CVE-2021-23037 is a critical reflected cross-site scripting (XSS) vulnerability affecting multiple versions of F5 BIG-IP products, including 16.1.x, 16.0.x, 15.1.x, 14.1.x, 13.1.x, 12.1.x, and 11.6.x. This vulnerability allows an attacker to execute JavaScript in the context of a currently logged-in user through an undisclosed page of the BIG-IP Configuration utility. The severe nature of this vulnerability, with a CVSS score of 9.6, emphasizes the need for immediate action from organizations using affected versions.
Risk to organizations includes potential unauthorized actions being performed on behalf of users, leading to data breaches, session hijacking, or other malicious activities. The critical severity of this vulnerability necessitates that organizations prioritize patching immediately.
As of now, there is no confirmed public exploit or proof of concept (PoC) available, but the nature of XSS vulnerabilities means that the absence of known exploits does not mitigate the risk. Organizations should remain vigilant.
Given the severity of this vulnerability, organizations must take immediate steps to address it. Timely patching of affected systems is crucial to maintaining security and protecting sensitive data.
Vulnerability Details
This vulnerability allows an attacker to execute JavaScript in the context of the currently logged-in user. The CVSS score of 9.6 indicates that it falls under the critical category, with high impacts on confidentiality, integrity, and availability. The vulnerability affects the following F5 products and versions: BIG-IP Access Policy Manager (11.6.x to 11.6.5, 12.1.x to 12.1.6, 13.1.x to 13.1.4, 14.1.x to 14.1.4, 15.1.x to 15.1.3, 16.0.x to 16.1.0), and others similarly listed.
Technical Analysis
The root cause of this vulnerability stems from inadequate validation of user input, allowing for the injection of malicious scripts. The attack vector is network-based, and the attack complexity is low, requiring no special privileges but necessitating user interaction. The impact on confidentiality, integrity, and availability is high, making this vulnerability particularly dangerous.
Risk & Impact Analysis
Organizations deploying F5's BIG-IP products are at significant risk if this vulnerability is not remediated. The potential for exploitation could lead to data loss or exposure, unauthorized actions, and damage to reputation. The urgency is underscored by the critical CVSS score, warranting immediate attention. Organizations should assess their exposure and take appropriate measures to patch or mitigate the vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of F5 BIG-IP, including but not limited to: BIG-IP Access Policy Manager, BIG-IP Advanced Firewall Manager, and BIG-IP Application Security Manager across multiple versions (11.6.x through 16.1.x). Organizations should assume all versions prior to vendor patch are vulnerable.
Mitigation & Remediation
F5 has released patches for the affected products. Organizations should ensure they are running the latest versions of the F5 BIG-IP software. For further details, organizations can refer to the vendor's mitigation guidance. Additionally, implementing web application firewalls and security monitoring can help mitigate the risk until patches are applied. Regular security assessments including penetration testing can also help identify similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for unusual script execution or unexpected behavior in the BIG-IP Configuration utility. Anomalies in user session activities should also be investigated promptly. Effective monitoring solutions can help detect and respond to exploitation attempts.
AppSecure Threat Intelligence Insight
The critical nature of this vulnerability highlights the necessity for robust security practices in web application management. It underscores the importance of regular updates and vulnerability assessments. Organizations must learn from such vulnerabilities to strengthen their defenses, ensuring that they are not only reactive but proactive in their security strategies. For detailed guidance, organizations can explore our resources on vulnerability management programs and penetration testing methodologies to enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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