CVE-2019-9855

Windows 8.3 path equivalence handling flaw allows LibreLogo script execution

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

LibreOffice es comúnmente paquetizado con LibreLogo, un script de gráficos vectoriales turtle programable, que puede ejecutar comandos de python arbitrarios contenidos con el documento desde que es activado. LibreOffice también presenta una funcionalidad en la que los documentos pueden especificar que los scripts preinstalados pueden ser ejecutados en varios eventos de script de documentos, tales como mouse-over, etc. La protección fue agregada para bloquear la llamada a LibreLogo desde los manejadores de eventos de script. Sin embargo, un fallo en el manejo de la equivalencia de ruta de Windows versión 8.3 dejó a LibreOffice vulnerable bajo Windows que un documento podría desencadenar la ejecución de LibreLogo por medio del seudónimo del nombre de archivo de Windows. Este problema afecta a: Document Foundation LibreOffice versiones 6.2 anteriores a 6.2.7; versiones 6.3 anteriores a 6.3.1.

*Credits: Thanks to alex (@insertscript) for reporting this issue

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-03-17 CVE Reserved
2019-09-06 CVE Published
2024-08-30 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-417: Communication Channel Errors

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html	2022-10-14
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00055.html	2022-10-14
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855	2022-10-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libreoffice Search vendor "Libreoffice"	Libreoffice Search vendor "Libreoffice" for product "Libreoffice"	>= 6.2.0 < 6.2.7 Search vendor "Libreoffice" for product "Libreoffice" and version " >= 6.2.0 < 6.2.7"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Libreoffice Search vendor "Libreoffice"	Libreoffice Search vendor "Libreoffice" for product "Libreoffice"	>= 6.3.0 < 6.3.1 Search vendor "Libreoffice" for product "Libreoffice" and version " >= 6.3.0 < 6.3.1"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.0 Search vendor "Opensuse" for product "Leap" and version "15.0"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected