CVE-2024-8824 in PDF-XChange
Summary
by MITRE • 11/23/2024
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-24262.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/09/2025
The CVE-2024-8824 vulnerability represents a critical information disclosure flaw within PDF-XChange Editor's handling of JB2 image files, demonstrating a classic out-of-bounds read condition that exposes sensitive data through improper input validation. This vulnerability resides in the parser component responsible for processing JB2 file formats, which are commonly used for image compression within PDF documents. The flaw manifests when the application attempts to read memory locations beyond the boundaries of allocated data structures during JB2 file parsing operations, creating potential pathways for attackers to extract confidential information from the application's memory space.
The technical implementation of this vulnerability stems from insufficient bounds checking during JB2 file processing, where user-supplied data is not adequately validated before being processed by the parser. When a malicious JB2 file is encountered, the application's parsing logic fails to verify array indices or buffer limits, allowing an attacker to craft specially formatted files that trigger memory access violations. This condition creates opportunities for information disclosure attacks where adjacent memory segments containing sensitive data such as stack canaries, heap metadata, or other process information may be inadvertently exposed to unauthorized parties. The vulnerability specifically aligns with CWE-129, which addresses insufficient validation of length of input buffers, and represents a subset of the broader class of out-of-bounds read vulnerabilities that frequently appear in multimedia processing libraries.
The operational impact of CVE-2024-8824 extends beyond simple information disclosure, as it provides attackers with foundational elements for more sophisticated exploitation techniques. While the immediate consequence involves data leakage through memory reads, this vulnerability can serve as a stepping stone for attackers to build more complex attack chains. The requirement for user interaction through visiting malicious web pages or opening compromised files aligns with ATT&CK technique T1203, which involves exploiting application vulnerabilities through user interaction. Attackers can leverage this vulnerability in conjunction with other memory corruption issues to achieve arbitrary code execution, potentially compromising the entire system through privilege escalation or lateral movement within network environments.
Mitigation strategies for CVE-2024-8824 should prioritize immediate patch application from the vendor, as this represents a critical security risk that can be exploited remotely. Organizations should implement network-based controls including web application firewalls and content filtering systems to prevent access to known malicious domains hosting exploit content. Additionally, security teams should conduct comprehensive vulnerability assessments to identify all instances of PDF-XChange Editor installations within their environment, particularly focusing on systems that process untrusted PDF documents. The vulnerability's classification as a remote information disclosure threat necessitates proactive network monitoring for suspicious traffic patterns and anomalous memory access behaviors. Security hardening measures should include implementing least-privilege execution contexts for PDF processing applications and regular security updates to address similar vulnerabilities in multimedia processing components. The issue demonstrates the importance of proper input validation and bounds checking in multimedia libraries, aligning with industry best practices for secure coding standards that prevent buffer overflows and memory corruption attacks.