CVE-2019-1693 : Security Advisory and Response
Learn about CVE-2019-1693 affecting Cisco ASA and FTD Software. Discover the impact, affected versions, and mitigation steps to prevent WebVPN DoS attacks.
A flaw in the WebVPN service of Cisco ASA Software and Cisco FTD Software allows a remote attacker to create a denial of service (DoS) situation by exploiting authenticated sessions within the WebVPN portal.
Understanding CVE-2019-1693
This CVE involves a vulnerability in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software that could lead to a DoS attack.
What is CVE-2019-1693?
The vulnerability stems from inadequate handling of authenticated sessions in the WebVPN portal, enabling an attacker with valid credentials to trigger a device restart, causing a temporary DoS state.
The Impact of CVE-2019-1693
- CVSS Base Score: 7.7 (High)
- Attack Vector: Network
- Availability Impact: High
- Attack Complexity: Low
- Privileges Required: Low
- Scope: Changed
Technical Details of CVE-2019-1693
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The flaw allows an authenticated attacker to exploit the WebVPN service, inducing a DoS condition by manipulating authenticated sessions.
Affected Systems and Versions
- Cisco Adaptive Security Appliance (ASA) Software:
- Versions less than 9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17
- Cisco Firepower Threat Defense (FTD) Software:
- Versions less than 6.2.3.12, 6.3.0.3
Exploitation Mechanism
The attacker needs valid credentials to access a specific URL in the WebVPN portal to exploit the vulnerability and cause a device restart.
Mitigation and Prevention
Protect your systems from CVE-2019-1693 with these mitigation strategies.
Immediate Steps to Take
- Apply vendor-released patches promptly
- Monitor network traffic for any suspicious activity
- Restrict access to the WebVPN portal to authorized users
Long-Term Security Practices
- Regularly update and patch all software and firmware
- Conduct security training for employees to recognize phishing attempts
- Implement network segmentation to limit the impact of potential attacks
Patching and Updates
- Cisco has released patches to address the vulnerability
- Ensure all affected systems are updated with the latest security fixes