Bug 1416855 (CVE-2017-3730)

Summary:	CVE-2017-3730 openssl: Bad (EC)DHE parameters cause a client crash
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bbaranow, bmaxwell, bmcclain, cdewolf, cfergeau, csutherl, dandread, darran.lofthouse, dblechte, dosoudil, eedri, erik-fedora, fnasser, gklein, gzaronik, huwang, jawilson, jclere, ktietz, lersek, lgao, lsurette, marcandre.lureau, mbabacek, mgoldboi, michal.skrivanek, mturk, myarboro, pgier, psakar, pslavice, rbalakri, redhat-bugzilla, rh-spice-bugs, rjones, rnetuka, rsvoboda, sardella, sherold, srevivo, tmraz, twalsh, vtunka, weli, ykaul, ylavi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	openssl 1.1.0d	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-31 11:58:43 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:
Bug Blocks:	1416858

Description Andrej Nemec 2017-01-26 15:39:44 UTC

If a malicious server supplies bad parameters for a DHE or ECDHE key exchange
then this can result in the client attempting to dereference a NULL pointer
leading to a client crash. This could be exploited in a Denial of Service
attack.

This issue does not affect OpenSSL version 1.0.2.

External References:

https://www.openssl.org/news/secadv/20170126.txt

Comment 1 Tomas Hoger 2017-01-26 16:08:37 UTC

Upstream commit:

https://git.openssl.org/?p=openssl.git;a=commitdiff;h=efbe126e3ebb9123ac9d058aa2bb044261342aaa

Write up from the original reporter:

https://guidovranken.wordpress.com/2017/01/26/cve-2017-3730-openssl-1-1-0-remote-client-denial-of-service-affects-servers-as-well-poc/

Comment 2 Tomas Hoger 2017-01-31 11:58:43 UTC

This only affected OpenSSL 1.1.0, which is not currently included in any Red Hat product.