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tl:dr upgrade to LibreOffice 7-0 to 7.0.6, libreoffice 7-1 to 7.1.2
(or libreoffice 7.2.0)

LibreOffice supports digital signatures of ODF documents and macros
within documents, presenting visual aids that no alteration of the
document occurred since the last signing and that the signature is
valid.

The Network and Data Security group at Ruhr University Bochum
reported a number of flaws with the implementation of this.

CVE-2021-25633
Content Manipulation with Double Certificate Attack
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25633
Fixed in 7.0.6 and 7.1.2

CVE-2021-25634
Timestamp Manipulation with Signature Wrapping
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25634
Fixed in 7.0.6 and 7.1.2

CVE-2021-25635
Content Manipulation with Certificate Validation Attack
https://www.libreoffice.org/about-us/security/advisories/CVE-2021-25635
Fixed in 7.0.5 and 7.1.1


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