Bug 1758975 (CVE-2019-16910)

Summary:	CVE-2019-16910 mbedtls: use of RNG with insufficient entropy allows to recover private key vise side-channel attack
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ms, redhat-bugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	mbedtls 2.19.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-10-07 06:51:05 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:	1758976, 1758977
Bug Blocks:

Description Dhananjay Arunesh 2019-10-07 05:51:33 UTC

Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)

Reference:
https://github.com/ARMmbed/mbedtls/commit/298a43a77ec0ed2c19a8c924ddd8571ef3e65dfd
https://github.com/ARMmbed/mbedtls/commit/33f66ba6fd234114aa37f0209dac031bb2870a9b
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PEHHH2DOBXB25CAU3Q6E66X723VAYTB5/
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-10

Comment 1 Dhananjay Arunesh 2019-10-07 05:52:06 UTC

Created mbedtls tracking bugs for this issue:

Affects: epel-all [bug 1758977]
Affects: fedora-all [bug 1758976]

Comment 2 Product Security DevOps Team 2019-10-07 06:51:05 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.