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CVE-2021-32807— Remote Code Execution via unsafe classes in otherwise permitted modules

Quick assessment

Affected
zopefoundation AccessControl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zope是Zope社区的一套使用Python语言编写的、面向对象的开源Web应用服务器。 Zope AccessControl存在注入漏洞。该漏洞源于用户输入构造命令、数据结构或记录的操作过程中，网络系统或产品缺乏对用户输入数据的正确验证，未过滤或未正确过滤掉其中的特殊元素，导致系统或产品产生解析或解释方式错误。

CVSS 4.4 · Medium EPSS 2.05% · P80

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32807

Vulnerability Information
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Vulnerability Title
Remote Code Execution via unsafe classes in otherwise permitted modules
Source: CVE Program / CVE List V5
Vulnerability Description
The module `AccessControl` defines security policies for Python code used in restricted code within Zope applications. Restricted code is any code that resides in Zope's object database, such as the contents of `Script (Python)` objects. The policies defined in `AccessControl` severely restrict access to Python modules and only exempt a few that are deemed safe, such as Python's `string` module. However, full access to the `string` module also allows access to the class `Formatter`, which can be overridden and extended within `Script (Python)` in a way that provides access to other unsafe Python libraries. Those unsafe Python libraries can be used for remote code execution. By default, you need to 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 - which would be a very unusual configuration to begin with - are at risk. The problem has been fixed in AccessControl 4.3 and 5.2. Only AccessControl versions 4 and 5 are vulnerable, and only on Python 3, not Python 2.7. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
Zope 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zope是Zope社区的一套使用Python语言编写的、面向对象的开源Web应用服务器。 Zope AccessControl存在注入漏洞。该漏洞源于用户输入构造命令、数据结构或记录的操作过程中，网络系统或产品缺乏对用户输入数据的正确验证，未过滤或未正确过滤掉其中的特殊元素，导致系统或产品产生解析或解释方式错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zopefoundation AccessControl >= 4.0, < 4.3 -

II. Public POCs for CVE-2021-32807

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III. Intelligence Information for CVE-2021-32807

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Patches & Fixes for CVE-2021-32807 (1)

Vendor Advisories for CVE-2021-32807 (1)

Other References for CVE-2021-32807 (1)

IV. Related Vulnerabilities

Same product: AccessControl
Same vendor: zopefoundation
Same weakness: CWE-915

V. Comments for CVE-2021-32807

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