Insufficient URL encoding flaw in allowed script location check
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2019-9852
Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Thanks to Nils Emmerich of ERNW Research GmbH for discovering and reporting this issue
References
- https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9852
- https://seclists.org/bugtraq/2019/Aug/28
- https://www.debian.org/security/2019/dsa-4501
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PMEGUWMWORC3DOVEHVXLFT3A5RSCMLBH/
- https://usn.ubuntu.com/4102-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html
- https://seclists.org/bugtraq/2019/Sep/17
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
- https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html
More from Document Foundation
View All →Affected Vendor
Document Foundation
View all reports →