Bug 1523510 (CVE-2017-3738)

Summary:	CVE-2017-3738 openssl: rsaz_1024_mul_avx2 overflow bug on x86_64
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	apmukher, bmaxwell, bmcclain, cdewolf, cfergeau, chazlett, csutherl, darran.lofthouse, dblechte, dimitris, dosoudil, eedri, erik-fedora, extras-orphan, fgavrilo, gzaronik, jawilson, jclere, jondruse, jorton, jshepherd, kbost, ktietz, lersek, lgao, lsurette, marcandre.lureau, mbabacek, mgoldboi, michal.skrivanek, mturk, myarboro, pgier, pjurak, ppalaga, psakar, pslavice, ravpatil, rh-spice-bugs, rjones, rnetuka, rstancel, rsvoboda, sherold, slawomir, srevivo, tmraz, twalsh, vtunka, weli, xingli, ykaul, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	openssl 1.0.2n	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:32:57 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:	1523511, 1523512, 1523513, 1525029, 1525347, 1527306, 1527307
Bug Blocks:	1523515

Description Andrej Nemec 2017-12-08 07:40:54 UTC

There is an overflow bug in the AVX2 Montgomery multiplication procedure
used in exponentiation with 1024-bit moduli. No EC algorithms are affected.
Analysis suggests that attacks against RSA and DSA as a result of this defect
would be very difficult to perform and are not believed likely. Attacks
against DH1024 are considered just feasible, because most of the work
necessary to deduce information about a private key may be performed offline.
The amount of resources required for such an attack would be significant.
However, for an attack on TLS to be meaningful, the server would have to share
the DH1024 private key among multiple clients, which is no longer an option
since CVE-2016-0701.

This only affects processors that support the AVX2 but not ADX extensions
like Intel Haswell (4th generation).

Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732
and CVE-2015-3193.

External References:

https://www.openssl.org/news/secadv/20171207.txt

Comment 1 Andrej Nemec 2017-12-08 07:42:15 UTC

Created mingw-openssl tracking bugs for this issue:

Affects: epel-7 [bug 1523513]
Affects: fedora-all [bug 1523511]


Created openssl tracking bugs for this issue:

Affects: fedora-all [bug 1523512]

Comment 2 Huzaifa S. Sidhpurwala 2017-12-11 05:18:40 UTC

Upstream commit:

https://github.com/openssl/openssl/commit/5630661aecbea5fe3c4740f5fea744a1f07a6253

Comment 8 Ravindra Patil 2018-01-15 20:49:11 UTC

Any ETA for release of fix for openssl ?

Comment 11 errata-xmlrpc 2018-04-10 08:40:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0998 https://access.redhat.com/errata/RHSA-2018:0998

Comment 12 errata-xmlrpc 2018-07-12 16:06:00 UTC

This issue has been addressed in the following products:

  Red Hat JBoss Core Services

Via RHSA-2018:2187 https://access.redhat.com/errata/RHSA-2018:2187

Comment 13 errata-xmlrpc 2018-07-12 16:16:08 UTC

This issue has been addressed in the following products:

  JBoss Core Services on RHEL 6

Via RHSA-2018:2186 https://access.redhat.com/errata/RHSA-2018:2186

Comment 14 errata-xmlrpc 2018-07-12 16:18:15 UTC

This issue has been addressed in the following products:

  JBoss Core Services on RHEL 7

Via RHSA-2018:2185 https://access.redhat.com/errata/RHSA-2018:2185

Comment 16 Joshua Padman 2019-05-15 22:43:02 UTC

This vulnerability is out of security support scope for the following product:
 * Red Hat Enterprise Application Platform 5

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