CVE-2023-41050: Information disclosure through Python's "format" functionality in Zope AccessControl
First published: Wed Sep 06 2023(Updated: )
### Impact Python's "format" functionality allows someone controlling the format string to "read" objects accessible (recursively) via attribute access and subscription from accessible objects. Those attribute accesses and subscriptions use Python's full blown `getattr` and `getitem`, not the policy restricted `AccessControl` variants `_getattr_` and `_getitem_`. This can lead to critical information disclosure. `AccessControl` already provides a safe variant for `str.format` and denies access to `string.Formatter`. However, `str.format_map` is still unsafe. Affected are all users who allow untrusted users to create `AccessControl` controlled Python code and execute it. ### Patches A fix will be introduced in the versions 4.4, 5.8 and 6.2. ### Workarounds There are no workarounds. ### References https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-xjw2-6jm9-rf67 describes the corresponding problem for `RestrictedPython`.
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zope Accesscontrol | <4.4 | |
| Zope Accesscontrol | >=5.0<5.8 | |
| Zope Accesscontrol | >=6.0<6.2 | |
| Zope Zope | <4.8.9 | |
| Zope Zope | >=5.0<5.8.4 |
Remedy
https://github.com/zopefoundation/AccessControl/commit/6bc32692e0d4b8d5cf64eae3d19de987c7375bc9
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Reference Links
Frequently Asked Questions
What is the impact of CVE-2023-41050?
The vulnerability allows an attacker to read objects accessible via attribute access and subscription from accessible objects.
How does CVE-2023-41050 affect Zope and AccessControl?
Zope versions 4.8.9 and earlier, 5.8.4 and earlier, and 6.2 and earlier are affected. AccessControl versions 4.4 and earlier, 5.8 and earlier, and 6.2 and earlier are also affected.
What is the severity of CVE-2023-41050?
The severity of CVE-2023-41050 is rated as high, with a CVSS score of 7.7.
Are there any remedies or fixes available for CVE-2023-41050?
Yes, updating to Zope 5.8.4 or later, AccessControl 5.8 or later, or AccessControl 6.2 or later will address the vulnerability.
Where can I find more information about CVE-2023-41050?
You can find more information about CVE-2023-41050 at the following references: [GitHub Advisory](https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-8xv7-89vj-q48c), [NVD NIST](https://nvd.nist.gov/vuln/detail/CVE-2023-41050), [GitHub Commit](https://github.com/zopefoundation/AccessControl/commit/6bc32692e0d4b8d5cf64eae3d19de987c7375bc9).
- collector/nvd-api
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