CVE-2025-0901 in PDF-XChange Editor
Summary
by MITRE • 02/11/2025
PDF-XChange Editor Doc Object Out-Of-Bounds Read Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code 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 handling of Doc objects. 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 buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-25372.
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Analysis
by VulDB Data Team • 02/13/2025
The CVE-2025-0901 vulnerability represents a critical out-of-bounds read flaw in PDF-XChange Editor that exposes systems to remote code execution attacks. This vulnerability specifically targets the document object handling mechanism within the PDF editing software, creating a pathway for malicious actors to compromise affected systems without requiring local access. The flaw manifests when the application processes specially crafted PDF documents containing malformed Doc objects that trigger improper memory access patterns. The vulnerability's classification as a remote code execution issue indicates that attackers can exploit this weakness from anywhere on the network, making it particularly dangerous for enterprise environments where PDF documents are frequently shared and opened. Security researchers have identified this as a ZDI-CAN-25372 vulnerability, highlighting its significance within the cybersecurity community and its potential for widespread exploitation.
The technical root cause of this vulnerability stems from insufficient input validation within the Doc object processing code path. When PDF-XChange Editor encounters a malicious document, the application fails to properly validate the boundaries of user-supplied data structures, leading to memory access violations that extend beyond allocated buffer limits. This type of flaw aligns with CWE-125, which specifically addresses out-of-bounds read conditions in software applications. The vulnerability's exploitation requires user interaction through either visiting a malicious webpage or opening a compromised PDF file, making it a classic example of a client-side attack vector. The lack of proper bounds checking during document parsing allows attackers to craft malicious payloads that can trigger memory corruption, potentially leading to arbitrary code execution in the context of the running PDF-XChange Editor process. This memory corruption can be leveraged to overwrite critical program variables or function pointers, enabling attackers to redirect execution flow and inject malicious instructions.
The operational impact of CVE-2025-0901 extends beyond simple privilege escalation, as it can result in complete system compromise when exploited successfully. Attackers who successfully exploit this vulnerability can execute code with the privileges of the PDF-XChange Editor process, which typically runs with the same permissions as the user who opened the document. This means that if a user with administrative privileges opens a malicious PDF, the attacker could gain elevated system access. The vulnerability affects organizations that rely heavily on PDF document processing, including legal firms, government agencies, and financial institutions that frequently handle sensitive documents. The remote nature of the attack means that threat actors can target users through email attachments, web-based PDF viewers, or compromised websites without requiring physical access to the target system. Additionally, the vulnerability's presence in a widely used PDF editor increases the attack surface significantly, as numerous organizations may have the software installed across their networks, making mass exploitation a realistic concern.
Organizations should implement immediate mitigation strategies to protect against CVE-2025-0901 exploitation attempts. The most effective approach involves applying the vendor-provided security patches as soon as they become available, which typically address the underlying buffer validation issues in the Doc object handling code. Network administrators should consider implementing web application firewalls and content filtering solutions that can detect and block malicious PDF content before it reaches end users. Email security solutions should be configured to scan PDF attachments for known malicious patterns and suspicious file characteristics that may indicate exploitation attempts. Users should be educated about the risks of opening PDF documents from untrusted sources and trained to recognize potentially malicious content. The implementation of principle of least privilege should be enforced, ensuring that PDF-XChange Editor runs with minimal required permissions to reduce potential damage from successful exploitation. Additionally, organizations should consider deploying endpoint detection and response solutions that can monitor for suspicious memory access patterns or code execution behaviors that may indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to techniques involving initial access through malicious files and privilege escalation through code execution, making it a critical target for defensive security operations.