CVE-2019-25036 Explained : Impact and Mitigation
Learn about CVE-2019-25036, an Unbound vulnerability disputed by the vendor. Find out the impact, affected versions, and mitigation steps for this assertion failure and denial-of-service issue.
Unbound versions prior to 1.9.5 are susceptible to an assertion failure and denial-of-service vulnerability in synth_cname. The vendor disputes the classification of this issue as a vulnerability, stating that while the code could be compromised, it is not exploitable in a running Unbound installation.
Understanding CVE-2019-25036
Unbound vulnerability with disputed classification.
What is CVE-2019-25036?
Unbound before version 1.9.5 is at risk of an assertion failure and denial-of-service vulnerability in synth_cname. The vendor disagrees with its classification as a vulnerability, claiming it cannot be exploited in a running Unbound installation.
The Impact of CVE-2019-25036
- Assertion failure and denial-of-service vulnerability in Unbound versions prior to 1.9.5.
- Disputed classification as a vulnerability by the vendor.
Technical Details of CVE-2019-25036
Unbound vulnerability details.
Vulnerability Description
Unbound before version 1.9.5 is prone to an assertion failure and denial-of-service vulnerability in synth_cname.
Affected Systems and Versions
- Unbound versions prior to 1.9.5.
Exploitation Mechanism
- The code may be potentially compromised, but exploitation is not feasible in a running Unbound installation.
Mitigation and Prevention
Steps to address the CVE-2019-25036 vulnerability.
Immediate Steps to Take
- Update Unbound to version 1.9.5 or newer.
- Monitor vendor communications for any updates or changes regarding the vulnerability.
Long-Term Security Practices
- Regularly update and patch Unbound to the latest versions.
- Follow security best practices to secure DNS servers.
Patching and Updates
- Apply patches and updates provided by the vendor to address the vulnerability.