CVE-2019-10163 : Security Advisory and Response
Discover the impact of CVE-2019-10163 affecting PowerDNS Authoritative Server versions 4.1.9 and 4.0.8. Learn about the vulnerability, its technical details, and mitigation steps.
A security flaw has been discovered in versions 4.1.9 and 4.0.8 of the PowerDNS Authoritative Server, allowing a remote master server to disrupt slave zones' update process or overload the CPU.
Understanding CVE-2019-10163
This CVE involves a vulnerability in PowerDNS Authoritative Server versions 4.1.9 and 4.0.8 that can be exploited by an authorized remote master server to disrupt slave zones' update process or cause CPU overload.
What is CVE-2019-10163?
The vulnerability in PowerDNS Authoritative Server versions 4.1.9 and 4.0.8 allows a remote master server to disrupt the update process of slave zones or overload the CPU by sending a large volume of NOTIFY messages.
The Impact of CVE-2019-10163
- CVSS Score: 3.5 (Low)
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: Low
- User Interaction: Required
- Scope: Unchanged
- Confidentiality Impact: None
- Integrity Impact: None
- Availability Impact: Low
Technical Details of CVE-2019-10163
Vulnerability Description
The vulnerability in PowerDNS Authoritative Server versions 4.1.9 and 4.0.8 allows a remote master server to disrupt slave zones' update process or overload the CPU by sending a significant volume of NOTIFY messages.
Affected Systems and Versions
- Affected Product: PowerDNS
- Vendor: PowerDNS
- Affected Versions: Fixed in 4.1.9, Fixed in 4.0.8
Exploitation Mechanism
The vulnerability can be exploited by an authorized remote master server to disrupt slave zones' update process or overload the CPU by sending a large number of NOTIFY messages.
Mitigation and Prevention
Immediate Steps to Take
- Update PowerDNS Authoritative Server to version 4.1.9 or 4.0.8, where the vulnerability is fixed.
- Monitor network traffic for any unusual patterns that may indicate exploitation.
Long-Term Security Practices
- Regularly update and patch all software to prevent known vulnerabilities.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
- Apply patches and updates provided by PowerDNS to address the vulnerability and enhance system security.