CVE-2018-11763

Publication date 25 September 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	18.04 LTS bionic	Fixed 2.4.29-1ubuntu4.4
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

artful and older don't enable http2 in the build. see CVE-2018-1302 for a whole http2 backport requirement

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: https://svn.apache.org/viewvc?view=revision&revision=1840757 Upstream: 484aba5

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3783-1
Apache HTTP Server vulnerabilities
3 October 2018