Description (CNA)
Dancer2 versions from 2.1.0 before 2.2.0 for Perl serve files from outside public_dir via relative path segments in the File route handler. The handler joins the request path onto public_dir without collapsing relative segments, and checks only that the result is a readable regular file. A request for `/../outside.txt` escapes public_dir, and percent-encoding the dots reaches the same file. The handler is off by default. An application is affected once it names File in route_handlers and sets static_handler to 0, which otherwise refuses a dot segment before the route runs. Any file the worker process can read is served to an unauthenticated request, including the application's config.yml above public_dir.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Not supplied / Not supplied | affected 2.1.0 before 2.2.0 |
CWE
CWE-22
References
- https://github.com/PerlDancer/Dancer2/security/advisories/GHSA-6xw8-v24c-m783
- https://github.com/PerlDancer/Dancer2/commit/2446a09ffb83fef71cc75c327bd6e4b1f007b885.patch
- https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.