Vulnerability · Published Aug 30, 2023 · Assigned by GitHub_M
CVE-2023-41039Sandbox escape via various forms of "format" in RestrictedPython
High 8.3
In plain English
A high-severity injection in RestrictedPython from zopefoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | restrictedpython | no fix listed | DEBIAN-CVE-2023-41039 |
| Debian:13 | restrictedpython | 6.2-1 | DEBIAN-CVE-2023-41039 |
| Debian:14 | restrictedpython | 6.2-1 | DEBIAN-CVE-2023-41039 |
| PyPI | restrictedpython | 5.4 | GHSA-xjw2-6jm9-rf67 |
| PyPI | restrictedpython | 6.2 | GHSA-xjw2-6jm9-rf67 |
| PyPI | restrictedpython | 5.4, 6.2 | PYSEC-2023-159 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| zopefoundation | RestrictedPython | < 5.4>= 6.0, < 6.1 |
Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L