CVE-2016-4209 in Acrobat Reader
Summary
by MITRE
Heap-based buffer overflow in Adobe Reader and Acrobat before 11.0.17, Acrobat and Acrobat Reader DC Classic before 15.006.30198, and Acrobat and Acrobat Reader DC Continuous before 15.017.20050 on Windows and OS X allows attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 10/02/2024
The heap-based buffer overflow vulnerability identified as CVE-2016-4209 represents a critical security flaw affecting Adobe Reader and Acrobat software across multiple versions and operating systems. This vulnerability resides within the memory management subsystem of Adobe's document processing applications, specifically targeting the heap allocation mechanisms that handle dynamic memory operations during PDF file parsing. The flaw manifests when the software processes malformed or specially crafted PDF content, leading to memory corruption that can be exploited by malicious actors to gain unauthorized system access.
The technical implementation of this vulnerability stems from inadequate bounds checking during heap memory allocation operations. When Adobe Reader or Acrobat encounters specific patterns within PDF documents, particularly within embedded objects or stream data, the application fails to properly validate the size of data being copied into heap-allocated buffers. This oversight creates a condition where attacker-controlled data can overwrite adjacent memory locations, potentially corrupting critical program structures including return addresses, function pointers, or other executable code segments. The vulnerability operates at the heap memory level, making it particularly challenging to detect and exploit compared to stack-based buffer overflows due to the more complex memory management patterns involved.
The operational impact of CVE-2016-4209 extends beyond simple privilege escalation, as successful exploitation can result in complete system compromise through arbitrary code execution. Attackers leveraging this vulnerability can execute malicious payloads with the privileges of the targeted user, potentially leading to data theft, system persistence mechanisms, or lateral movement within network environments. The vulnerability affects widely deployed software applications across both Windows and macOS platforms, making it particularly attractive to threat actors seeking broad exploitation capabilities. Organizations running affected versions of Adobe Acrobat and Reader face significant risk exposure given the software's widespread adoption in enterprise environments and the ease with which malicious PDF files can be delivered through email attachments, web downloads, or other common attack vectors.
Security professionals should note that this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and demonstrates characteristics consistent with techniques documented in the attack tactics framework under the MITRE ATT&CK matrix. The exploitation methodology typically involves crafting malicious PDF files that trigger the memory corruption during normal document processing operations, often requiring no user interaction beyond opening the document. Mitigation strategies should prioritize immediate patch deployment to the latest versions of Adobe Reader and Acrobat software, alongside network-based security controls such as PDF content filtering and sandboxing mechanisms. Organizations should also implement comprehensive vulnerability management processes to identify and remediate similar memory corruption vulnerabilities across their software ecosystem, while considering additional defensive measures like application whitelisting and user education programs to reduce the attack surface and potential impact of such exploits.