CVE-2024-8836 in PDF-XChange
Summary
by MITRE • 11/23/2024
PDF-XChange Editor TIF 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 TIF 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-24354.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/09/2025
The CVE-2024-8836 vulnerability represents a critical out-of-bounds read flaw within PDF-XChange Editor's handling of TIF image files, classified under CWE-125 as improper validation of array index bounds. This vulnerability exists in the software's image parsing subsystem where TIF file structures are processed without adequate boundary checks on user-supplied data. The flaw manifests when the application attempts to read memory locations beyond the allocated buffer boundaries during TIF file interpretation, creating a potential information disclosure vector that could expose sensitive data from adjacent memory regions. The vulnerability specifically affects installations where PDF-XChange Editor processes TIF files, making it particularly concerning for environments where users might encounter malicious image files in documents or web content.
The technical exploitation of this vulnerability requires user interaction through either visiting a malicious webpage that loads compromised TIF content or opening a malicious TIF file directly within the editor. This attack vector aligns with ATT&CK technique T1203 - Exploitation for Client Execution, where adversaries leverage software vulnerabilities to execute code in the context of the current process. The out-of-bounds read condition creates a memory access violation that could potentially be chained with other vulnerabilities to achieve arbitrary code execution, as the memory disclosure might reveal stack canaries, heap metadata, or other sensitive information that could aid in further exploitation attempts. The vulnerability's classification as an information disclosure issue means that while direct code execution may not be guaranteed, the exposure of memory contents provides attackers with valuable information for crafting more sophisticated attacks.
The operational impact of CVE-2024-8836 extends beyond simple information disclosure, as the vulnerability could enable attackers to gather intelligence about system memory layout and application state. This type of vulnerability is particularly dangerous in enterprise environments where PDF-XChange Editor is commonly used for document processing and review, as it could be exploited through web-based attacks or by embedding malicious TIF files in seemingly legitimate documents. The vulnerability's presence in a widely-used document editing application means that exploitation could occur through multiple vectors including email attachments, web downloads, or document sharing platforms where TIF images are commonly embedded. Organizations relying on PDF-XChange Editor for document processing should be particularly concerned about the potential for attackers to leverage this vulnerability to gain insights into system memory structures that could facilitate more advanced exploitation techniques.
Mitigation strategies for this vulnerability should focus on immediate patching of affected PDF-XChange Editor installations, as this represents the most effective defense against exploitation. System administrators should implement network-based protections such as web application firewalls and content filtering solutions to prevent access to known malicious TIF files and web pages containing compromised content. The vulnerability's requirement for user interaction means that security awareness training becomes crucial, as users must be educated about the risks of opening untrusted files or visiting suspicious websites. Additionally, implementing application whitelisting policies and restricting file type processing capabilities can reduce the attack surface, while regular security assessments should monitor for similar vulnerabilities in other image processing libraries that might be present in the same environment. Organizations should also consider monitoring for indicators of compromise related to TIF file processing and memory access patterns that might suggest exploitation attempts.