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CVE-2019-9855

Windows 8.3 path equivalence handling flaw allows LibreLogo script execution

CRITICAL
9.8
CVSS Score
Published: September 6, 2019 at 06:40 PM UTC
Updated: June 17, 2026 at 02:44 AM UTC
3 products affected across 3 vendorsLeapLibreofficeLibreOffice· also runs on 1 platform

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

Description

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. LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc. Protection was added to block calling LibreLogo from script event handers. However a Windows 8.3 path equivalence handling flaw left LibreOffice vulnerable under Windows that a document could trigger executing LibreLogo via a Windows filename pseudonym. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libreoffice· Libreoffice
95%
6.2.0 ≤ v < 6.2.76.3.0 ≤ v < 6.3.1
Affected range stops below 6.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.1, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
Leap· openSUSEdrupal
95%
15.015.1
LibreOffice· Document
60%
6.2 ≤ v < 6.2.76.3 ≤ v < 6.3.16.26.3
Affected range stops below 6.2.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.1, so it looks safe — our inference, not a vendor statement

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (3)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-417

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