CVE-2023-41039: Sandbox escape via various forms of "format" in RestrictedPython
First published: Wed Aug 30 2023(Updated: )
### Impact Python's "format" functionality allows someone controlling the format string to "read" all objects accessible through recursive attribute lookup and subscription from objects he can access. This can lead to critical information disclosure. With `RestrictedPython`, the format functionality is available via the `format` and `format_map` methods of `str` (and `unicode`) (accessed either via the class or its instances) and via `string.Formatter`. All known versions of `RestrictedPython` are vulnerable. ### Patches The issue will be fixed in 5.4 and 6.2. ### Workarounds There are no workarounds to fix the issue without upgrading. ### References * https://docs.python.org/3/library/stdtypes.html#str.format_map * http://lucumr.pocoo.org/2016/12/29/careful-with-str-format/ * https://www.exploit-db.com/exploits/51580 ### For more information If you have any questions or comments about this advisory: * Open an issue in the [RestrictedPython issue tracker](https://github.com/zopefoundation/RestrictedPython/issues) * Email us at [security@plone.org](mailto:security@plone.org) ### Credits Thanks for analysing and reporting the go to: * Abhishek Govindarasu * Ankush Menat * Ward Theunisse
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/RestrictedPython | >=6.0<=6.1 | 6.2 |
| pip/RestrictedPython | <=5.3 | 5.4 |
| Zope Restrictedpython | <5.4 | |
| Zope Restrictedpython | >=6.0<6.2 |
Remedy
https://github.com/zopefoundation/RestrictedPython/commit/4134aedcff17c977da7717693ed89ce56d54c120
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Reference Links
Frequently Asked Questions
What is CVE-2023-41039?
CVE-2023-41039 is a vulnerability in RestrictedPython, a restricted execution environment for Python, that allows for critical information disclosure through manipulated format strings.
How does the vulnerability in RestrictedPython impact Python?
The vulnerability allows an attacker to control the format string and gain unauthorized access to objects, potentially leading to critical information disclosure.
What is the severity of CVE-2023-41039?
The severity of CVE-2023-41039 is high, with a CVSS score of 8.3.
How can I fix the vulnerability in RestrictedPython?
To fix the vulnerability, update RestrictedPython to version 6.2 if using pip, or refer to the Zope RestrictedPython advisory for the appropriate fix.
Where can I find more information about CVE-2023-41039?
You can find more information about CVE-2023-41039 on the following references: - [GitHub Security Advisory](https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-xjw2-6jm9-rf67) - [NIST National Vulnerability Database](https://nvd.nist.gov/vuln/detail/CVE-2023-41039) - [GitHub Commit](https://github.com/zopefoundation/RestrictedPython/commit/4134aedcff17c977da7717693ed89ce56d54c120)
- collector/github-advisory-latest
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