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-2019-9852, to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed by employing a URL encoding attack to defeat the path verification step. However this protection could be bypassed by taking advantage of a flaw in how LibreOffice assembled the final script URL location directly from components of the passed in path as opposed to solely from the sanitized output of the path verification step. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libreoffice | Libreoffice | >= 6.2.0, < 6.2.7 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 8.0 |
| Fedoraproject | Fedora | 29 |
| Opensuse | Leap | 15.0 |
| Redhat | Enterprise Linux | 7.0 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00005.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://seclists.org/bugtraq/2019/Sep/17Mailing ListThird Party Advisory
- https://usn.ubuntu.com/4138-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4519Third Party Advisory
- https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9854/Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1769907Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00005.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://seclists.org/bugtraq/2019/Sep/17Mailing ListThird Party Advisory
- https://usn.ubuntu.com/4138-1/Third Party Advisory
FAQ
What is CVE-2019-9854?
CVE-2019-9854 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 s...
How severe is CVE-2019-9854?
CVE-2019-9854 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9854?
Check the references section above for vendor advisories and patch information. Affected products include: Libreoffice Libreoffice, Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap.