CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
85.7%
The module AccessControl
defines security policies for Python code used in restricted code within Zope applications. Restricted code is any code that resides in Zope’s object database, such as the contents of Script (Python)
objects.
The policies defined in AccessControl
severely restrict access to Python modules and only exempt a few that are deemed safe, such as Python’s string
module. However, full access to the string
module also allows access to the class Formatter
, which can be overridden and extended within Script (Python)
in a way that provides access to other unsafe Python libraries. Those unsafe Python libraries can be used for remote code execution.
By default, you need to have the admin-level Zope “Manager” role to add or edit Script (Python)
objects through the web. Only sites that allow untrusted users to add/edit these scripts through the web - which would be a very unusual configuration to begin with - are at risk.
The problem has been fixed in AccessControl 4.3 and 5.2.
Only AccessControl versions 4 and 5 are vulnerable, and only on Python 3, not Python 2.7.
A site administrator can restrict adding/editing Script (Python)
objects through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing these scripts through the web should be restricted to trusted users only. This is the default configuration in Zope.
If you have any questions or comments about this advisory:
Vendor | Product | Version | CPE |
---|---|---|---|
zope | accesscontrol | * | cpe:2.3:a:zope:accesscontrol:*:*:*:*:*:*:*:* |
github.com/advisories/GHSA-qcx9-j53g-ccgf
github.com/pypa/advisory-database/tree/main/vulns/accesscontrol/PYSEC-2021-335.yaml
github.com/pypa/advisory-database/tree/main/vulns/accesscontrol/PYSEC-2021-370.yaml
github.com/pypa/advisory-database/tree/main/vulns/zope/PYSEC-2021-368.yaml
github.com/zopefoundation/AccessControl/blob/master/CHANGES.rst#51-2021-07-30
github.com/zopefoundation/AccessControl/commit/ae2dab0cc34e6dd1561c5b12d4a56cd140f87e1d
github.com/zopefoundation/AccessControl/commit/b42dd4badf803bb9fb71ac34cd9cb0c249262f2c
github.com/zopefoundation/AccessControl/security/advisories/GHSA-qcx9-j53g-ccgf
github.com/zopefoundation/Zope/commit/869f947e586517566509e0ccdd4d99b60704cc02
github.com/zopefoundation/Zope/commit/f72a18dda8e9bf2aedb46168761668464a4be988
github.com/zopefoundation/Zope/security/advisories/GHSA-g4gq-j4p2-j8fr
nvd.nist.gov/vuln/detail/CVE-2021-32807
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
85.7%