zope accesscontrol 动态确定对象属性修改的控制不恰当

CVE编号

CVE-2021-32807

利用情况

暂无

补丁情况

N/A

披露时间

2021-07-31

漏洞描述

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.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://github.com/zopefoundation/AccessControl/blob/master/CHANGES.rst#51-2021-07-30
https://github.com/zopefoundation/AccessControl/commit/b42dd4badf803bb9fb71ac...
https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9...

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	zope	accesscontrol	*	From (including) 4.0	Up to (excluding) 4.3
	运行在以下环境
	应用	zope	accesscontrol	*	From (including) 5.0	Up to (excluding) 5.2

CVSS3评分 7.2

• 攻击路径 网络
• 攻击复杂度 低
• 权限要求 高
• 影响范围 未更改
• 用户交互 无
• 可用性 高
• 保密性 高
• 完整性 高

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CWE-ID 漏洞类型 CWE-915 动态确定对象属性修改的控制不恰当