CVE-2018-5032 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 heap overflow vulnerability that represents a critical security flaw in the software's memory management implementation. 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 application processes malformed PDF files, specifically during the handling of certain embedded objects or streams that trigger improper memory allocation and subsequent overflow conditions.
The technical exploitation of this vulnerability requires an attacker to craft a malicious PDF document that, when opened by an affected version of Adobe Reader or Acrobat, triggers the heap overflow condition. When the vulnerable software attempts to process the malicious input, it allocates insufficient memory for the data structure, causing subsequent writes to overwrite adjacent memory locations. This memory corruption can be leveraged to execute arbitrary code with the privileges of the current user, effectively providing a remote code execution capability. The vulnerability is particularly dangerous because PDF files are commonly shared via email, web downloads, and file transfer protocols, making successful exploitation likely in targeted attack scenarios.
The operational impact of CVE-2018-5032 extends beyond simple code execution, as it enables attackers to establish persistent access to affected systems. Attackers can use this vulnerability to install malware, steal sensitive data, or establish backdoor access to corporate networks. The vulnerability affects multiple versions of Adobe's software, indicating a widespread exposure that requires immediate remediation across enterprise environments. Organizations running these vulnerable versions face significant risk of compromise, particularly in environments where users frequently open PDF documents from untrusted sources. The exploitability of this vulnerability is enhanced by the fact that PDF readers are often set as default applications for document viewing, making user interaction with malicious content highly probable.
Mitigation strategies for CVE-2018-5032 primarily focus on immediate software updates to the latest versions of Adobe Acrobat and Reader, which contain patches addressing the heap overflow vulnerability. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive updates promptly. Additional defensive measures include deploying PDF content filtering solutions that scan documents for malicious patterns, implementing application whitelisting policies to restrict execution of unauthorized software, and configuring user permissions to limit the impact of potential exploitation. Network-based protections such as intrusion detection systems can help identify attempts to exploit this vulnerability, while security awareness training should emphasize the dangers of opening suspicious PDF files from unknown sources. The vulnerability also aligns with ATT&CK technique T1203, which describes exploitation of software vulnerabilities for privilege escalation and persistence, making comprehensive security measures essential for protecting against this specific threat vector.