Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in the WebVPN login page of Cisco Adaptive Security Appliance (ASA) Software. This flaw allows remote attackers to introduce malicious web script or HTML into the affected system. Such an injection could compromise the integrity of the web application and potentially impact user sessions.
- Cisco Adaptive Security Appliance Software
- Cross-site scripting flaw
- Compromised web application integrity
Attack Path
How an attacker could exploit the issue
A cross-site scripting vulnerability exists in the WebVPN login page of Cisco Adaptive Security Appliance Software. This allows remote attackers to inject malicious scripts or HTML into the affected system. The vulnerability is triggered when an attacker crafts a specific request containing arbitrary web script or HTML. This could lead to unauthorized actions or information disclosure within the context of the affected user's session.
- Exposure condition: WebVPN login page is accessible.
- Attacker starting point: Network.
- Trigger and result: Inject script, affect user session.
Live Threat
Current exploitation, exposure, and threat context
A cross-site scripting vulnerability exists in the WebVPN login page of Cisco Adaptive Security Appliance (ASA) Software. This flaw allows remote attackers to inject arbitrary web scripts or HTML. The vulnerability has been documented and added to the U.S. Cybersecurity and Infrastructure Security Agency's (CISA) Known Exploited Vulnerabilities catalog, indicating active exploitation and a potential risk to organizations.
- Attackers with low skill can exploit.
- Remote access to the login page is needed.
- Business risk is high, requiring urgent attention.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability may allow attackers to inject malicious scripts into affected systems. Organizations should prioritize identifying and securing any exposed Cisco Adaptive Security Appliance (ASA) WebVPN login pages. The vendor has provided a security notice with recommended actions, and applying the vendor-supplied fix is crucial. Following these steps will help mitigate the risk to systems and data.
- Identify exposed login pages.
- Limit access to WebVPN.
- Apply vendor fix and verify.
