Ben Edelman discovered a very simple, effective way that Sony BMG can notify customers that they have the rootkit on their system.
Since the Sony BMG CDs in question actually call home, there is a simple way for Sony to insert an advertisement into the XCP player, warning users they have the rootkit on their system.
Highlighted in green is call for a banner ad (currently nothing is there):
HTTP/1.1 302 Moved Temporarily
Set Cookie: ARPT=JKXVXZS188.8.131.52CKMJU; path=/
Date: Sat, 12 Nov 2005 18:36:49 GMT
Server: Apache/1.3.27 (Unix) mod_ssl/2.8.14 OpenSSL/0.9.7d
Keep Alive: timeout=10
Connection: Keep Alive
Transfer Encoding: chunked
Content Type: text/plain
By simply replacing it with his own, he was able to create an ad on the Sony BMG player with a warning.
<?xml version=”1.0″ encoding=”UTF-8″ ?>
<banner src=”http://www.benedelman.org/sony/image1.jpg” href=”http://cp.sonybmg.com/xcp/” time=”4000″ />
See Ben’s site for all details, and a screen shot of what an ad might look like. Link here.
Sony BMG: Do this. It’s a good idea.