CVE-2021-32811

Description

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.

How to fix CVE-2021-32811

To remediate CVE-2021-32811, upgrade the affected package to a fixed version below.

• —upgrade to 4.3 or later
• —upgrade to 4.6.3 or later
• —upgrade to f72a18dda8e9bf2aedb46168761668464a4be988 or later

Is CVE-2021-32811 being exploited?

Low — EPSS is 2.3%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• >= 4.0, < 4.3, >= 5.0, < 5.2
• >= 4.0, < 4.6.3
• from 0, < f72a18dda8e9bf2aedb46168761668464a4be988 | >= 4.0, < 4.6.3, >= 5.0, < 5.3

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32811
• PATCHgithub.com/zopefoundation/Zope
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/zope/PYSEC-2021-368.yaml
• WEBgithub.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9-j53g-ccgf