CVE-2019-9850

Insufficient url validation allowing 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 address CVE-2019-9848, to block calling LibreLogo from script event handers. However an insufficient url validation vulnerability in LibreOffice allowed malicious to bypass that protection and again trigger calling LibreLogo from script event handlers. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.

LibreOffice está comúnmente incorporada con LibreLogo, un script de gráficos vectoriales turtle programables, lo que puede ejecutar comandos arbitrarios de python contenidos con el documento desde que se inicia. LibreOffice también presenta una funcionalidad en la que los documentos pueden especificar que los scripts preinstalados pueden ser ejecutados en varios eventos de scripts de documentos, como mouse-over, etc. Se agregó protección, para abordar el CVE-2019-9848, para bloquear las llamadas a LibreLogo desde los controladores de eventos de scripts . Sin embargo, una vulnerabilidad de validación de URL insuficiente en LibreOffice permitió a malintencionados omitir esa protección y volver a activar la llamada a LibreLogo desde los manejadores de eventos de script. Este problema afecta: Document Foundation LibreOffice versiones anteriores a 6.2.6.

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

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

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
2019-08-15 CVE Published
2024-08-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-94: Improper Control of Generation of Code ('Code Injection')

CAPEC

References (11)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html	Mailing List
https://seclists.org/bugtraq/2019/Aug/28	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00006.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00067.html	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PMEGUWMWORC3DOVEHVXLFT3A5RSCMLBH	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WVSDPZJG3UA43X3JXRHJAWXLDZEW77LM	2023-11-07
https://usn.ubuntu.com/4102-1	2023-11-07
https://www.debian.org/security/2019/dsa-4501	2023-11-07
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9850	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-9850	2020-04-28
https://bugzilla.redhat.com/show_bug.cgi?id=1744862	2020-04-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.04"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				29 Search vendor "Fedoraproject" for product "Fedora" and version "29"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				30 Search vendor "Fedoraproject" for product "Fedora" and version "30"		-		Affected
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
Libreoffice Search vendor "Libreoffice"		Libreoffice Search vendor "Libreoffice" for product "Libreoffice"				< 6.2.6 Search vendor "Libreoffice" for product "Libreoffice" and version " < 6.2.6"		-		Affected