Bug 1633399 (CVE-2018-11763)

Summary:	CVE-2018-11763 httpd: DoS for HTTP/2 connections by continuous SETTINGS frames
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, anon.amish, aogburn, bmaxwell, bmcclain, cbyrne, cdewolf, chazlett, cmacedo, csutherl, darran.lofthouse, dbaker, dblechte, dfediuck, dffrench, dimitris, dosoudil, drusso, eedri, fgavrilo, gzaronik, hhorak, jawilson, jclere, jdoyle, jkaluza, jmadigan, jokerman, jorton, jshepherd, lgao, lgriffin, luhliari, mbabacek, mgoldboi, michal.skrivanek, mturk, myarboro, nbhumkar, ngough, pahan, pgier, pjurak, ppalaga, psakar, pslavice, pwright, ravpatil, rmullett, rnetuka, rstancel, rsvoboda, sbonazzo, schandle, sherold, sthangav, trankin, trepel, twalsh, vtunka, weli, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	httpd 2.4.35, mod_http2 1.11.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:38:52 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1633400, 1633401, 1635838
Bug Blocks:	1633402

Description Pedro Sampaio 2018-09-26 21:37:20 UTC

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.

References:

https://httpd.apache.org/security/vulnerabilities_24.html

Comment 1 Pedro Sampaio 2018-09-26 21:38:18 UTC

Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1633400]

Comment 3 Tomas Hoger 2018-09-27 09:18:40 UTC

The httpd packages in Red Hat Enterprise Linux 7 and earlier do not include support for HTTP/2 and hence are not affected by this issue.

Comment 5 Joe Orton 2018-09-27 10:32:48 UTC

This issue is fixed upstream in httpd in the following commits:

trunk: https://svn.apache.org/r1840010
2.4.x: https://svn.apache.org/r1840757

Which matches the change made downstream in mod_h2 on github:

https://github.com/icing/mod_h2/commit/5e75e5685dd043fe93a5a08a15edd087a43f6968

i.e. this issue is fixed in httpd 2.4.35 and later, and in mod_http2 1.11.0 and later.

Comment 11 errata-xmlrpc 2018-11-13 08:36:51 UTC

This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2018:3558

Comment 18 errata-xmlrpc 2019-02-18 16:55:52 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Core Services

Via RHSA-2019:0366 https://access.redhat.com/errata/RHSA-2019:0366

Comment 19 errata-xmlrpc 2019-02-18 16:58:33 UTC

This issue has been addressed in the following products:

  JBoss Core Services on RHEL 6
  JBoss Core Services on RHEL 7

Via RHSA-2019:0367 https://access.redhat.com/errata/RHSA-2019:0367