CVE-2021-4102 is a high-severity vulnerability classified as a use-after-free in the V8 engine of Google Chrome. This vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. Since this issue affects all versions of Chrome prior to 96.0.4664.110, it poses a significant risk to users and organizations relying on this browser for web access.
The CVSS score for this vulnerability is 8.8, indicating a high level of risk. The vulnerability can be exploited through network access, with low attack complexity, meaning that attackers do not need sophisticated techniques to exploit it. Moreover, the attack requires user interaction, which increases the potential for exploitation in environments where users are encouraged to visit various websites.
Risk to organizations includes unauthorized access to sensitive information, potential data integrity issues, and service disruptions. As the vulnerability allows for high impacts on confidentiality, integrity, and availability, organizations must prioritize remediation actions to mitigate this risk. Urgency for defenders is critical, especially given the ease of exploitation and the wide usage of Google Chrome in enterprise environments.
Organizations should prioritize patching immediately to safeguard against this vulnerability. As this issue is included in the Known Exploited Vulnerabilities (KEV) catalog, it underscores the importance of proactive security measures.
Vulnerability Details
The vulnerability is described as a use-after-free in V8 in Google Chrome versions prior to 96.0.4664.110. This vulnerability allows a remote attacker to potentially exploit heap corruption via a crafted HTML page. The official CWE classification for this vulnerability is CWE-416.
Google released the vulnerability on February 11, 2022, and it has been analyzed for its impact and exploitability. The CVSS score of 8.8 reflects the high severity of the issue, emphasizing the need for immediate action from affected organizations.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of memory in the V8 engine, which results in the use of previously freed memory. Attackers may leverage this vulnerability by crafting malicious HTML content that, when rendered by the browser, could lead to heap corruption. The attack vector is network-based, requiring users to visit a compromised or malicious site.
The attack complexity is low, as no special privileges are required to exploit this vulnerability. However, user interaction is necessary, as the victim must load the malicious HTML content in their browser for the exploit to succeed. The impact on confidentiality, integrity, and availability is all rated as high, indicating that successful exploitation could lead to serious consequences.
Risk & Impact Analysis
The deployment risk for organizations using Google Chrome is significant due to the widespread use of the browser. Organizations that have not yet patched their systems are vulnerable to exploitation, leading to potential data breaches and unauthorized access to sensitive information. The blast radius for this vulnerability could extend across entire organizations if users are not educated about safe browsing practices.
Given the CVSS score of 8.8 and its inclusion in the KEV catalog, organizations should assess their environments for exposure and prioritize remediation actions accordingly. The urgency is critical, as attackers are likely to exploit this vulnerability actively in the wild.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
All versions of Google Chrome prior to 96.0.4664.110 are affected by this vulnerability. Organizations should verify their installed versions to ensure they are running an updated version to mitigate the risk.
Mitigation & Remediation
To address this vulnerability, organizations should apply the latest updates provided by Google. The specific version to upgrade to is 96.0.4664.110 or later. If a patch cannot be applied immediately, organizations should consider implementing workarounds such as restricting access to potentially harmful websites or monitoring user interactions with the browser.
For further security, organizations can utilize services like continuous penetration testing to identify and remediate any similar weaknesses.
Detection Guidance
Organizations should monitor logs for unusual behavior or attempts to access known malicious sites. Behavioral anomalies in browser access patterns can also indicate potential exploitation attempts. Additionally, implementing network signatures to detect unusual traffic can help in early detection.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-4102 highlights the ongoing challenges in managing vulnerabilities within widely used software like Google Chrome. This vulnerability represents a pattern of use-after-free issues that can lead to severe impacts if not managed properly.
Security teams must remain vigilant and proactive in monitoring for such vulnerabilities. The lessons learned from this incident should inform future development and security practices, ensuring that similar weaknesses are identified and addressed promptly.
For more insights into managing vulnerabilities, organizations can explore resources such as the vulnerability management program or the penetration testing methodology that provide strategies for proactive security measures.
Organizations should also consider leveraging red teaming services to simulate attacks and assess their defenses against such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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