spomky-labs/otphp: Mass-assignment in Factory::loadFromProvisioningUri lets a hostile provisioning URI corrupt OTP state or leak an uncaught TypeError

• < 11.4.3

## Summary `OTPHP\Factory::loadFromProvisioningUri()` parses an attacker-supplied `otpauth://` URI and forwards **every** query key to `OTP::setParameter($key, $value)`. `setParameter()` resolves the name with `property_exists($this, $parameter)` and performs a dynamic write `$this->{$parameter} = $value` (`src/OTP.php:196-197`). Because the query keys are entirely controlled by whoever produced the URI, a URI can target the internal properties of the OTP object that are not meant to be set from a URI: `parameters`, `issuer`, `label`, `issuer_included_as_parameter`, and (on TOTP) the readonly `clock`. This is an instance of object property mass-assignment (CWE-915). ## Impact The `Factory` is documented as the entry point for third-party provisioning URIs (e.g. QR codes from Microsoft 365 / Google Authenticator). An application that loads such a URI is exposed to: - **State corruption.** A URI such as `otpauth://totp/Alice?secret=JBSWY3DPEHPK3PXP&parameters[foo]=bar` overwrites the whole internal `$parameters` array that `createFromSecret()` primed (`period`, `algorithm`, `digits`, `epoch`). The resulting object is silently unusable: `getProvisioningUri()`, `getDigits()`, `at()

GitHub Advisory Database

• ECOSYSTEM: introduced 0; fixed 11.4.3

## Summary `OTPHP\Factory::loadFromProvisioningUri()` parses an attacker-supplied `otpauth://` URI and forwards **every** query key to `OTP::setParameter($key, $value)`. `setParameter()` resolves the name with `property_exists($this, $parameter)` and performs a dynamic write `$this->{$parameter} = $value` (`src/OTP.php:196-197`). Because the query keys are entirely controlled by whoever produced the URI, a URI can target the internal properties of the OTP object that are not meant to be set from a URI: `parameters`, `issuer`, `label`, `issuer_included_as_parameter`, and (on TOTP) the readonly `clock`. This is an instance of object property mass-assignment (CWE-915). ## Impact The `Factory` is documented as the entry point for third-party provisioning URIs (e.g. QR codes from Microsoft 365 / Google Authenticator). An application that loads such a URI is exposed to: - **State corruption.** A URI such as `otpauth://totp/Alice?secret=JBSWY3DPEHPK3PXP&parameters[foo]=bar` overwrites the whole internal `$parameters` array that `createFromSecret()` primed (`period`, `algorithm`, `digits`, `epoch`). The resulting object is silently unusable: `getProvisioningUri()`, `getDigits()`, `at()

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