CVE-2016-3206 in Internet Explorer
Summary
by MITRE
The Microsoft (1) JScript 5.8 and (2) VBScript 5.7 and 5.8 engines, as used in Internet Explorer 9 through 11 and other products, allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Scripting Engine Memory Corruption Vulnerability," a different vulnerability than CVE-2016-3205 and CVE-2016-3207.
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Analysis
by VulDB Data Team • 08/24/2022
This vulnerability represents a critical memory corruption flaw affecting Microsoft's scripting engines within Internet Explorer versions 9 through 11. The issue specifically impacts JScript 5.8 and VBScript 5.7 and 5.8 implementations, creating a pathway for remote code execution through malicious web content. Security researchers identified this as distinct from related vulnerabilities CVE-2016-3205 and CVE-2016-3207, establishing it as a separate but equally dangerous flaw in Microsoft's browser scripting architecture. The vulnerability operates by exploiting memory handling mechanisms within the scripting engines, potentially allowing attackers to manipulate memory addresses and execute arbitrary code on vulnerable systems.
The technical exploitation occurs when a malicious website delivers crafted script content that triggers improper memory management within the JScript or VBScript engines. This memory corruption can manifest as heap corruption or stack overflow conditions that attackers can leverage to gain control over the affected system. The vulnerability's impact extends beyond simple code execution to include potential denial of service scenarios where system stability is compromised. According to CWE classification, this vulnerability maps to CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write, reflecting the memory access violations that occur during normal script execution. The ATT&CK framework categorizes this under T1059.007: Command and Scripting Interpreter - JavaScript, highlighting the exploitation techniques targeting scripting engine vulnerabilities.
The operational impact of this vulnerability is severe given that Internet Explorer 9 through 11 were widely deployed across enterprise environments and consumer systems. Attackers could leverage this flaw through drive-by download scenarios or malicious web pages that automatically execute the malicious script when users visit compromised sites. The vulnerability's persistence across multiple IE versions means that organizations needed to implement immediate patching strategies or alternative browser security measures. The memory corruption nature makes detection difficult as it may not immediately manifest as a clear error condition, allowing attackers to maintain persistence on compromised systems. Organizations with legacy systems running these older IE versions faced significant risk exposure, as the vulnerability could be exploited through various attack vectors including social engineering campaigns that directed users to malicious websites.
Mitigation strategies for this vulnerability required immediate patch deployment through Microsoft's security updates, as the flaw represented a critical security risk that could be exploited without user interaction. Organizations needed to implement browser hardening measures including disabling script execution in Internet Explorer, implementing enhanced security zones, and deploying additional network security controls. The vulnerability's classification as a remote code execution flaw necessitated comprehensive endpoint protection measures, including behavior monitoring for suspicious script execution patterns. Security teams should have implemented network segmentation to limit the potential impact of successful exploitation and deployed intrusion detection systems to monitor for exploitation attempts. Regular vulnerability assessments and patch management processes became critical for maintaining system security against similar scripting engine vulnerabilities. Additionally, user education programs emphasizing safe browsing practices and the dangers of visiting untrusted websites helped reduce exploitation success rates. The incident highlighted the importance of maintaining up-to-date security patches and implementing layered security approaches to protect against complex exploitation techniques targeting browser scripting engines.