Bug 1875047 (CVE-2020-16150)

Summary:	CVE-2020-16150 mbedtls: local side channel attack on classical CBC decryption in (D)TLS
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ms, redhat-bugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2020-09-03 01:17:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1875048, 1875049
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2020-09-02 20:35:28 UTC

A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an attacker to recover secret key information. This affects CBC mode because of a computed time difference based on a padding length.

References:
https://tls.mbed.org/tech-updates/security-advisories
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1

Comment 1 Guilherme de Almeida Suckevicz 2020-09-02 20:35:46 UTC

Created mbedtls tracking bugs for this issue:

Affects: epel-all [bug 1875048]
Affects: fedora-all [bug 1875049]

Comment 2 Product Security DevOps Team 2020-09-03 01:17:44 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.