CVE-2020-25648 : Security Advisory and Response
Learn about CVE-2020-25648, a flaw in NSS affecting TLS 1.3, allowing remote attackers to cause denial of service. Find mitigation steps and update recommendations here.
A flaw in the Network Security Services (NSS) library allows a remote attacker to cause a denial of service in servers using TLS 1.3. This vulnerability affects NSS versions before 3.58.
Understanding CVE-2020-25648
What is CVE-2020-25648?
This CVE identifies a vulnerability in the way NSS handles CCS messages in TLS 1.3, potentially leading to a denial of service attack.
The Impact of CVE-2020-25648
The primary impact of this vulnerability is on system availability, particularly for servers compiled with the affected NSS library version.
Technical Details of CVE-2020-25648
Vulnerability Description
The flaw in NSS allows a remote attacker to send multiple CCS messages, triggering a denial of service condition in servers using affected NSS versions.
Affected Systems and Versions
- Vendor: n/a
- Product: NSS
- Affected Versions: NSS versions before 3.58
Exploitation Mechanism
The vulnerability can be exploited by sending multiple CCS messages in TLS 1.3, targeting servers using vulnerable NSS versions.
Mitigation and Prevention
Immediate Steps to Take
- Update NSS to version 3.58 or later to mitigate the vulnerability.
- Monitor for any unusual CCS message activity that could indicate a potential attack.
Long-Term Security Practices
- Regularly update and patch software components like NSS to address known vulnerabilities.
- Implement network monitoring to detect and respond to abnormal traffic patterns.
Patching and Updates
- Apply security updates provided by NSS to ensure protection against known vulnerabilities.