CVE-2021-32811

Remote Code Execution via Script (Python) objects under Python 3

Severity Score

7.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Zope is an open-source web application server. Zope versions prior to versions 4.6.3 and 5.3 have a remote code execution security issue. In order to be affected, one must use Python 3 for one's Zope deployment, run Zope 4 below version 4.6.3 or Zope 5 below version 5.3, and have the optional `Products.PythonScripts` add-on package installed. By default, one must have the admin-level Zope "Manager" role to add or edit Script (Python) objects through the web. Only sites that allow untrusted users to add/edit these scripts through the web are at risk. Zope releases 4.6.3 and 5.3 are not vulnerable. As a workaround, a site administrator can restrict adding/editing Script (Python) objects through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing these scripts through the web should be restricted to trusted users only. This is the default configuration in Zope.

Zope es un servidor de aplicaciones web de código abierto. Zope versiones anteriores a 4.6.3 y 5.3 tienen un problema de seguridad de ejecución de código remota . Para ser afectado, uno debe usar Python 3 para su despliegue de Zope, ejecutar Zope 4 por debajo de la versión 4.6.3 o Zope 5 por debajo de la versión 5.3, y tener el paquete adicional opcional "Products.PythonScripts" instalado. Por defecto, hay que tener el rol de "Manager" de Zope a nivel de administrador para añadir o editar objetos Script (Python) mediante la web. Sólo los sitios que permiten a usuarios no confiables añadir/editar estos scripts mediante la web están en riesgo. Zope versiones 4.6.3 y 5.3 no son vulnerables. Como solución, el administrador del sitio puede restringir la adición/edición de objetos Script (Python) mediante la web usando los mecanismos estándar de permisos de usuario/rol de Zope. Los usuarios que no son de confianza no se les debería asignar el rol de Administrador de Zope y añadir/editar estos scripts mediante la web debería estar restringido sólo a usuarios de confianza. Esta es la configuración predeterminada en Zope

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-05-12 CVE Reserved
2021-08-02 CVE Published
2024-08-03 CVE Updated
2024-10-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CAPEC

References (3)

URL	Tag	Source
https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9-j53g-ccgf	Third Party Advisory
https://github.com/zopefoundation/Zope/security/advisories/GHSA-g4gq-j4p2-j8fr	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/zopefoundation/Zope/commit/f72a18dda8e9bf2aedb46168761668464a4be988	2022-12-02

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zope Search vendor "Zope"		Accesscontrol Search vendor "Zope" for product "Accesscontrol"				>= 4.0 < 4.3 Search vendor "Zope" for product "Accesscontrol" and version " >= 4.0 < 4.3"		-		Affected
Zope Search vendor "Zope"		Accesscontrol Search vendor "Zope" for product "Accesscontrol"				>= 5.0 < 5.2 Search vendor "Zope" for product "Accesscontrol" and version " >= 5.0 < 5.2"		-		Affected
Zope Search vendor "Zope"		Zope Search vendor "Zope" for product "Zope"				>= 4.0 < 4.6.3 Search vendor "Zope" for product "Zope" and version " >= 4.0 < 4.6.3"		-		Affected
Zope Search vendor "Zope"		Zope Search vendor "Zope" for product "Zope"				>= 5.0 < 5.3 Search vendor "Zope" for product "Zope" and version " >= 5.0 < 5.3"		-		Affected