Bug 2013152 (CVE-2021-25635)

Summary:	CVE-2021-25635 libreoffice: Content Manipulation with Certificate Validation Attack
Product:	[Other] Security Response	Reporter:	Sandipan Roy <saroy>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	caolanm, dtardon, erack, sbergman
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	LibreOffice 7.0.5, LibreOffice 7.1.1	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in LibreOffice, where it improperly validated signatures for algorithms that were not verified. This flaw leads to LibreOffice presenting a valid signature when the validity of the signature was not verified. The highest threat from this vulnerability is to confidentiality and integrity.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-11 21:46:18 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:	2014209, 2014210
Bug Blocks:	2013154

Description Sandipan Roy 2021-10-12 08:58:46 UTC

An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with a signature untrusted by the target, then modify it to change the signature algorithm to an invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a valid signature issued by a trusted person.

Comment 2 Garrett Tucker 2021-10-14 15:49:13 UTC

RHEL 8.6.0 and below are all affected by this flaw. RHEL 9 uses an updated version which is not exposed to the flaw. LibreOffice improperly validated signatures that it could not verify the algorithm for. This led to LibreOffice presenting a valid signature, even though the signature could not be verified as valid.

Comment 4 errata-xmlrpc 2022-05-10 13:20:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1766 https://access.redhat.com/errata/RHSA-2022:1766

Comment 5 Product Security DevOps Team 2022-05-11 21:46:17 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-2021-25635