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CVE-2018-11763

Published: 25 September 2018

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.

Notes

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

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
bionic
Released (2.4.29-1ubuntu4.4)
trusty Not vulnerable
(code not present)
upstream
Released (2.4.35)
xenial Not vulnerable
(code not built)
Patches:
upstream: https://svn.apache.org/viewvc?view=revision&revision=1840757
upstream: https://github.com/apache/httpd/commit/484aba5048e3457dc1d15189f1910d007b1a4a76

Severity score breakdown

Parameter Value
Base score 5.9
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