CVE-2023-42067 in PDF-XChange Editor
Summary
by MITRE • 05/03/2024
PDF-XChange Editor JB2 File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information 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 JB2 files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated object. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-20984.
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Analysis
by VulDB Data Team • 05/17/2025
The CVE-2023-42067 vulnerability represents a critical out-of-bounds read flaw within the PDF-XChange Editor software's handling of JB2 image files. This vulnerability resides in the file parsing mechanism that processes JB2 format data, which is commonly used for image compression in PDF documents. The flaw stems from insufficient input validation during the parsing process, where the software fails to properly verify the boundaries of user-supplied data before accessing memory locations. This type of vulnerability falls under the CWE-125 category of out-of-bounds read conditions, which is classified as a fundamental memory safety issue that can lead to information disclosure and potentially more severe exploitation vectors.
The exploitation of this vulnerability requires user interaction, making it a client-side attack vector that typically manifests when users visit malicious websites or open compromised files containing specially crafted JB2 data. The attack scenario involves an attacker constructing a malicious JB2 file or webpage that triggers the vulnerable parsing code path, causing the application to read memory beyond the intended buffer boundaries. This out-of-bounds memory access can expose sensitive data from adjacent memory locations, potentially including stack contents, heap data, or other process memory segments that may contain credentials, encryption keys, or other confidential information. The vulnerability's classification aligns with ATT&CK technique T1203, which covers data from information repositories, as it enables unauthorized access to sensitive data through memory corruption.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a potential pathway for more sophisticated attacks. When combined with other vulnerabilities present in the same software environment, an attacker could leverage this out-of-bounds read to achieve arbitrary code execution within the context of the PDF-XChange Editor process. This represents a significant escalation from a simple information disclosure vulnerability to a full remote code execution threat. The vulnerability affects versions of PDF-XChange Editor that process JB2 files, making it particularly concerning for organizations that rely heavily on document processing and PDF manipulation tools, especially in environments where users may encounter untrusted content.
Organizations should prioritize immediate mitigation strategies including updating to patched versions of PDF-XChange Editor, implementing network-based restrictions on JB2 file handling, and deploying application whitelisting controls to prevent execution of untrusted PDF content. The vulnerability demonstrates the importance of proper input validation and boundary checking in multimedia processing libraries, where image and document parsing components often become attack surfaces due to the complex nature of file format specifications. Security teams should also consider monitoring for unusual memory access patterns and implement sandboxing measures for PDF processing applications to contain potential exploitation attempts. This vulnerability serves as a reminder of how seemingly minor parsing flaws in document handling software can create significant security risks when users are exposed to untrusted content through web browsing or file attachment scenarios.