CVE-2018-12836 in Acrobat Reader
Summary
by MITRE
Adobe Acrobat and Reader versions 2018.011.20063 and earlier, 2017.011.30102 and earlier, and 2015.006.30452 and earlier have a heap overflow vulnerability. Successful exploitation could lead to arbitrary code execution.
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Analysis
by VulDB Data Team • 08/08/2024
Adobe Acrobat and Reader applications contain a critical heap overflow vulnerability that affects multiple versions across different release cycles. This vulnerability stems from improper input validation within the software's handling of malformed PDF files, creating a condition where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. The flaw exists in the processing logic that manages memory allocation for PDF objects, particularly when parsing complex document structures that exceed expected buffer sizes. According to CWE-121, this represents a classic heap-based buffer overflow condition where attacker-controlled data can overwrite adjacent memory locations, potentially corrupting program execution flow.
The technical exploitation of this vulnerability requires an attacker to craft a malicious PDF file that triggers the buffer overflow during document parsing. When the vulnerable application processes such a file, the heap corruption can result in arbitrary code execution with the privileges of the victim user. The attack vector typically involves social engineering to convince users to open the malicious document, making this a prevalent target for phishing campaigns and targeted attacks. The vulnerability's impact extends beyond simple code execution as it can be leveraged for privilege escalation and persistent access to compromised systems. This aligns with ATT&CK technique T1059 which describes the use of command and scripting interpreters for execution, where successful exploitation enables attackers to establish persistent footholds.
The operational implications of CVE-2018-12836 are severe given the widespread deployment of Adobe Reader across enterprise environments and individual workstations. Organizations running affected versions face significant risk of data breaches, lateral movement, and full system compromise. The vulnerability affects both desktop and mobile platforms, expanding the potential attack surface considerably. Security teams must prioritize patch management for this vulnerability as it provides attackers with a straightforward path to execute malicious code without requiring advanced exploitation techniques. The remediation process involves immediate deployment of Adobe's security patches, which address the underlying memory handling issues through improved bounds checking and input validation mechanisms. System administrators should also implement network monitoring to detect potential exploitation attempts and consider deploying additional security controls such as application whitelisting to prevent execution of untrusted PDF files.
Organizations should also conduct comprehensive vulnerability assessments to identify all systems running affected Adobe versions and establish incident response procedures for potential exploitation. The vulnerability's classification as a heap overflow makes it particularly susceptible to exploitation through techniques such as return-oriented programming and stack pivoting, further increasing its danger. Regular security awareness training becomes essential as users may unknowingly execute malicious payloads through seemingly legitimate PDF documents. The attack surface remains particularly broad due to Adobe Reader's default installation on Windows systems, making this vulnerability a high-priority target for threat actors seeking to establish persistent access to enterprise networks.