CVE-2016-3384 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 9 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 09/23/2022
The vulnerability identified as CVE-2016-3384 represents a critical memory corruption flaw affecting Microsoft Internet Explorer versions 9 through 11. This vulnerability resides within the browser's handling of memory operations during web page rendering and script execution processes. The flaw enables remote attackers to craft malicious web pages that can trigger undefined behavior in the browser's memory management systems, potentially leading to arbitrary code execution or system instability. Security researchers classified this as a remote code execution vulnerability due to its ability to be exploited through web-based attacks without requiring local system access. The vulnerability specifically targets the browser's scripting engine and memory allocation mechanisms, creating conditions where attacker-controlled data can corrupt memory structures that the browser uses to manage web content.
The technical exploitation of CVE-2016-3384 occurs when Internet Explorer processes malformed or specially crafted web content that causes memory corruption within the browser's heap management system. This typically involves manipulating JavaScript objects or memory pointers in ways that bypass normal safety checks and validation mechanisms. The vulnerability can be triggered through various attack vectors including embedded scripts, dynamic content generation, or manipulation of DOM elements that force the browser to allocate or reallocate memory in unexpected patterns. The flaw operates at a low level within the browser's memory management subsystem, making it particularly dangerous as it can be leveraged to execute arbitrary code with the privileges of the user running the browser. This type of vulnerability falls under the CWE-125 weakness category, which specifically addresses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution.
From an operational impact perspective, CVE-2016-3384 poses significant risk to organizations relying on older Internet Explorer versions for business operations. The vulnerability can be exploited through drive-by downloads, malicious websites, or compromised web pages that users might visit during routine browsing activities. Security professionals note that the vulnerability's exploitability is enhanced by the widespread use of Internet Explorer in enterprise environments and the tendency of users to visit untrusted websites without proper security awareness. The memory corruption can manifest as browser crashes, application instability, or complete system compromise depending on the specific exploitation technique used. Organizations that have not migrated away from legacy IE versions face heightened risk of successful exploitation, as these older browsers lack modern security mitigations and are more susceptible to memory corruption attacks. The vulnerability's impact extends beyond individual user sessions to potentially affect entire network infrastructures if exploited at scale.
Mitigation strategies for CVE-2016-3384 primarily focus on immediate remediation through Microsoft's security updates and long-term architectural changes. Microsoft released security patches that address the memory corruption issue by strengthening input validation and memory management within the browser's JavaScript engine. Organizations should prioritize immediate deployment of the relevant security updates, as the vulnerability has been actively exploited in the wild. Browser isolation techniques, including the use of modern browser sandboxing features and virtualization, can provide additional protection layers against exploitation attempts. Network-based mitigations such as web application firewalls and content filtering systems can help reduce the risk of users encountering malicious websites. Security teams should implement comprehensive monitoring for exploitation attempts and establish incident response procedures specific to browser-based attacks. The vulnerability demonstrates the importance of maintaining up-to-date browser software and implementing defense-in-depth strategies that reduce the attack surface available to threat actors. Organizations should also consider migrating to more secure browser platforms and implementing browser hardening configurations that limit the potential impact of such vulnerabilities. The ATT&CK framework categorizes this vulnerability under the T1203 technique for exploitation of remote services, highlighting its potential for lateral movement and persistent access within compromised environments.