CVE-2019-6474 : Exploit Details and Defense Strategies
Learn about CVE-2019-6474, a Kea server vulnerability that can cause restart issues. Find out how to mitigate the impact and prevent exploitation. Upgrade to fixed versions for protection.
A vulnerability in the validation process of incoming client requests in Kea servers could lead to the server mistakenly terminating the restart process due to an issue with its lease store.
Understanding CVE-2019-6474
This CVE involves a vulnerability in Kea servers that can be exploited to cause server restart issues.
What is CVE-2019-6474?
This CVE pertains to a flaw in the Kea server's validation process that can result in the server incorrectly terminating the restart process.
The Impact of CVE-2019-6474
The vulnerability can lead to servers failing to restart properly, affecting the availability of DHCP services.
Technical Details of CVE-2019-6474
This section provides technical details of the CVE.
Vulnerability Description
The vulnerability allows for the creation of invalid leases in the Kea server's lease storage, causing restart issues.
Affected Systems and Versions
- Affected versions: 1.4.0 to 1.5.0, 1.6.0-beta1, 1.6.0-beta2
- Only Kea servers using memfile storage for leases are impacted.
Exploitation Mechanism
An attacker can exploit the missing check in incoming client requests to disrupt the server's restart process.
Mitigation and Prevention
Protect your systems from CVE-2019-6474 with the following steps:
Immediate Steps to Take
- Upgrade to fixed versions: Kea 1.4.0-P2, Kea 1.5.0-P1, Kea 1.6.0
Long-Term Security Practices
- Regularly update Kea servers to the latest versions
- Implement network security measures to detect and prevent malicious activities
Patching and Updates
- Download the fixed versions from ISC's official website