Bug 1770900 (CVE-2019-14855)

Summary:	CVE-2019-14855 gnupg2: OpenPGP Key Certification Forgeries with SHA-1
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bcl, crypto-team, extras-orphan, rdieter, security-response-team, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gnupg2 2.2.18	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in OpenPGP Key Certification Forgeries in the way certificate signatures could be forged by using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-20 10:31:46 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:	1815379, 1815380
Bug Blocks:	1759069

Description Marian Rehak 2019-11-11 13:18:28 UTC

OpenPGP Key Certification Forgeries with SHA-1. Older versions of OpenPGP implementations will default to using SHA-1 which is not secure.

Comment 1 Huzaifa S. Sidhpurwala 2020-03-20 05:12:43 UTC

Acknowledgments:

Name: Werner Koch (GnuPG project)

Comment 2 Huzaifa S. Sidhpurwala 2020-03-20 05:12:47 UTC

Statement:

This flaw only affects the versions of GnuPG package which defaults to signing with SHA-1. GnuPG 2.0 and above does not use SHA-1 by default therefore are not directly affected by this flaw.

Comment 3 Huzaifa S. Sidhpurwala 2020-03-20 05:12:52 UTC

External References:

https://rwc.iacr.org/2020/slides/Leurent.pdf

Comment 4 Huzaifa S. Sidhpurwala 2020-03-20 05:24:01 UTC

Created gnupg1 tracking bugs for this issue:

Affects: fedora-30 [bug 1815379]
Affects: fedora-31 [bug 1815380]

Comment 5 Product Security DevOps Team 2020-03-20 10:31:46 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-14855