CVE-2018-5036 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 falls under the Common Weakness Enumeration category CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory regions. The flaw occurs when the software processes malformed PDF files, specifically during memory allocation operations that fail to properly validate input data lengths before copying content into heap-allocated buffers.
The technical exploitation of this vulnerability requires an attacker to craft a malicious PDF document that triggers the heap overflow condition when opened by an affected version of Adobe Reader or Acrobat. When the vulnerable application attempts to parse the specially crafted PDF content, it allocates memory on the heap for processing but fails to validate the size of incoming data against the allocated buffer boundaries. This allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution with the privileges of the currently logged-in user. The attack vector is particularly concerning as it can be delivered through email attachments or web downloads, making it highly accessible to threat actors.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a persistent foothold in target environments. Successful exploitation can lead to complete system compromise, data exfiltration, and lateral movement within networks where the vulnerable software is installed. Organizations running these older versions face significant risk exposure since the vulnerability affects widely deployed software across multiple operating systems including windows and macos platforms. The attack surface is broad as these applications are commonly used for document sharing and business communications, making them attractive targets for advanced persistent threats.
Security practitioners should prioritize immediate remediation of this vulnerability through official Adobe patches and updates. Organizations should implement network segmentation and access controls to limit exposure while monitoring for suspicious PDF file handling activities. The mitigation strategy should include mandatory software updates, endpoint protection solutions, and user education about avoiding untrusted PDF attachments. Additionally, implementing application whitelisting policies can help prevent execution of vulnerable Adobe components while ensuring that only approved versions of the software can run on enterprise systems. This vulnerability demonstrates the critical importance of maintaining up-to-date software patches and following security best practices outlined in frameworks such as the mitre attack framework where such vulnerabilities often serve as initial access points for more sophisticated attacks.