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Ubuntu Security Notice USN-5694-1
October 20, 2022

libreoffice vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in LibreOffice.

Software Description:
- libreoffice: Office productivity suite

Details:

It was discovered that LibreOffice incorrectly handled links using the
Office URI Schemes. If a user were tricked into opening a specially
crafted document, a remote attacker could use this issue to execute
arbitrary scripts. (CVE-2022-3140)

Thomas Florian discovered that LibreOffice incorrectly handled crashes when
an encrypted document is open. If the document is recovered upon restarting
LibreOffice, subsequent saves of the document were unencrypted. This issue
only affected Ubuntu 18.04 LTS. (CVE-2020-12801)

Jens Müller discovered that LibreOffice incorrectly handled certain
documents containing forms. If a user were tricked into opening a specially
crafted document, a remote attacker could overwrite arbitrary files when
the form was submitted. This issue only affected Ubuntu 18.04 LTS.
(CVE-2020-12803)

It was discovered that LibreOffice incorrectly validated macro signatures.
If a user were tricked into opening a specially crafted document, a remote
attacker could possibly use this issue to execute arbitrary macros. This
issue only affected Ubuntu 18.04 LTS. (CVE-2022-26305)

It was discovered that Libreoffice incorrectly handled encrypting the
master key provided by the user for storing passwords for web connections.
A local attacker could possibly use this issue to obtain access to
passwords stored in the user’s configuration data. This issue only affected
Ubuntu 18.04 LTS. (CVE-2022-26306, CVE-2022-26307)

Update instructions:

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

Ubuntu 22.04 LTS:
   libreoffice                     1:7.3.6-0ubuntu0.22.04.2

Ubuntu 20.04 LTS:
   libreoffice                     1:6.4.7-0ubuntu0.20.04.6

Ubuntu 18.04 LTS:
   libreoffice                     1:6.0.7-0ubuntu0.18.04.12

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

References:
   https://ubuntu.com/security/notices/USN-5694-1
   CVE-2020-12801, CVE-2020-12803, CVE-2022-26305, CVE-2022-26306,
   CVE-2022-26307, CVE-2022-3140

Package Information:
   https://launchpad.net/ubuntu/+source/libreoffice/1:7.3.6-0ubuntu0.22.04.2
   https://launchpad.net/ubuntu/+source/libreoffice/1:6.4.7-0ubuntu0.20.04.6
   https://launchpad.net/ubuntu/+source/libreoffice/1:6.0.7-0ubuntu0.18.04.12