Bug 1362183 (CVE-2016-5419)

Summary:	CVE-2016-5419 curl: TLS session resumption client cert bypass
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alonbl, apmukher, bmcclain, bodavis, cfergeau, csutherl, dbhole, dblechte, eedri, hhorak, jclere, jorton, kanderso, kdreyer, kdudka, lgao, lsurette, luhliari, mbabacek, mgoldboi, michal.skrivanek, myarboro, omajid, rwagner, sardella, security-response-team, slawomir, srevivo, twalsh, weli, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	curl 7.50.1	Doc Type:	Bug Fix
Doc Text:	It was found that the libcurl library did not prevent TLS session resumption when the client certificate had changed. An attacker could potentially use this flaw to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:57:05 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:	1363642, 1363643, 1363644, 1364910, 1367871
Bug Blocks:	1362200, 1395463

Description Adam Mariš 2016-08-01 13:18:54 UTC

It was reported that libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate).

libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection couldn't be kept alive to make the next handshake faster.

External Reference:

https://curl.haxx.se/docs/adv_20160803A.html

Comment 1 Adam Mariš 2016-08-03 09:24:35 UTC

Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1363642]

Comment 2 Adam Mariš 2016-08-03 09:24:46 UTC

Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1363643]
Affects: epel-7 [bug 1363644]

Comment 3 Fedora Update System 2016-08-05 20:52:38 UTC

curl-7.47.1-6.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-08-16 22:21:16 UTC

curl-7.43.0-8.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 9 errata-xmlrpc 2016-11-03 17:44:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2575 https://rhn.redhat.com/errata/RHSA-2016-2575.html

Comment 11 errata-xmlrpc 2016-12-15 22:11:44 UTC

This issue has been addressed in the following products:



Via RHSA-2016:2957 https://rhn.redhat.com/errata/RHSA-2016-2957.html

Comment 12 errata-xmlrpc 2018-11-13 08:31:59 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