Bug 1723708 (CVE-2019-10072)

Summary:	CVE-2019-10072 tomcat: HTTP/2 connection window exhaustion on write, incomplete fix of CVE-2019-0199
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aileenc, akoufoud, alazarot, alee, almorale, anstephe, chazlett, coolsvap, csutherl, drieden, etirelli, gzaronik, ibek, ivan.afonichev, janstey, java-sig-commits, jclere, jochrist, krathod, krzysztof.daniel, kverlaen, lgao, mbabacek, mnovotny, myarboro, paradhya, pjindal, rhcs-maint, rrajasek, rsynek, sdaley, twalsh, weli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Apache Tomcat 9.0.20, Apache Tomcat 8.5.41	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-20 18:51:30 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:	1723711, 1723712
Bug Blocks:	1723709

Description Dhananjay Arunesh 2019-06-25 08:23:52 UTC

The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write. By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

References:

http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.20
http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.41
http://mail-archives.us.apache.org/mod_mbox/www-announce/201906.mbox/%3Cca69531a-1592-be7b-60ce-729549c7f812%40apache.org%3E

Upstream commits:

Tomcat 9.0:
https://github.com/apache/tomcat/commit/7f748eb
https://github.com/apache/tomcat/commit/ada725a

Tomcat 8.5
https://github.com/apache/tomcat/commit/0bcd69c
https://github.com/apache/tomcat/commit/8d14c6f

Comment 1 Dhananjay Arunesh 2019-06-25 08:26:54 UTC

Created tomcat tracking bugs for this issue:

Affects: epel-all [bug 1723711]

Comment 2 Dhananjay Arunesh 2019-06-25 08:27:16 UTC

Created tomcat tracking bugs for this issue:

Affects: fedora-all [bug 1723712]

Comment 3 Tomas Hoger 2019-06-25 10:24:22 UTC

External References:

http://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.20
http://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.41

Comment 6 Doran Moppert 2019-06-27 04:10:11 UTC

Mitigation:

pki-servlet-container does not use HTTP/2 in its default configuration.

Comment 8 errata-xmlrpc 2019-11-20 16:04:37 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server

Via RHSA-2019:3931 https://access.redhat.com/errata/RHSA-2019:3931

Comment 9 errata-xmlrpc 2019-11-20 16:07:14 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Web Server 5.2 on RHEL 7
  Red Hat JBoss Web Server 5.2 on RHEL 6
  Red Hat JBoss Web Server 5.2 on RHEL 8

Via RHSA-2019:3929 https://access.redhat.com/errata/RHSA-2019:3929

Comment 10 Product Security DevOps Team 2019-11-20 18:51:30 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-10072