CVE-2016-3383 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 10 and 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Microsoft Browser Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 09/23/2022
Microsoft Internet Explorer 10 and 11 contained a critical memory corruption vulnerability that enabled remote attackers to execute arbitrary code or cause denial of service when users visited malicious websites. This vulnerability represented a significant security flaw in the browser's memory management and rendering engine, specifically affecting the way Internet Explorer handled certain web content. The issue stemmed from improper memory handling during web page processing, creating opportunities for attackers to manipulate memory structures and gain unauthorized system access. The vulnerability was classified under CWE-125 as an "Out-of-bounds Read" condition, where the browser failed to properly validate memory boundaries during content rendering. Attackers could craft malicious web pages that would trigger memory corruption when processed by the affected browsers, potentially allowing them to execute code with the privileges of the current user. The flaw was particularly dangerous because it could be exploited through standard web browsing activities without requiring any special privileges or user interaction beyond visiting the malicious site. This vulnerability directly mapped to attack techniques described in the MITRE ATT&CK framework under the T1059 category for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands on compromised systems.
The technical implementation of this vulnerability involved memory corruption within Internet Explorer's JavaScript engine and rendering components. When processing specially crafted web content, the browser would allocate memory buffers that were insufficient for the data being processed, leading to buffer overflows or memory corruption conditions. This type of flaw typically occurs when developers fail to properly validate input data or when memory management routines do not adequately check buffer boundaries before writing data. The memory corruption could manifest in various ways including heap corruption, stack corruption, or pointer corruption, all of which could be leveraged by attackers to redirect program execution flow. The vulnerability was particularly concerning because it affected widely deployed browser versions and could be exploited through standard web browsing scenarios. Attackers could craft malicious HTML pages containing JavaScript code that would trigger the memory corruption when rendered by the browser, potentially allowing them to inject and execute malicious code on the victim's system. The exploitation required no user interaction beyond visiting the malicious website, making it particularly dangerous in phishing campaigns or drive-by download scenarios. Security researchers noted that the vulnerability could be chained with other exploits to create more sophisticated attack vectors, potentially leading to full system compromise.
The operational impact of CVE-2016-3383 was substantial, affecting millions of users who relied on Internet Explorer 10 and 11 for their daily browsing activities. Organizations with legacy systems running these browser versions faced significant risk exposure, as the vulnerability could be exploited in targeted attacks against corporate networks. The vulnerability was particularly problematic in enterprise environments where Internet Explorer remained the default browser for legacy applications, creating extended attack surfaces for threat actors. The potential for remote code execution meant that attackers could establish persistent access to compromised systems, install malware, steal sensitive data, or use the compromised machines as launch points for further attacks. Organizations experienced increased security incidents and required urgent patch management procedures to address the vulnerability. The flaw also impacted user trust in Microsoft's security posture and highlighted the importance of timely security updates for widely used software applications. Incident response teams had to develop specific detection mechanisms to identify exploitation attempts and implement network monitoring to detect malicious web traffic targeting this vulnerability. The vulnerability demonstrated the critical need for continuous security assessments and proactive vulnerability management strategies in enterprise security programs.
Microsoft addressed this vulnerability through security update MS16-077, which provided patches for Internet Explorer 10 and 11 to correct the memory handling issues. Organizations were strongly advised to deploy these patches immediately to protect their systems from exploitation attempts. The fix involved modifying the browser's memory allocation and validation routines to properly handle edge cases in web content processing. Security professionals recommended implementing additional protective measures including browser hardening configurations, network-based protections, and user education to reduce the risk of successful exploitation. The vulnerability underscored the importance of maintaining up-to-date security patches and demonstrated how even widely used browsers could contain critical flaws. Organizations were advised to conduct comprehensive vulnerability assessments to identify systems running affected browser versions and prioritize patch deployment. The incident highlighted the need for robust security monitoring and incident response capabilities to detect and respond to exploitation attempts. Security vendors updated their threat intelligence feeds to include indicators of compromise related to this vulnerability, enabling organizations to detect potential exploitation attempts in their networks. The vulnerability also prompted discussions about browser security architecture and the need for more secure default configurations in web browsers to prevent similar issues in the future.