CVE-2022-21970 in Edge
Summary
by MITRE • 01/12/2022
Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability. This CVE ID is unique from CVE-2022-21954.
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Analysis
by VulDB Data Team • 01/15/2022
This vulnerability represents a critical elevation of privilege flaw in Microsoft Edge browsers based on the Chromium engine, specifically affecting versions prior to the security updates released in February 2022. The flaw resides in how the browser handles certain memory management operations within its rendering engine, creating an opportunity for malicious actors to escalate their privileges from a standard user context to that of a system administrator. The vulnerability stems from improper validation of memory access patterns during the processing of web content, particularly when handling complex JavaScript operations and DOM manipulations that interact with the browser's underlying memory structures. Security researchers identified that when Edge processes certain types of web pages containing crafted malicious code, the browser fails to properly enforce memory isolation boundaries, allowing attackers to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability involves a memory corruption issue that occurs during the handling of specific JavaScript object interactions within the browser's V8 JavaScript engine. When a malicious web page attempts to exploit this flaw through carefully constructed JavaScript code, it can manipulate memory pointers and overwrite critical system structures. The vulnerability operates at the intersection of memory safety and privilege separation mechanisms, where the browser's sandboxing controls fail to properly isolate malicious code execution from the underlying operating system resources. This type of vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow conditions, though the specific implementation involves more complex memory management issues. The flaw demonstrates how modern browser security architectures can be compromised when memory management operations are not properly validated, creating pathways for privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple browser exploitation, as it can enable attackers to gain complete control over affected systems. Once successfully exploited, the vulnerability allows malicious actors to install persistent backdoors, modify system files, access sensitive data, and potentially establish footholds for further network infiltration. The attack surface is particularly concerning because it leverages the browser as an initial access vector, which is one of the most common entry points for enterprise security breaches. Organizations running affected Edge versions face significant risk of data compromise and system takeover, especially in environments where users have administrative privileges or where browser-based attacks are common. This vulnerability also aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1068, which addresses exploit for privilege escalation, making it a critical concern for security teams implementing comprehensive threat hunting strategies.
Mitigation strategies for this vulnerability require immediate deployment of Microsoft's security patches and updates, which address the memory corruption issues through enhanced validation mechanisms and improved memory access controls. Organizations should implement browser hardening measures including disabling unnecessary browser features, implementing strict content security policies, and deploying web application firewalls to filter malicious content. Additionally, security teams should conduct regular vulnerability assessments focusing on browser-based attack surfaces and implement monitoring solutions to detect anomalous behavior patterns that might indicate exploitation attempts. The remediation process should include comprehensive testing of patched environments to ensure that the security updates do not introduce compatibility issues with existing applications while maintaining the necessary protection against privilege escalation attacks. Regular security awareness training for users about the dangers of visiting untrusted websites and downloading suspicious content remains essential in defending against this type of vulnerability exploitation.