Описание
Sandbox escape via various forms of "format".
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
- Email us at security@plone.org
Credits
Thanks for analysing and reporting the go to:
- Abhishek Govindarasu
- Ankush Menat
- Ward Theunisse
Пакеты
RestrictedPython
<= 5.3
5.4
RestrictedPython
>= 6.0, <= 6.1
6.2
Связанные уязвимости
RestrictedPython is a restricted execution environment for Python to run untrusted code. 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. This issue has been addressed in commit `4134aedcff1` which has been included in the 5.4 and 6.2 releases. Users are advised to upgrade. There are no known workarounds for this vulnerability.
RestrictedPython is a restricted execution environment for Python to run untrusted code. 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. This issue has been addressed in commit `4134aedcff1` which has been included in the 5.4 and 6.2 releases. Users are advised to upgrade. There are no known workarounds for this vulnerability.
RestrictedPython is a restricted execution environment for Python to r ...