CVE-2018-5745: An assertion failure can occur if a trust anchor rolls over to an unsupported key algorithm when using managed-keys

Published Feb 20, 2019

Updated

"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.

Other sources

A flaw was found in Bind. 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 causing denial of service.

— Red Hat

ISC BIND is vulnerable to a denial of service, caused by an error in the managed-keys feature. By replacing a trust anchor's keys with keys which use an unsupported algorithm, a remote authenticated attacker could exploit this vulnerability to cause an assertion failure.

— IBM

Affected Software

15 affected componentsFixes available

redhat/bind<9.11.5

9.11.5

redhat/bind<9.12.3

9.12.3

IBM Data Risk Manager<=2.0.6

ISC BIND>=9.9.0<=9.10.7

ISC BIND>=9.11.0<=9.11.4

ISC BIND>=9.12.0<=9.12.2

ISC BIND>=9.13.0<=9.13.6

ISC Bind Supported Preview=9.9.3-s1

ISC BIND=9.10.7

ISC BIND=9.10.8-p1

ISC BIND=9.11.5

ISC BIND=9.11.5-p1

ISC Bind Supported Preview=9.11.5-s3

ISC BIND=9.12.3

ISC BIND=9.12.3-p1

Remediation

Information

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

Event History

Oct 9, 2019

CVE Published

via MITRE·02:17 PM

Data Sourced

via MITRE·02:17 PM

RemedyDescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

IBM-6335281

Frequently Asked Questions

What is the severity of CVE-2018-5745?

CVE-2018-5745 is classified as a denial-of-service vulnerability that can lead to assertion failures in ISC BIND.

How do I fix CVE-2018-5745?

To mitigate CVE-2018-5745, upgrade ISC BIND to version 9.11.5 or 9.12.3 or apply the necessary patches.

Which versions of ISC BIND are affected by CVE-2018-5745?

CVE-2018-5745 affects versions of ISC BIND from 9.9.0 up to and including 9.12.2.

Can CVE-2018-5745 be exploited remotely?

Yes, CVE-2018-5745 can be exploited remotely by an authenticated attacker.

Is CVE-2018-5745 related to key management in ISC BIND?

Yes, CVE-2018-5745 is related to an error in the managed-keys feature of ISC BIND.