Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXJwY2ctZjlxNi0ybXE2

Remote Code Execution via traversal in TAL expressions

This advisory extends the previous advisory at https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36 with additional cases of TAL expression traversal vulnerabilities.

Impact

Most Python modules are not available for using in TAL expressions that you can add through-the-web, for example in Zope Page Templates. This restriction avoids file system access, for example via the 'os' module. But some of the untrusted modules are available indirectly through Python modules that are available for direct use.

By default, you need to have the Manager role to add or edit Zope Page Templates through the web. Only sites that allow untrusted users to add/edit Zope Page Templates through the web are at risk.

Patches

The problem has been fixed in Zope 5.21 and 4.6.1.

Workarounds

The workaround is the same as for https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36: 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.

References

• The previous advisory (GHSA-5pr9-v234-jw36)

For more information

If you have any questions or comments about this advisory:

• Open an issue in the Zope issue tracker
• Email us at [email protected]

Permalink: https://github.com/advisories/GHSA-rpcg-f9q6-2mq6
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXJwY2ctZjlxNi0ybXE2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 3 years ago
Updated: 4 days ago

CVSS Score: 8.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-rpcg-f9q6-2mq6, CVE-2021-32674
References:

• https://github.com/zopefoundation/Zope/security/advisories/GHSA-rpcg-f9q6-2mq6
• https://github.com/zopefoundation/Zope/security/advisories/GHSA-5pr9-v234-jw36
• https://nvd.nist.gov/vuln/detail/CVE-2021-32674
• https://github.com/zopefoundation/Zope/commit/1d897910139e2c0b11984fc9b78c1da1365bec21
• https://github.com/pypa/advisory-database/tree/main/vulns/zope/PYSEC-2021-104.yaml
• https://pypi.org/project/Zope
• https://github.com/advisories/GHSA-rpcg-f9q6-2mq6

Repository: https://github.com/zopefoundation/Zope
Blast Radius: 18.1

Affected Packages