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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

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

Content Manipulation with Double Certificate Attack
Fixed in 7.0.6 and 7.1.2

Timestamp Manipulation with Signature Wrapping
Fixed in 7.0.6 and 7.1.2

Content Manipulation with Certificate Validation Attack
Fixed in 7.0.5 and 7.1.1

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