CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
50.0%
A security researcher has disclosed a possible XSS vulnerability in the Blade templating engine.
Given the following two Blade templates:
resources/views/parent.blade.php:
@section('content')
<input value="{{ $value }}">
@show
resources/views/child.blade.php:
@extends('parent')
@section('content')
<input value="{{ $value }}">
@endsection
And a route like the following:
Route::get('/example', function() {
$value = '//localhost/###parent-placeholder-040f06fd774092478d450774f5ba30c5da78acc8## onclick=location.assign(this.value);//';
return view('child', ['value' => $value]);
});
The broken HTML element may be clicked and the user is taken to another location in their browser due to XSS. This is due to the user being able to guess the parent placeholder SHA-1 hash by trying common names of sections. If the parent template contains an exploitable HTML structure an XSS vulnerability can be exposed.
This vulnerability has been patched by determining the parent placeholder at runtime and using a random hash that is unique to each request.
Vendor | Product | Version | CPE |
---|---|---|---|
illuminate | view | * | cpe:2.3:a:illuminate:view:*:*:*:*:*:*:*:* |
laravel | framework | * | cpe:2.3:a:laravel:framework:*:*:*:*:*:*:*:* |
github.com/advisories/GHSA-66hf-2p6w-jqfw
github.com/FriendsOfPHP/security-advisories/blob/master/illuminate/view/CVE-2021-43808.yaml
github.com/FriendsOfPHP/security-advisories/blob/master/laravel/framework/CVE-2021-43808.yaml
github.com/laravel/framework/commit/b8174169b1807f36de1837751599e2828ceddb9b
github.com/laravel/framework/pull/39906
github.com/laravel/framework/pull/39908
github.com/laravel/framework/pull/39909
github.com/laravel/framework/releases/tag/v6.20.42
github.com/laravel/framework/releases/tag/v7.30.6
github.com/laravel/framework/releases/tag/v8.75.0
github.com/laravel/framework/security/advisories/GHSA-66hf-2p6w-jqfw
nvd.nist.gov/vuln/detail/CVE-2021-43808
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
50.0%