CVE-2018-5743

Publication date 24 April 2019

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

By design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bind9	19.04 disco	Fixed 1:9.11.5.P1+dfsg-1ubuntu2.3
	18.10 cosmic	Fixed 1:9.11.4+dfsg-3ubuntu5.3
	18.04 LTS bionic	Fixed 1:9.11.3+dfsg-1ubuntu1.7
	16.04 LTS xenial	Fixed 1:9.10.3.dfsg.P4-8ubuntu1.14
	14.04 LTS trusty	Fixed 1:9.9.5.dfsg-3ubuntu0.19+esm1 Ubuntu Pro

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Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2018-5743

Cvss 3 Severity Score

Status

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Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references