CVE-2018-5745

An assertion failure can occur if a trust anchor rolls over to an unsupported key algorithm when using managed-keys

Description

"managed-keys" is a feature which allows a BIND resolver to automatically maintain the keys used by trust anchors which operators configure for use in DNSSEC validation. Due to an error in the managed-keys feature it is possible for a BIND server which uses managed-keys to exit due to an assertion failure if, during key rollover, a trust anchor's keys are replaced with keys which use an unsupported algorithm. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P1, 9.12.0 -> 9.12.3-P1, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5745.

Remediation

Solution:

  • Upgrade to a version of BIND containing a fix preventing the assertion failure. >= BIND 9.11.5-P4 >= BIND 9.12.3-P4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. >= BIND 9.11.5-S5

Category

4.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.56%
Vendor Advisory redhat.com
Affected: ISC BIND 9
Published at:
Updated at:

References

Link Tags
https://kb.isc.org/docs/cve-2018-5745 third party advisory
https://access.redhat.com/errata/RHSA-2019:3552 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-5745?
CVE-2018-5745 has been scored as a medium severity vulnerability.
How to fix CVE-2018-5745?
To fix CVE-2018-5745: Upgrade to a version of BIND containing a fix preventing the assertion failure. >= BIND 9.11.5-P4 >= BIND 9.12.3-P4 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. >= BIND 9.11.5-S5
Is CVE-2018-5745 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-5745 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-5745?
CVE-2018-5745 affects ISC BIND 9.
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