Bug 2013135 (CVE-2021-25633) - CVE-2021-25633 libreoffice: Content Manipulation with Double Certificate Attack
Summary: CVE-2021-25633 libreoffice: Content Manipulation with Double Certificate Attack
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-25633
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2013858 2013859
Blocks: 2013154
TreeView+ depends on / blocked
 
Reported: 2021-10-12 08:21 UTC by Sandipan Roy
Modified: 2022-05-11 21:16 UTC (History)
4 users (show)

Fixed In Version: LibreOffice 7.0.6, LibreOffice 7.1.2
Doc Type: If docs needed, set a value
Doc Text:
LibreOffice improperly validated signatures which by manipulation of signatures xml files allowed for multiple certificate data to be combined and led to the ability to show content as validly signed even if it was not content related to the signature
Clone Of:
Environment:
Last Closed: 2022-05-11 21:16:08 UTC


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:1766 0 None None None 2022-05-10 13:19:57 UTC

Description Sandipan Roy 2021-10-12 08:21:41 UTC
An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown.

External Reference:
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633

Comment 4 Garrett Tucker 2021-10-13 22:29:13 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 which by manipulation of signatures xml files allowed for multiple certificate data to be combined which led to LibreOffice believing that the signature was valid, when the content was not at all valid for the signature.

Comment 5 errata-xmlrpc 2022-05-10 13:19:54 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 6 Product Security DevOps Team 2022-05-11 21:16:07 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-2021-25633


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