Описание
Improper validation of URLs ('Cross-site Scripting') in Wagtail rich text fields
Impact
When saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with javascript: URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.
Patches
Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).
Workarounds
For sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to a wagtail_hooks.py module in any installed app:
Acknowledgements
Many thanks to Kevin Breen for reporting this issue.
For more information
If you have any questions or comments about this advisory:
- Visit Wagtail's support channels
- Email us at security@wagtail.io (if you wish to send encrypted email, the public key ID is
0x6ba1e1a86e0f8ce8)
Ссылки
- https://github.com/wagtail/wagtail/security/advisories/GHSA-wq5h-f9p5-q7fx
- https://nvd.nist.gov/vuln/detail/CVE-2021-29434
- https://github.com/wagtail/wagtail/commit/5c7a60977cba478f6a35390ba98cffc2bd41c8a4
- https://github.com/wagtail/wagtail/commit/915f6ed2bd7d53154103cc4424a0f18695cdad6c
- https://github.com/pypa/advisory-database/tree/main/vulns/wagtail/PYSEC-2021-114.yaml
- https://github.com/wagtail/wagtail/compare/v2.11.6...v2.11.7
- https://pypi.org/project/wagtail
Пакеты
wagtail
<= 2.11.6
2.11.7
wagtail
>= 2.12, <= 2.12.3
2.12.4
Связанные уязвимости
Wagtail is a Django content management system. In affected versions of Wagtail, when saving the contents of a rich text field in the admin interface, Wagtail does not apply server-side checks to ensure that link URLs use a valid protocol. A malicious user with access to the admin interface could thus craft a POST request to publish content with `javascript:` URLs containing arbitrary code. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. See referenced GitHub advisory for additional details, including a workaround. Patched versions have been released as Wagtail 2.11.7 (for the LTS 2.11 branch) and Wagtail 2.12.4 (for the current 2.12 branch).