CVE-2019-9852 Information

Description

LibreOffice has a feature where documents can specify that pre-installed macros can be executed on various script events such as mouse-over document-open etc. Access is intended to be restricted to scripts under the share/Scripts/python user/Scripts/python sub-directories of the LibreOffice install. Protection was added to address CVE-2018-16858 to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed. However this new protection could be bypassed by a URL encoding attack. In the fixed versions the parsed url describing the script location is correctly encoded before further processing. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PMEGUWMWORC3DOVEHVXLFT3A5RSCMLBH/ https://seclists.org/bugtraq/2019/Aug/28 https://seclists.org/bugtraq/2019/Sep/17 https://usn.ubuntu.com/4102-1/ https://www.debian.org/security/2019/dsa-4501 https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9852 LibreOffice has a feature where documents can specify that pre-installed macros can be executed on various script events such as mouse-over document-open etc. Access is intended to be restricted to scripts under the share/Scripts/python user/Scripts/python sub-directories of the LibreOffice install. Protection was added to address CVE-2018-16858 to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed. However this new protection could be bypassed by a URL encoding attack. In the fixed versions the parsed url describing the script location is correctly encoded before further processing. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8