Synopsis
A Privilege Escalation through a Mass Assignment exists in Camaleon CMS
When a user wishes to change his password, the 'updated_ajax' method of the UsersController is called.
def updated_ajax
@user = current_site.users.find(params[:user_id])
update_session = current_user_is?(@user)
@user.update(params.require(:password).permit!)
render inline: @user.errors.full_messages.join(', ')
# keep user logged in when changing their own password
update_auth_token_in_cookie @user.auth_token if update_session && @user.saved_change_to_password_digest?
endThe vulnerability stems from the use of the dangerous permit! method, which allows all parameters to pass through without any filtering.
An attacker can exploit this vulnerability by submitting a request with an extra parameter that includes the role attribute allowing a user with limited privileges to become an administrator.
Solution
Disclosure Timeline
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