| Package | Affected versions | Patched versions |
|---|---|---|
| backpack/crud | ≥ 4.1.0, < 4.1.69≥ 5.0.0, < 5.0.13< 4.0.63 | 4.1.695.0.134.0.63 |
It’s a “moderate” vulnerability… but being an admin panel, take this seriously. It’s difficult… but an attacker could conduct a targeted phishing campaign, in order to trick your users or admins to click a malicious link, which under very specific circumstances could give them information... or even admin access. It’s unlikely, but that’s not good enough in admin panels - It should be made impossible. That’s why you are bothered with this.
If you don’t have custom error views, the views provided by Backpack would output the exception message without escaping it, which made an attack possible using Reflected XSS, in some very specific circumstances (that we will not disclose). To fix those error views in Backpack 4.x and 5.x, please run:
composer update backpack/crud
php artisan backpack:fix
The problem has been patched in:
IMPORTANT! Running a
composer updateshould get you the patched version, but you also need to runphp artisan backpack:fixafterwards, to patch your published error views, if necessary.
Alternatively (if you don’t want to run composer update), you can manually look inside your error views in “resources/views/errors” and output e($exception->getMessage()) instead of $exception->getMessage(). That’s all there is to the fix, really.
Acted as soon as our team found it (last week of March 2022):
php artisan backpack:fix command;If you have any questions or comments about this advisory:
PS. You can read this blog post for more information.
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