On versions 16.x before 16.1.0, 15.1.x before 15.1.4, 14.1.x before 14.1.4.4, and all versions of 13.1.x, 12.1.x, and 11.6.x, a reflected cross-site scripting (XSS) vulnerability exists in the resource information page for authenticated users when a full webtop is configured on the BIG-IP APM system. This vulnerability allows attackers to potentially manipulate content within the webtop environment.
The CVSS score for this vulnerability is 6.1, indicating a medium severity. The vulnerability’s attack vector is network-based, with low complexity and no privileges required, meaning that an attacker could exploit this vulnerability without needing to authenticate. User interaction is required, as the authenticated user must visit a malicious link that exploits the XSS flaw.
Organizations should prioritize patching immediately. The risk to organizations includes possible data exposure or alterations, especially since this vulnerability affects authenticated users directly interacting with the webtop.
Currently, there is no known public exploit for this vulnerability, and it is not listed in the Known Exploited Vulnerabilities (KEV) catalog. However, the potential for exploitation remains, especially given the nature of XSS vulnerabilities.
Vulnerability Details
This reflected XSS vulnerability is classified under CWE-79. The specific configurations affected include various versions of the F5 BIG-IP Access Policy Manager, making it crucial for organizations to assess their systems and apply necessary patches.
Organizations using versions 11.6.x, 12.1.x, 13.1.x, 14.1.x, 15.1.x, and 16.x must take immediate action to remediate this vulnerability. The vulnerability was published on September 27, 2021.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of user input on the resource information page, allowing attackers to inject malicious scripts. The attack vector is primarily network-based, and it requires user interaction, as the victim must click on a crafted link to trigger the XSS payload.
The complexity of the attack is low, as no authentication is required from the attacker, making it easier for them to exploit the vulnerability. The implications of a successful attack could lead to unauthorized actions being performed on behalf of authenticated users, potentially compromising sensitive information.
Risk & Impact Analysis
Risk to organizations includes potential data theft or manipulation, which can have severe implications for business operations and customer trust. The fact that this vulnerability affects authenticated users increases its risk profile, as attackers could exploit it to gain further access to sensitive systems.
Given the CVSS score of 6.1, organizations should assess their exposure and prioritize remediation efforts within their security patch cycles. The low EPS score of 0.0044 indicates a relatively low chance of exploitation in the wild, but organizations should not become complacent.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the F5 BIG-IP Access Policy Manager include:
• 11.6.x (11.6.1 to 11.6.5) • 12.1.x (12.1.0 to 12.1.6) • 13.1.x (13.1.0 to 13.1.4) • 14.1.x (14.1.0 to 14.1.4.4) • 15.1.x (15.1.0 to 15.1.4) • 16.0.x (16.0.0 to 16.0.1)
Mitigation & Remediation
Organizations should apply relevant patches to their F5 BIG-IP Access Policy Manager systems. The vendor has provided guidance on mitigation strategies, which can be found in their advisory. For comprehensive security, organizations should also consider implementing web application firewalls and regular security assessments.
For more information on security measures, organizations can refer to the penetration testing services available.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual user interactions, particularly those involving the resource information page. Additionally, behavioral anomalies in user sessions may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing risks associated with XSS flaws, especially within widely used enterprise applications. Security teams are reminded to prioritize regular updates and audits of webtop configurations.
For a deeper understanding of vulnerability management, organizations are encouraged to explore our vulnerability management program design.
Moreover, understanding penetration testing methodologies can aid in identifying and mitigating risks posed by vulnerabilities like CVE-2021-23054. To learn more, consider our penetration testing methodology resource.
Lastly, as organizations enhance their security posture, it is essential to stay informed about evolving threats and best practices in the industry. Refer to our security testing best practices guide.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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