Bug 1202338 (CVE-2015-0291)

Summary:	CVE-2015-0291 openssl: ClientHello sigalgs NULL pointer dereference DoS
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aavati, acathrow, alonbl, bazulay, bmcclain, cdewolf, cfergeau, dandread, darran.lofthouse, dblechte, dknox, ecohen, erik-fedora, gklein, idith, iheim, jason.greene, jawilson, jboss-set, jclere, jdoyle, ktietz, lfarkas, lgao, lsurette, marcandre.lureau, mehmetgelisin, michal.skrivanek, myarboro, nlevinki, pgier, pslavice, rbalakri, rfortier, rhs-bugs, rh-spice-bugs, rjones, rsvoboda, security-response-team, sgirijan, smohan, ssaha, tmraz, twalsh, vbellur, vtunka, weli, yeylon
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	openssl 1.0.2a	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-17 08:09:42 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:	1202442

Description Martin Prpič 2015-03-16 12:44:52 UTC

A NULL pointer dereference flaw was found in the way OpenSSL handled renegotiation requests with an invalid Signature Algorithms extension. A remote attacker could use this flaw to cause an OpenSSL server to crash.

This issue affects OpenSSL version 1.0.2, and was fixed in version 1.0.2a.

Acknowledgements:

Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges David Ramos of Stanford University as the original reporter.

Comment 1 Tomas Hoger 2015-03-17 08:06:36 UTC

Affected code was introduced upstream in version 1.0.2 via this commit:

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=c70a1fee

It does not existing in openssl packages in Red Hat Enterprise Linux 7 and earlier.

Statement:

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 5, 6, and 7.

Comment 2 Martin Prpič 2015-03-19 14:35:03 UTC

External References:

https://openssl.org/news/secadv_20150319.txt
https://access.redhat.com/articles/1384453

Comment 3 Tomas Hoger 2015-03-19 15:33:00 UTC

Upstream commit:

https://git.openssl.org/?p=openssl.git;a=commitdiff;h=76343947ada960b6269090638f5391068daee88d