CVE-2018-5740
bind: processing of certain records when "deny-answer-aliases" is in use may trigger an assert leading to a denial of service
Severity
ImportantRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · August 9, 2018
Updated · June 30, 2026
Description
A denial of service flaw was discovered in bind versions that include the "deny-answer-aliases" feature. This flaw may allow a remote attacker to trigger an INSIST assert in named leading to termination of the process and a denial of service condition.
Statement
The "deny-answer-aliases" configuration option is not enabled in default configurations of bind. Upstream states that this option is very rarely used. As such, if customers have not specifically enabled this option in configurations, the risk should be mitigated.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Disabling the "deny-answer-aliases" configuration option should prevent exploitation.
CVSS / CWE
CVSS 3.0 · 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-617 · Reachable Assertion