CVE-2019-1706 Explained : Impact and Mitigation
Learn about CVE-2019-1706, a high-severity vulnerability in Cisco ASA Software allowing remote attackers to trigger a denial of service attack. Find mitigation steps and patching details here.
Cisco Adaptive Security Appliance Software IPsec Denial of Service Vulnerability
Understanding CVE-2019-1706
This CVE involves a flaw in the software cryptography module of Cisco Adaptive Security Virtual Appliance (ASAv) and Firepower 2100 Series running Cisco Adaptive Security Appliance (ASA) Software, potentially leading to a denial of service (DoS) attack.
What is CVE-2019-1706?
The vulnerability allows an unauthenticated remote attacker to force a device reload by exploiting a logic error in handling IPsec sessions, resulting in a DoS situation.
The Impact of CVE-2019-1706
- Severity: High (CVSS Base Score: 8.6)
- Attack Vector: Network
- Availability Impact: High
- Scope: Changed
- No user interaction or privileges required
Technical Details of CVE-2019-1706
The following technical details provide insight into the vulnerability.
Vulnerability Description
The flaw in the software cryptography module allows attackers to overload IPsec sessions, causing the device to reload unexpectedly and leading to a DoS condition.
Affected Systems and Versions
- Product: Cisco Adaptive Security Appliance (ASA) Software
- Vendor: Cisco
- Versions Affected: Less than 9.9.2.50 (unspecified version type)
Exploitation Mechanism
Attackers can exploit the vulnerability by generating and transmitting a large volume of traffic in IPsec sessions through the targeted device, triggering a reload and DoS condition.
Mitigation and Prevention
Protecting systems from CVE-2019-1706 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly.
- Monitor network traffic for any unusual IPsec session activities.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly update and patch all software and firmware.
- Conduct security assessments and penetration testing to identify vulnerabilities.
- Educate users and IT staff on best security practices to prevent and respond to cyber threats.
Patching and Updates
- Cisco has released patches to address the vulnerability. Ensure all affected systems are updated to versions beyond 9.9.2.50 to mitigate the risk of exploitation.