CVE-2018-5737 : Vulnerability Insights and Analysis
Learn about CVE-2018-5737, a vulnerability in BIND 9.12 that can lead to assertion failures and operational difficulties. Find mitigation steps and the impact of the vulnerability.
BIND 9.12's serve-stale implementation can cause an assertion failure in rbtdb.c or other undesirable behavior, even if serve-stale is not enabled.
Understanding CVE-2018-5737
An issue in BIND 9.12 can lead to an assertion failure in rbtdb.c due to the serve-stale feature, potentially causing operational difficulties.
What is CVE-2018-5737?
- Problematic interaction between serve-stale feature and NSEC aggressive negative caching in BIND 9.12
- Vulnerability affects versions 9.12.0 and 9.12.1
- Exploitation could result in service degradation or denial
The Impact of CVE-2018-5737
- CVSS v3.0 Base Score: 5.9 (Medium Severity)
- Attack Vector: Network
- Availability Impact: High
- No impact on Confidentiality or Integrity
Technical Details of CVE-2018-5737
BIND 9.12 vulnerability details
Vulnerability Description
- Failure assertion in rbtdb.c due to serve-stale feature
- Potential recursion loop or excessive logging in named
Affected Systems and Versions
- BIND versions 9.12.0 and 9.12.1
Exploitation Mechanism
- Interaction between serve-stale feature and NSEC aggressive negative caching
Mitigation and Prevention
Protecting systems from CVE-2018-5737
Immediate Steps to Take
- Upgrade to BIND 9.12.1-P2 if running affected versions
- Set "max-stale-ttl 0;" in named.conf to prevent exploitation
Long-Term Security Practices
- Regularly update BIND to the latest version
- Monitor security advisories for BIND
Patching and Updates
- Apply patches promptly to address vulnerabilities