CVE-2023-41050

Advisory

AccessControl 4.4, 5.8 and 6.2 include a fix for CVE-2023-41050: 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.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-41050
• https://github.com/zopefoundation/AccessControl/commit/6bc32692e0d4b8d5cf64eae3d19de987c7375bc9
• https://github.com/zopefoundation/AccessControl/security/advisories/GHSA-8xv7-89vj-q48c