Vulnerability · Published Sep 6, 2023 · Assigned by GitHub_M
CVE-2023-41050Information disclosure through Python's "format" functionality in Zope AccessControl
Medium 6.8
In plain English
A medium-severity information exposure in AccessControl from zopefoundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
AccessControl provides a general security framework for use in Zope. 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. A fix has been introduced in versions 4.4, 5.8 and 6.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | accesscontrol | 6.2 | GHSA-8xv7-89vj-q48c |
| PyPI | accesscontrol | 5.8 | GHSA-8xv7-89vj-q48c |
| PyPI | accesscontrol | 4.4 | GHSA-8xv7-89vj-q48c |
| PyPI | accesscontrol | 4.4, 5.8, 6.2 | PYSEC-2026-2325 |
| PyPI | zope | 4.8.9 | GHSA-8xv7-89vj-q48c |
| PyPI | zope | 5.8.4 | GHSA-8xv7-89vj-q48c |
| PyPI | zope | 4.8.9, 5.8.4 | PYSEC-2026-2075 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| zopefoundation | AccessControl | AccessControl: < 4.4AccessControl: >= 5.0, < 5.8AccessControl: >= 6.0, < 6.2Zope: < 4.8.9Zope: >= 5.0.0, < 5.8.4 |
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N