CVE-2016-6957 in Acrobat Reader
Summary
by MITRE
Adobe Reader and Acrobat before 11.0.18, Acrobat and Acrobat Reader DC Classic before 15.006.30243, and Acrobat and Acrobat Reader DC Continuous before 15.020.20039 on Windows and OS X allow attackers to bypass JavaScript API execution restrictions via unspecified vectors.
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Analysis
by VulDB Data Team • 10/17/2024
Adobe Reader and Acrobat versions prior to the mentioned patches contain a critical vulnerability that undermines the JavaScript security model implemented within the software. This vulnerability allows attackers to bypass restrictions that are normally enforced by the JavaScript API execution environment, effectively undermining the sandboxing mechanisms designed to prevent malicious code execution. The flaw exists in the way the software handles JavaScript API calls and validation processes, creating an execution path that bypasses normal security checks.
The technical nature of this vulnerability stems from insufficient validation of JavaScript API calls within the Adobe Acrobat environment. Attackers can exploit this weakness through unspecified vectors that likely involve crafting malicious JavaScript code or manipulating existing scripts to trigger unauthorized API access. This allows execution of restricted functions that should normally be prohibited, potentially enabling privilege escalation and arbitrary code execution. The vulnerability affects multiple product lines including the legacy 11.x versions, as well as the newer DC Classic and DC Continuous releases, indicating a widespread issue within the Adobe Acrobat ecosystem.
The operational impact of this vulnerability is significant as it provides attackers with elevated privileges within the Acrobat environment. Successful exploitation could allow adversaries to execute malicious JavaScript code that would normally be blocked by security restrictions, potentially leading to full system compromise. The vulnerability affects both Windows and OS X platforms, expanding the attack surface and making it relevant to a broad range of users. This type of vulnerability directly relates to CWE-250, which deals with execution of arbitrary code, and aligns with ATT&CK technique T1059.007 for JavaScript execution, representing a critical threat to enterprise security environments.
Organizations should immediately apply the security patches released by Adobe to address this vulnerability. The recommended mitigation includes updating to Adobe Reader and Acrobat versions 11.0.18, 15.006.30243, or 15.020.20039 respectively, depending on the product line in use. Additionally, implementing network-based security controls such as web application firewalls and monitoring for suspicious JavaScript activity can provide additional layers of protection. System administrators should also consider restricting JavaScript execution in Acrobat environments where possible, particularly in high-security environments where the risk of exploitation is elevated. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and highlights the risks associated with legacy software environments that may not receive continued security support.