CVE-2024-8844 in PDF-XChange
Summary
by MITRE • 11/23/2024
PDF-XChange Editor PDF 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 PDF 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-24550.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/09/2025
The CVE-2024-8844 vulnerability represents a critical out-of-bounds read condition affecting PDF-XChange Editor's PDF file parsing functionality. This vulnerability falls under the category of information disclosure flaws that can potentially lead to more severe exploitation vectors when combined with other weaknesses. The flaw manifests during the parsing of PDF documents where the application fails to properly validate user-supplied data structures, creating opportunities for attackers to read memory locations beyond the intended boundaries of allocated objects. This type of vulnerability is particularly dangerous because it can expose sensitive information stored in memory, potentially including credentials, system details, or other confidential data that could be leveraged for further attacks.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the PDF parsing engine of PDF-XChange Editor. When processing maliciously crafted PDF files, the software does not properly bounds-check array indices or object sizes, allowing an attacker to manipulate the parsing process to read beyond allocated memory regions. This behavior aligns with CWE-129, which describes improper validation of array index values, and can be classified as a memory safety vulnerability under the broader category of buffer overflows or out-of-bounds reads. The vulnerability requires user interaction to be exploited, meaning that victims must either visit a malicious webpage hosting a crafted PDF or open a specifically crafted file, making this a client-side attack vector that relies on social engineering or phishing techniques to succeed.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential pathways for more sophisticated attacks within the target system's execution context. An attacker who successfully exploits this vulnerability could potentially read sensitive memory contents that might include authentication tokens, system configuration details, or other data that could be used to escalate privileges or execute arbitrary code. The fact that this vulnerability can be combined with other weaknesses to achieve arbitrary code execution makes it particularly concerning from a threat modeling perspective, as it represents a potential stepping stone for attackers to gain deeper system access. This aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where the initial information disclosure could provide attackers with the necessary system information to craft more targeted payloads.
Organizations using PDF-XChange Editor should prioritize immediate remediation through vendor-provided patches or updates to address this vulnerability. The recommended mitigation strategy involves implementing strict input validation measures and ensuring that all PDF processing components properly bounds-check all user-supplied data before processing. Additionally, network administrators should consider implementing web application firewalls or content filtering solutions to prevent access to known malicious PDF content. Security teams should also conduct thorough vulnerability assessments of their PDF processing workflows and implement monitoring solutions to detect potential exploitation attempts. The vulnerability's classification as a ZDI-CAN-24550 indicates it has been recognized by the cybersecurity community and should be treated with high priority in vulnerability management programs. Regular security updates and patch management processes should be enforced to prevent exploitation of similar memory safety vulnerabilities in other PDF processing applications.