A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Adaptive_security_appliance | Cisco | * | 9.6.4.35 (excluding) |
| Firepower_threat_defense | Cisco | * | 6.3.0.6 (excluding) |
| Firepower_threat_defense | Cisco | 6.4.0 (including) | 6.4.0.10 (excluding) |
| Firepower_threat_defense | Cisco | 6.5.0 (including) | 6.5.0.5 (excluding) |
| Firepower_threat_defense | Cisco | 6.6.0 (including) | 6.6.1 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.8.0 (including) | 9.8.4.20 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.9.0 (including) | 9.9.2.80 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.10.0 (including) | 9.10.1.43 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.12.0 (including) | 9.12.3.9 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.13.0 (including) | 9.13.1.10 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.14.0 (including) | 9.14.1.10 (excluding) |