Public Date:
1655844: CVE-2018-5742 bind: Crash from assertion error when debug log level is 10 and log entries meet buffer boundary

The MITRE CVE dictionary describes this issue as:

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Find out more about CVE-2018-5742 from the MITRE CVE dictionary dictionary and NIST NVD.


This flaw appears to be exploitable only when debug logging is enabled and set to at least a level of 10. As this configuration should be rare in production instances of bind, it is unlikely that most servers will be exploitable. The debug level of the bind server can be checked via the rndc status command, which will return the current trace level as "debug level". A value of 10 or above would most likely make this flaw exploitable.

CVSS v3 metrics

CVSS3 Base Score 5.9
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact None
Availability Impact High

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (bind) RHSA-2019:0194 2019-01-29

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 8 bind Not affected
Red Hat Enterprise Linux 6 bind Not affected
Red Hat Enterprise Linux 5 bind97 Not affected
Red Hat Enterprise Linux 5 bind Not affected


Ensure that debug logging is disabled and set to 0. This can be verified on the Bind server by the rndc status command.

External References

Last Modified

CVE description copyright © 2017, The MITRE Corporation