CVE-2016-0071 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 9 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."
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/07/2022
Microsoft Internet Explorer 9 contains a critical memory corruption vulnerability that enables remote attackers to execute arbitrary code or cause denial of service when users visit malicious websites. This vulnerability stems from improper handling of memory structures during web page rendering processes, creating exploitable conditions that can be leveraged by threat actors. The flaw exists within the browser's scripting engine and memory management subsystem, making it particularly dangerous as it can be triggered through routine web browsing activities without any special privileges or user interaction beyond visiting a compromised site.
The technical nature of this vulnerability involves heap-based memory corruption that occurs when Internet Explorer processes specially crafted HTML content containing malicious JavaScript or ActiveX controls. Attackers can manipulate memory pointers and buffer boundaries to overwrite critical system memory locations, potentially leading to arbitrary code execution with the privileges of the logged-in user. This type of vulnerability falls under CWE-121, heap-based buffer overflow, and represents a classic example of memory safety issues that have plagued web browsers for decades. The vulnerability is particularly concerning because it can be exploited through social engineering techniques where users are directed to malicious websites through phishing campaigns, drive-by downloads, or compromised advertising networks.
The operational impact of CVE-2016-0071 extends beyond simple remote code execution to include significant system compromise and potential data exfiltration capabilities. When successfully exploited, this vulnerability can allow attackers to install malware, modify system files, establish persistence mechanisms, and potentially escalate privileges to system-level access. Organizations running Internet Explorer 9 are particularly vulnerable as this browser version lacks modern security mitigations such as address space layout randomization and data execution prevention that are standard in newer browser versions. The vulnerability also aligns with ATT&CK technique T1203, "Exploitation for Client Execution," and T1059, "Command and Scripting Interpreter," as it enables attackers to execute malicious code through legitimate browser interfaces.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft's security patches and updates, which address the underlying memory corruption issues through improved memory management and input validation. Organizations should implement browser hardening measures such as disabling unnecessary ActiveX controls, restricting JavaScript execution in sensitive environments, and deploying application whitelisting solutions to prevent exploitation. Additionally, network-based protections including web application firewalls and intrusion detection systems can help detect and block malicious traffic patterns associated with exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date software and implementing layered security approaches to protect against sophisticated browser-based attacks. Regular security assessments and user education regarding safe browsing practices remain essential components of comprehensive defense strategies against such exploits.