CVE-2021-32807
Summary
| CVE | CVE-2021-32807 |
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| State | PUBLIC |
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| Assigner | [email protected] |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2021-07-30 22:15:00 UTC |
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| Updated | 2022-12-02 19:36:00 UTC |
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| 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. |
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NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
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| Application |
Zope |
Accesscontrol |
All |
All |
All |
All |
References
| Reference | Source | Link | Tags |
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| Merge pull request from GHSA-qcx9-j53g-ccgf · zopefoundation/AccessControl@b42dd4b · GitHub |
MISC |
github.com |
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| Remote Code Execution via unsafe classes in otherwise permitted modules · Advisory · zopefoundation/AccessControl · GitHub |
CONFIRM |
github.com |
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| AccessControl/CHANGES.rst at master · zopefoundation/AccessControl · GitHub |
MISC |
github.com |
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| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 981408 Python (pip) Security Update for AccessControl (GHSA-qcx9-j53g-ccgf)
