CVE-2024-27329 in PDF-XChange Editor
Summary
by MITRE • 04/02/2024
PDF-XChange Editor XPS 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 XPS 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-22285.
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Analysis
by VulDB Data Team • 04/18/2025
This vulnerability resides in the PDF-XChange Editor software's handling of XPS file parsing operations, representing a critical information disclosure flaw that could potentially escalate to arbitrary code execution. The vulnerability specifically affects the software's ability to process maliciously crafted XPS files, where the parsing logic fails to properly validate user-supplied data structures. This improper validation creates an out-of-bounds read condition that allows attackers to access memory locations beyond the intended data boundaries, potentially exposing sensitive information stored in adjacent memory regions.
The technical implementation of this flaw demonstrates a classic buffer over-read vulnerability pattern that aligns with CWE-125, which describes out-of-bounds read conditions in memory management operations. When the PDF-XChange Editor processes an XPS file, the parsing routine does not adequately check array indices or buffer limits before accessing memory locations, creating opportunities for information disclosure. The vulnerability requires user interaction to be exploited, meaning that a target must either visit a malicious webpage or open a specially crafted XPS file containing the malicious payload, making this a client-side attack vector that leverages social engineering techniques.
From an operational impact perspective, this vulnerability poses significant risks to organizations that rely on PDF-XChange Editor for document processing and viewing. The information disclosure aspect could expose sensitive data such as encryption keys, authentication tokens, or other confidential information stored in memory, potentially leading to further compromise of affected systems. The potential for arbitrary code execution when combined with other vulnerabilities creates a severe threat landscape where attackers could establish persistent access to compromised systems. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation.
The exploitation of this vulnerability typically involves crafting a malicious XPS file that contains malformed data structures designed to trigger the out-of-bounds read condition during parsing. When the target software attempts to process this malicious file, the parsing routine reads beyond allocated memory boundaries, potentially exposing memory contents to the attacker. This type of vulnerability is particularly concerning in enterprise environments where document processing applications are frequently used and may have elevated privileges. Security researchers have identified that the vulnerability affects specific versions of PDF-XChange Editor, making timely patch management critical for organizations to protect against exploitation attempts.
Organizations should implement immediate mitigations including updating to patched versions of PDF-XChange Editor, implementing network-based restrictions on XPS file handling, and deploying application whitelisting controls to prevent execution of untrusted XPS files. Additional protective measures should include monitoring for suspicious file access patterns and implementing security awareness training to reduce successful social engineering campaigns targeting this vulnerability. The vulnerability also highlights the importance of input validation and proper bounds checking in document processing applications, which should be considered in future development practices to prevent similar issues from arising in other software components.