Know every vulnerabilitybefore it knows you.
DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.
GHSA-f2p5-j6fg-5cxf
wagtailwagtailwagtailImpact
An authenticated admin user can trigger expensive rendition processing with purposefully crafted filter specs resulting in potentially service degradation.
The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.
Patches
Patched versions have been released as Wagtail 7.0.8, 7.3.3, 7.4.2.
Workarounds
For sites that cannot easily upgrade to a current supported version, the vulnerability can be patched by adding the following code to urls.py URL pattern declarations to override the vulnerable view.
from django.core.exceptions import PermissionDenied
from django.http import HttpResponseBadRequest
from django.shortcuts import get_object_or_404
from django.urls import path
from wagtail.admin import urls as wagtailadmin_urls
from wagtail.images.exceptions import InvalidFilterSpecError
from wagtail.images.permissions import permission_policy
from wagtail.images.views import preview
def patched_preview(request, image_id, filter_spec):
image = get_object_or_404(get_image_model(), id=image_id)
if not permission_policy.user_has_permission_for_instance(request.user, "change", image):
raise PermissionDenied
try:
filter_obj = Filter(spec=filter_spec)
except InvalidFilterSpecError:
return HttpResponseBadRequest("Invalid filter spec", content_type="text/plain")
allowed = {"original", "width", "height", "min", "max", "fill"}
if any(operation.method not in allowed for operation in filter_obj.operations):
return HttpResponseBadRequest("Invalid filter spec", content_type="text/plain")
return preview(request, image_id, filter_spec)
urlpatterns = [
# Example where the CMS admin is at /admin/.
# Add this before the Wagtail admin URLs registration, with the same sub-path.
path("admin/images/<int:image_id>/preview/<str:filter_spec>/", patched_preview)
path("admin/", include(wagtailadmin_urls)),
]
Acknowledgements
Many thanks to @0x1saac 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.org (view our security policy for more information).
Upload your own SBOM in CycloneDX 1.6 or higher (JSON) directly here to check your vulnerabilities.
Drag and drop some file here, or click to select
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
Browse More
Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.
Checkout DevGuard