Bug 2013152 (CVE-2021-25635) - CVE-2021-25635 libreoffice: Content Manipulation with Certificate Validation Attack
Summary: CVE-2021-25635 libreoffice: Content Manipulation with Certificate Validation ...
Status: NEW
Alias: CVE-2021-25635
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 2014209 2014210
Blocks: 2013154
TreeView+ depends on / blocked
Reported: 2021-10-12 08:58 UTC by Sandipan Roy
Modified: 2021-10-18 12:36 UTC (History)
4 users (show)

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.
Clone Of:
Last Closed:

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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.

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