Improper input validation in Document Foundation Libreoffice
CVE-2019-9851
LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from. Protection was added, to address CVE-2019-9848, to block calling LibreLogo from document event script handers, e.g. mouse over. However LibreOffice also has a separate feature where documents can specify that pre-installed scripts can be executed on various global script events such as document-open, etc. In the fixed versions, global script event handlers are validated equivalently to document script event handlers. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.778 (99.6th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.783 · newest: 0.778 · change: -0.005
Affected products
- Document Foundation Libreoffice — versions unspecified
- Libreoffice
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 8.0, 9.0, 10.0
- Fedoraproject Fedora — versions 29
- openSUSE Leap — versions 15.0, 15.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.libreoffice.org/about-us/security/advisories/CVE-2019-9851 (Vendor Advisory)
- seclists.org/bugtraq/2019/Aug/28 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2019/dsa-4501 (vendor-advisory, Third Party Advisory)
- packetstormsecurity.com/files/154168/LibreOffice-Macro-Python-Code-Execution.ht… (VDB Entry, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- usn.ubuntu.com/4102-1/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/10/msg00005.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-9851?
- CVE-2019-9851 is a critical-severity vulnerability in Document Foundation Libreoffice, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2019-08-15.
- How severe is CVE-2019-9851?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2019-9851 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.