Information disclosure through Python's "format" functionality in Zope AccessControl
CVE-2023-41050

6.8MEDIUM

Key Information:

Vendor

Zopefoundation

Status
Accesscontrol
Vendor
CVE Published:
6 September 2023

What is CVE-2023-41050?

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 Version(s)

AccessControl AccessControl: < 4.4 < AccessControl: 4.4

AccessControl AccessControl: >= 5.0, < 5.8 < AccessControl: 5.0, 5.8

AccessControl AccessControl: >= 6.0, < 6.2 < AccessControl: 6.0, 6.2

References

https://github.com/zopefoundation/AccessControl/security/...
x_refsource_CONFIRM
https://github.com/zopefoundation/AccessControl/commit/6b...
x_refsource_MISC

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.