CVE-2019-9854
CVE-2019-9854 — Unsafe URL assembly flaw in allowed script location check
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…
Published Updated Sources: cvelistV5, Document Fdn.
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.
Exploitation
Unreported
no source claims exploitation
EPSS
2%
chance of exploitation in 30 days
CVSS base
Unscored
no source published a base score
Affected scope
The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.
Vendors (1)
Products (1)
Detection
Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.
- Search application, proxy, and WAF logs for requests touching /Scripts/python.
References
8 on the record
- www.libreoffice.org/about-us/security/advisories/CVE-2019-9854/
x_refsource_CONFIRM
- www.debian.org/security/2019/dsa-4519
vendor-advisory, x_refsource_DEBIAN
- seclists.org/bugtraq/2019/Sep/17
mailing-list, x_refsource_BUGTRAQ
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQKKOIY2DMZCXJINOLIQXD2NWISDKK3N/
vendor-advisory, x_refsource_FEDORA
- usn.ubuntu.com/4138-1/
vendor-advisory, x_refsource_UBUNTU
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
vendor-advisory, x_refsource_SUSE
- lists.debian.org/debian-lts-announce/2019/10/msg00005.html
mailing-list, x_refsource_MLIST
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html
vendor-advisory, x_refsource_SUSE
Elsewhere on this site
- document foundationevery CVE for this vendor
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.