to protect against potential exploitation attempts.