CVE-2021-32633
CVE-2021-32633 — Remote Code Execution via traversal in TAL expressions
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.
Published Updated Sources: cvelistV5, GitHub_M
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.
Exploitation
Unreported
no source claims exploitation
EPSS
2%
chance of exploitation in 30 days
CVSS base
6.8
MEDIUM
Affected scope
The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.
Vendors (1)
Products (1)
Every base score collected
Sources score independently and disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Source |
|---|---|---|---|---|---|
| 6.8 | CVSS 3.1 | MEDIUM | — | — | cvelistV5 |
Weakness & attack patterns
- CWE-22
Detection
Read off the CVSS vector and the weakness class. Starting points, not rules we have tested.
- Search application, proxy, and WAF logs for requests touching /edit, /editing, /role.
References
5 on the record
- github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36
x_refsource_CONFIRM
- github.com/zopefoundation/Zope/commit/1f8456bf1f908ea46012537d52bd7e752a532c91
x_refsource_MISC
- www.openwall.com/lists/oss-security/2021/05/21/1
mailing-list, x_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/05/22/1
mailing-list, x_refsource_MLIST
- cyllective.com/blog/post/plone-authenticated-rce-cve-2021-32633/
x_refsource_MISC
Elsewhere on this site
- zopefoundationevery CVE for this vendor
- CWE-22other pages naming this weakness
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.