LibreOffice Releases Software Update to Patch 3 New Vulnerabilities

The team behind LibreOffice has released security updates to fix
three security flaws in the productivity software, one of which
could be exploited to achieve arbitrary code execution on affected
systems.

Tracked as CVE-2022-26305^[1], the issue has been
described as a case of improper certificate validation when
checking whether a macro is signed by a trusted author, leading to
the execution of rogue code packaged within the macros.

“An adversary could therefore create an arbitrary certificate
with a serial number and an issuer string identical to a trusted
certificate which LibreOffice would present as belonging to the
trusted author, potentially leading to the user to execute
arbitrary code contained in macros improperly trusted,” LibreOffice
said in an advisory.

Also resolved is the use of a static initialization vector
(IV) during encryption
(CVE-2022-26306^[2]) that could have
weakened the security should a bad actor have access to the user’s
configuration information.

Lastly, the updates also resolve CVE-2022-26307^[3], wherein the master key
was poorly encoded, rendering the stored passwords susceptible to a
brute-force attack if an adversary is in possession of the user
configuration.

The three vulnerabilities, which were reported by OpenSource
Security GmbH on behalf of the German Federal Office for
Information Security, have been addressed in LibreOffice versions
7.2.7, 7.3.2, and 7.3.3.

The patches come five months after the Document Foundation fixed
another improper certificate validation bug (CVE-2021-25636^[4]) in February 2022. Last
October, three spoofing flaws were patched that could be abused^[5]
to alter documents to make them appear as if they are digitally
signed by a trusted source.