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r57shell "hidden" feature
From: full_disclosure full_disclosure <fulll_disclosure () yahoo com>
Date: Thu, 7 Sep 2006 11:11:02 -0700 (PDT)


Doing some forensics I found that R57shell(version 1.31) a widely used php shell by RST/GHC, has some "hidden 
features", it will log any usage to some russian stats counters. If those counters log the ip, and the script is not 
protected by a password, they cand 0wn everything you 0wned. 

Starting from line 1469 we have 2 base64 encoded variables $c1 and $c2, at line 1592 the script will check if the 
variables are empty and die() if true, then they are decoded and appended to $f, which is echo-ed at line 2204. $f 
contains only the counters scripts. 

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