Grav: Incomplete callable validation in blueprint dynamic fields allows arbitrary static method invocation and file disclosure

• >= 2.0.7, <= 2.0.10

### Summary Grav CMS's blueprint dynamic-field callable guard can be bypassed with a fully-qualified `Class::method` string, letting an account with only page-editing rights (`admin.pages`, not super-admin) plant a directive in a page's form-field frontmatter that invokes an arbitrary public static PHP method with attacker-controlled arguments. Using built-in gadget methods this yields, at minimum, arbitrary reading of any server-readable file (disclosed to anonymous visitors of the crafted page) and arbitrary creation/copying of files and directories under the web-server account. ### Details `Blueprint::isSafeDynamicCall()` (`system/src/Grav/Common/Data/Blueprint.php`, method around line 488) is meant to block dangerous callables named in a blueprint's dynamic-field directives (`data-*@`). It only consults its dangerous-name denylist when the callable string does **not** contain `::`: ```php if (is_string($function) && !str_contains($function, '::') && Utils::isDangerousFunction($function)) { return false; } ``` Any callable string containing `::` — i.e. every `Class::method` static call — skips the check entirely and is passed to `call_user_func_array()` at `Blueprint::dynam

GitHub Advisory Database

• ECOSYSTEM: introduced 2.0.7; fixed 2.0.11

### Summary Grav CMS's blueprint dynamic-field callable guard can be bypassed with a fully-qualified `Class::method` string, letting an account with only page-editing rights (`admin.pages`, not super-admin) plant a directive in a page's form-field frontmatter that invokes an arbitrary public static PHP method with attacker-controlled arguments. Using built-in gadget methods this yields, at minimum, arbitrary reading of any server-readable file (disclosed to anonymous visitors of the crafted page) and arbitrary creation/copying of files and directories under the web-server account. ### Details `Blueprint::isSafeDynamicCall()` (`system/src/Grav/Common/Data/Blueprint.php`, method around line 488) is meant to block dangerous callables named in a blueprint's dynamic-field directives (`data-*@`). It only consults its dangerous-name denylist when the callable string does **not** contain `::`: ```php if (is_string($function) && !str_contains($function, '::') && Utils::isDangerousFunction($function)) { return false; } ``` Any callable string containing `::` — i.e. every `Class::method` static call — skips the check entirely and is passed to `call_user_func_array()` at `Blueprint::dynam

GitHub Advisory Database via OSV