CVE-2018-5041 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.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 04/06/2023
The heap overflow vulnerability identified as CVE-2018-5041 affects Adobe Acrobat and Reader versions up to 2018.011.20040, 2017.011.30080, and 2015.006.30418, representing a critical security flaw that resides within the memory management mechanisms of these widely used document processing applications. This vulnerability manifests when the software processes maliciously crafted PDF files, specifically targeting heap memory allocation patterns that fail to properly validate input data lengths and boundaries. The flaw operates at the intersection of software security and memory corruption, where improper bounds checking allows attackers to manipulate heap memory structures through carefully constructed input payloads that exceed allocated buffer sizes. The vulnerability directly maps to CWE-121 Heap-based Buffer Overflow, a well-documented weakness category that describes buffer overflows occurring in heap memory regions where the attacker can control the size of data being written. The exploitation of this vulnerability follows established attack patterns described in the MITRE ATT&CK framework under the technique T1059 Command and Scripting Interpreter, as attackers can leverage the arbitrary code execution capability to run malicious payloads within the context of the current user.
The technical implementation of this heap overflow occurs when Adobe Reader or Acrobat processes embedded objects or streams within PDF documents that contain oversized data structures. The software fails to validate the length of data being copied into heap-allocated buffers, allowing attackers to overwrite adjacent memory locations with malicious content. This memory corruption can result in the execution of arbitrary code with the privileges of the current user, potentially enabling full system compromise when combined with other exploitation techniques or when the application runs with elevated permissions. The vulnerability's impact extends beyond simple code execution as it can be leveraged for privilege escalation attacks, data exfiltration, or as a foothold for further network penetration. The heap-based nature of the vulnerability means that the attacker can manipulate memory layout to achieve specific execution control, potentially allowing for return-oriented programming or other advanced exploitation techniques that bypass modern security mitigations such as stack canaries and address space layout randomization.
The operational implications of CVE-2018-5041 are particularly severe given the widespread deployment of Adobe Acrobat and Reader across enterprise environments, educational institutions, and individual users. Organizations that have not updated their software to patched versions face significant risk of targeted attacks, especially in environments where users frequently open untrusted PDF documents or receive email attachments containing malicious content. The vulnerability can be exploited through various attack vectors including phishing emails, compromised websites, or malicious document sharing platforms, making it particularly dangerous in corporate settings where document sharing is common. Security teams must consider this vulnerability as part of their broader threat landscape, as it provides attackers with a reliable method for establishing persistent access to systems while maintaining operational security due to the legitimate nature of PDF processing applications. The exploitation of this vulnerability can result in complete system compromise, data theft, or the installation of persistent backdoors, making it a high-priority target for both nation-state actors and cybercriminal organizations.
Organizations should prioritize immediate remediation through official Adobe security updates, as the vulnerability requires no user interaction to exploit once a malicious PDF is opened. Security measures should include implementing email filtering solutions to detect and block suspicious PDF attachments, deploying endpoint protection platforms that can identify anomalous behavior patterns, and establishing regular patch management procedures to ensure all systems remain current with security updates. Network segmentation and user access controls should be enforced to limit the potential impact of successful exploitation, while security monitoring should focus on detecting unusual PDF processing activities or unexpected code execution patterns. The vulnerability also highlights the importance of maintaining up-to-date security awareness training for users, as social engineering remains a primary attack vector for delivering malicious PDF documents. Additional mitigations may include disabling PDF processing in web browsers, implementing application whitelisting policies, and regularly reviewing system logs for signs of exploitation attempts or unauthorized code execution within user contexts.