Bug 1595602 (CVE-2018-1000520)

Summary:	CVE-2018-1000520 mbedtls: Allows incorrectly signed certificate
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:	mstevens, redhat-bugzilla
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-04-09 11:48:24 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:	1595603, 1595604
Bug Blocks:

Description Andrej Nemec 2018-06-27 08:16:01 UTC

When the negotiated ciphersuite is of the type TLS-ECDH-RSA-* (ECDH key exchange + RSA signed certificate), ECDSA signed certificates are accepted, which means that the ciphersuite technically becomes TLS-ECDH-ECDSA.

Upstream issue:

https://github.com/ARMmbed/mbedtls/issues/1561

Comment 1 Andrej Nemec 2018-06-27 08:16:27 UTC

Created mbedtls tracking bugs for this issue:

Affects: epel-all [bug 1595604]
Affects: fedora-all [bug 1595603]

Comment 2 Morten Stevens 2019-03-28 13:56:42 UTC

@Andrej

I think we should close this. See: https://github.com/ARMmbed/mbedtls/issues/1561#issuecomment-424756997

Comment 3 Andrej Nemec 2019-04-09 11:48:24 UTC

(In reply to Morten Stevens from comment #2)
> @Andrej
> 
> I think we should close this. See:
> https://github.com/ARMmbed/mbedtls/issues/1561#issuecomment-424756997

I agree with the upstream analysis, it seems this was classified as a regular bug.