Bug 1904221 (CVE-2020-17527)

Summary: CVE-2020-17527 tomcat: HTTP/2 request header mix-up
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aileenc, akoufoud, alazarot, alee, almorale, anstephe, ascheel, asoldano, atangrin, avibelli, bbaranow, bgeorges, bmaxwell, brian.stansberry, cdewolf, chazlett, cmoulliard, coolsvap, csutherl, darran.lofthouse, dbecker, dkreling, dosoudil, drieden, eleandro, etirelli, ggaughan, gmalinko, gzaronik, huwang, ibek, ikanello, ivan.afonichev, iweiss, janstey, java-sig-commits, jawilson, jclere, jjoyce, jochrist, jolee, jpallich, jperkins, jschatte, jschluet, jstastny, jwon, krathod, krzysztof.daniel, kverlaen, kwills, lgao, lhh, lpeer, lthon, mbabacek, mburns, mkolesni, mnovotny, msochure, msvehla, mszynkie, myarboro, nwallace, pgallagh, pjindal, pmackay, rguimara, rhcs-maint, rhel8-maint, rrajasek, rruss, rstancel, rsvoboda, rsynek, sclewis, scohen, sdaley, slinaber, smaestri, tom.jenkinson, vhalbert, weli
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
See Also: https://issues.redhat.com/browse/JWS-1894
Fixed In Version: tomcat 10.0.0-M10, tomcat 9.0.40, tomcat 8.5.60 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2021-02-11 16:09:56 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1904222, 1906969, 1910708    
Bug Blocks: 1904223    

Description Guilherme de Almeida Suckevicz 2020-12-03 20:38:31 UTC
While investigating Bug 64830 it was discovered that Apache Tomcat could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.


Comment 1 Guilherme de Almeida Suckevicz 2020-12-03 20:39:02 UTC
Created tomcat tracking bugs for this issue:

Affects: fedora-all [bug 1904222]

Comment 4 Ted Jongseok Won 2020-12-04 20:22:42 UTC
This vulnerability is out of security support scope for the following products:
 * Red Hat Enterprise Application Platform 6
 * Red Hat Data Grid 6
 * Red Hat JBoss Data Virtualization 6
 * Red Hat JBoss Fuse 6

Please refer to https://access.redhat.com/support/policy/updates/jboss_notes for more details.

Comment 14 Todd Cullum 2020-12-18 21:41:54 UTC

Red Hat Enterprise Linux 8's Identity Management and Certificate System are using a vulnerable version of Tomcat that is bundled into the pki-servlet-engine component. However, HTTP/2 is not enabled in such a configuration, and it is not possible to trigger the flaw in a supported setup. A future update may fix the code.

Red Hat Enterprise Linux 7's tomcat package, Identity Management, and Certificate System are all not affected by this flaw because HTTP/2 is not supported in the shipped version of tomcat in those packages.

tomcat5 and tomcat6 in Red Hat Enterprise Linux 5 and 6 (respectively) are not affected by this flaw because HTTP/2 is not supported in the shipped versions of those packages.

Comment 16 errata-xmlrpc 2021-02-11 13:50:29 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 5.4 on RHEL 7
  Red Hat JBoss Web Server 5.4 on RHEL 8

Via RHSA-2021:0494 https://access.redhat.com/errata/RHSA-2021:0494

Comment 17 errata-xmlrpc 2021-02-11 13:51:52 UTC
This issue has been addressed in the following products:

  Red Hat JBoss Web Server

Via RHSA-2021:0495 https://access.redhat.com/errata/RHSA-2021:0495

Comment 18 Product Security DevOps Team 2021-02-11 16:09:56 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


Comment 21 errata-xmlrpc 2021-10-28 07:52:27 UTC
This issue has been addressed in the following products:

  Red Hat Support for Spring Boot 2.4.9

Via RHSA-2021:4012 https://access.redhat.com/errata/RHSA-2021:4012

Comment 22 errata-xmlrpc 2021-12-14 21:33:14 UTC
This issue has been addressed in the following products:

  Red Hat Fuse 7.10

Via RHSA-2021:5134 https://access.redhat.com/errata/RHSA-2021:5134