CVE-2021-32633
Remote Code Execution via traversal in TAL expressions
Description
Zope is an open-source web application server. In Zope versions prior to 4.6 and 5.2, users can access untrusted modules indirectly through Python modules that are available for direct use. By default, only users with the Manager role can add or edit Zope Page Templates through the web, but sites that allow untrusted users to add/edit Zope Page Templates through the web are at risk from this vulnerability. The problem has been fixed in Zope 5.2 and 4.6. As a workaround, a site administrator can restrict adding/editing Zope Page Templates through the web using the standard Zope user/role permission mechanisms. Untrusted users should not be assigned the Zope Manager role and adding/editing Zope Page Templates through the web should be restricted to trusted users only.
How to fix CVE-2021-32633
To remediate CVE-2021-32633, upgrade the affected package to a fixed version below.
- —upgrade to 4.6 or later
- —upgrade to 4.6.1 or later
- —upgrade to 4.6 or later
- —upgrade to 5.2.1 or later
- —upgrade to 1d897910139e2c0b11984fc9b78c1da1365bec21 or later
- —upgrade to 1f8456bf1f908ea46012537d52bd7e752a532c91 or later
Is CVE-2021-32633 being exploited?
Low — EPSS is 0.9%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 4.6
- from 0, < 4.6.1
- from 0, < 4.6
- >= 5.0, < 5.2.1
- from 0, < 1d897910139e2c0b11984fc9b78c1da1365bec21 | >= 5.0, < 5.2.1, >= 4.0, < 4.6.1
- from 0, < 1f8456bf1f908ea46012537d52bd7e752a532c91 | from 0, < 4.6, >= 5.0, < 5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |