CVE-2021-32807— Zope 注入漏洞
一分钟漏洞结论
影响对象
zopefoundation AccessControl
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2021-32807 基础信息
漏洞信息
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Vulnerability Title
Remote Code Execution via unsafe classes in otherwise permitted modules
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
CWE-915
来源: CVE Program / CVE List V5
Vulnerability Title
Zope 注入漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zopefoundation | AccessControl | >= 4.0, < 4.3 | - |
|
二、漏洞 CVE-2021-32807 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-32807 补丁与修复 (1)
CVE-2021-32807 厂商安全公告 (1)
CVE-2021-32807 其他参考 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2021-32807
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