CVE-2018-5040 in Acrobat Reader
Summary
by MITRE
Adobe Acrobat and Reader 2018.011.20040 and earlier, 2017.011.30080 and earlier, and 2015.006.30418 and earlier versions have a Heap Overflow vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.
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Analysis
by VulDB Data Team • 04/06/2023
Adobe Acrobat and Reader versions prior to 2018.011.20040, 2017.011.30080, and 2015.006.30418 contain a critical heap overflow vulnerability that represents a significant security risk for end users and organizations. This vulnerability exists within the software's memory management functions and occurs when processing maliciously crafted PDF documents. The heap overflow vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes heap-based buffer overflows that can result in arbitrary code execution. The flaw manifests when the application attempts to write data beyond the boundaries of allocated heap memory blocks, potentially allowing attackers to overwrite adjacent memory locations and execute malicious code with the privileges of the current user.
The technical exploitation of this vulnerability requires an attacker to craft a specially designed PDF file that triggers the memory corruption during document parsing. When a user opens the malicious document, the application's handling of specific PDF elements causes the heap memory allocation to overflow, potentially leading to a crash or more severely, arbitrary code execution. This type of vulnerability is particularly dangerous because it can be delivered through email attachments, web downloads, or malicious websites, making it a prime target for social engineering campaigns. The vulnerability's impact extends beyond simple exploitation as it can be leveraged for privilege escalation attacks, especially when combined with other techniques that exploit the same or similar memory corruption flaws.
From an operational perspective, this vulnerability creates significant risk for organizations that rely on Adobe Acrobat and Reader for document processing and collaboration. The attack surface is broad since PDF documents are commonly shared across networks and email systems, making it easy for attackers to distribute malicious payloads. Security teams must consider that successful exploitation could result in complete system compromise, data theft, or unauthorized access to sensitive information. The vulnerability's presence in multiple version lines demonstrates Adobe's historical challenges with memory safety issues in their document processing libraries, which aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation. Organizations using affected versions face potential regulatory compliance issues and increased risk of advanced persistent threats targeting their document handling workflows.
Mitigation strategies for this vulnerability should prioritize immediate patching of all affected Adobe Acrobat and Reader installations to the latest available versions. System administrators should implement strict document validation policies and consider deploying sandboxing solutions to isolate PDF processing activities. Network-based controls such as web application firewalls and email filtering systems can help prevent delivery of malicious PDF files to end users. Organizations should also conduct regular vulnerability assessments to identify any remaining unpatched systems and maintain comprehensive incident response procedures that account for potential exploitation of this type of memory corruption vulnerability. Additionally, user education programs should emphasize the importance of only opening PDF documents from trusted sources and avoiding suspicious email attachments that may contain malicious payloads designed to exploit heap overflow vulnerabilities.