CVE-2017-7584 in PDF Toolkit
Summary
by MITRE
Memory Corruption Vulnerability in Foxit PDF Toolkit before 2.1 allows an attacker to cause Denial of Service & Remote Code Execution when a victim opens a specially crafted PDF file.
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Analysis
by VulDB Data Team • 12/29/2019
The vulnerability identified as CVE-2017-7584 represents a critical memory corruption flaw within Foxit PDF Toolkit versions prior to 2.1, exposing users to significant security risks including both denial of service and remote code execution capabilities. This vulnerability stems from improper input validation and memory handling within the PDF parsing functionality of the toolkit, which is widely used for PDF processing and manipulation in various enterprise and consumer applications. The flaw specifically manifests when the software processes maliciously crafted PDF files that contain malformed or oversized data structures designed to trigger buffer overflows or heap corruption during parsing operations.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read errors. Attackers can exploit this weakness by creating specially crafted PDF documents that contain malicious code sequences or oversized data fields that cause the Foxit PDF Toolkit to allocate insufficient memory or overwrite adjacent memory regions. When a victim opens such a crafted file using the vulnerable software, the memory corruption occurs during the parsing process, leading to unpredictable behavior that can result in application crashes, system instability, or potentially full system compromise through remote code execution. The vulnerability is particularly dangerous because it leverages the normal operation of PDF viewing and processing software, making it difficult for users to distinguish between legitimate and malicious documents without proper security controls.
From an operational perspective, this vulnerability presents a severe threat to organizations that rely on Foxit PDF Toolkit for document processing, as it can be exploited through simple email attachments or web downloads containing malicious PDF files. The attack surface is broad since PDF files are commonly used across industries including finance, healthcare, and government sectors where document security is paramount. The remote code execution capability means that successful exploitation could allow attackers to gain complete control over affected systems, potentially leading to data exfiltration, lateral movement within networks, or establishment of persistent backdoors. Security analysts have documented this vulnerability as part of the ATT&CK framework under the technique T1059 for command and scripting interpreter, as attackers can leverage the compromised systems to execute arbitrary code and maintain access. The vulnerability also maps to T1203, which describes legitimate programs used for exploitation, since the attack utilizes the legitimate Foxit PDF Toolkit software to deliver malicious payloads.
Organizations should implement immediate mitigation strategies including updating to Foxit PDF Toolkit version 2.1 or later, which contains patches addressing the memory corruption issues. Network security controls such as PDF content filtering and sandboxing should be deployed to analyze suspicious documents before they reach end users. Additionally, security awareness training should emphasize the dangers of opening unexpected PDF attachments, and organizations should consider implementing application whitelisting policies to restrict execution of unauthorized PDF processing software. Regular vulnerability assessments and penetration testing should be conducted to identify similar memory corruption vulnerabilities in other PDF processing libraries and applications. System monitoring should be enhanced to detect anomalous behavior patterns that may indicate exploitation attempts, and incident response procedures should be updated to address potential compromise scenarios involving PDF-based attacks. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against sophisticated attacks targeting commonly used software components.