LibreOffice: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3971
                  USN-5153-1: LibreOffice vulnerabilities
                             23 November 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           LibreOffice
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-25634 CVE-2021-25633 

Reference:         ESB-2021.3449

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5153-1

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USN-5153-1: LibreOffice vulnerabilities
22 November 2021

LibreOffice could incorrectly validate document signatures.
Releases

  o Ubuntu 20.04 LTS

Packages

  o libreoffice - Office productivity suite

Details

It was discovered that LibreOffice incorrectly handled digital signatures.
An attacker could possibly use this issue to create a specially crafted
document that would display a validly signed indicator, contrary to
expectations.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 20.04

  o libreoffice-core - 1:6.4.7-0ubuntu0.20.04.2

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-25634
  o CVE-2021-25633

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