CVE-2021-41556

Severity Score

10.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that can lead to Code Execution. If a victim executes an attacker-controlled squirrel script, it is possible for the attacker to break out of the squirrel script sandbox even if all dangerous functionality such as File System functions has been disabled. An attacker might abuse this bug to target (for example) Cloud services that allow customization via SquirrelScripts, or distribute malware through video games that embed a Squirrel Engine.

El archivo sqclass.cpp en Squirrel versiones hasta 2.2.5 y 3.x hasta 3.1 permite una lectura fuera de límites (en el intérprete del núcleo) que puede conllevar a una ejecución de código. Si una víctima ejecuta un script de Squirrel controlado por un atacante, es posible que el atacante salga del sandbox del script de Squirrel incluso si toda la funcionalidad peligrosa, como las funciones del sistema de archivos, ha sido deshabilitada. Un atacante podría abusar de este fallo para dirigirse (por ejemplo) a servicios en la nube que permitan la personalización por medio de SquirrelScripts, o distribuir malware mediante videojuegos que incorporen un Squirrel Engine

*Credits: N/A

CVSS Scores

NISTv3.1 10.0

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-09-22 CVE Reserved
2022-07-28 CVE Published
2024-04-16 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (5)

URL	Tag	Source
http://www.squirrel-lang.org/#download	Third Party Advisory

URL	Date	SRC
https://blog.sonarsource.com/squirrel-vm-sandbox-escape	2024-08-04

URL	Date	SRC
https://github.com/albertodemichelis/squirrel/commit/23a0620658714b996d20da3d4dd1a0dcf9b0bd98	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BV7SJJ44AGAX4ILIVPREIXPJ2GOG3FKV	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3FQILX7UUEERSDPMZP3MKGTMY2E7ESU	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Squirrel-lang Search vendor "Squirrel-lang"		Squirrel Search vendor "Squirrel-lang" for product "Squirrel"				<= 2.2.5 Search vendor "Squirrel-lang" for product "Squirrel" and version " <= 2.2.5"		-		Affected
Squirrel-lang Search vendor "Squirrel-lang"		Squirrel Search vendor "Squirrel-lang" for product "Squirrel"				>= 3.0 <= 3.1 Search vendor "Squirrel-lang" for product "Squirrel" and version " >= 3.0 <= 3.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				36 Search vendor "Fedoraproject" for product "Fedora" and version "36"		-		Affected