high
7.8
CWE
116
Advisory Published
Updated

CVE-2019-9853: Insufficient URL decoding flaw in categorizing macro location

First published: Fri Sep 27 2019(Updated: )

LibreOffice documents can contain macros. The execution of those macros is controlled by the document security settings, typically execution of macros are blocked by default. A URL decoding flaw existed in how the urls to the macros within the document were processed and categorized, resulting in the possibility to construct a document where macro execution bypassed the security settings. The documents were correctly detected as containing macros, and prompted the user to their existence within the documents, but macros within the document were subsequently not controlled by the security settings allowing arbitrary macro execution This issue affects: LibreOffice 6.2 series versions prior to 6.2.7; LibreOffice 6.3 series versions prior to 6.3.1.

Credit: security@documentfoundation.org

Affected SoftwareAffected VersionHow to fix
redhat/LibreOffice<6.2.6
6.2.6
redhat/LibreOffice<6.3.1
6.3.1
Libreoffice Libreoffice>=6.2.0<6.2.6
Libreoffice Libreoffice>=6.3.0<6.3.1

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-9853?

    CVE-2019-9853 is a vulnerability in LibreOffice that allows the execution of macros in documents, bypassing document security settings.

  • What is the severity of CVE-2019-9853?

    CVE-2019-9853 has a severity level of 7.8, which is considered high.

  • How does CVE-2019-9853 work?

    CVE-2019-9853 is caused by a URL decoding flaw in LibreOffice's processing and categorization of macros, allowing macros to execute despite security settings.

  • Which versions of LibreOffice are affected by CVE-2019-9853?

    Versions 6.2.0 to 6.2.6 and versions 6.3.0 to 6.3.1 of LibreOffice are affected by CVE-2019-9853.

  • How can I fix CVE-2019-9853?

    To fix CVE-2019-9853, update to LibreOffice version 6.2.6 or later, or version 6.3.1 or later.

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