Information disclosure in AccessControl

高 7.7CVE-2023-41050 · GHSA-8xv7-89vj-q48c · PYSEC-2026-2075 · 06/09/2023 公開 · 17/06/2026 更新

要点

CVE-2023-41050 は accesscontrol, zope, accesscontrol (zope) に影響する深刻度「高」 (CVSS 7.7) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.64%（全脆弱性の 50.7% より高い）。
対処：5.8, 6.2, 4.4, 5.8.4 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
accesscontrol PyPI	`≥ 5.0, < 5.8≥ 6.0, < 6.2< 4.4`	`5.86.24.4`
zope PyPI	`≥ 5.0.0, < 5.8.4< 4.8.9`	`5.8.44.8.9`
accesscontrol zope	`≥ 5.0, < 5.8≥ 6.0, < 6.2< 4.4`	`5.86.24.4`
zope zope	`≥ 5.0, < 5.8.4< 4.8.9`	`5.8.44.8.9`

概要

Impact

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.

Patches

A fix will be introduced in the versions 4.4, 5.8 and 6.2.

Workarounds

There are no workarounds.

References

https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-xjw2-6jm9-rf67 describes the corresponding problem for RestrictedPython.

NVD の説明

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.