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[2007-02-13 02:00 UTC] richton at nbcs dot rutgers dot edu
Description:
------------
In PHP 5.2.1 and in snap 5.2 200702122330 the
safe_mode_exec_dir gets executed. This did not occur in PHP
5.2.0. I am using proc_open() here.
Reproduce code:
---------------
<?php
$descriptorspec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("pipe", "w"));
$process = proc_open("/bin/bash", $descriptorspec, $pipes);
?>
Expected result:
----------------
With safe mode off, expected result of /bin/bash getting
executed from PHP. (Note truss is like strace if you're used
to Linux.)
$ truss -f ./php -n ./execdir.php 2>&1 | grep execve
17635: execve("php", 0xFFBFFBE4, 0xFFBFFBF4) argc = 3
17636: execve("/bin/sh", 0xFFBFEFB8, 0xFFBFFBF4) argc = 3
17638: execve("/bin/bash", 0x0003A414, 0x0003A41C) argc = 1
Expected: That this result should be possible with an
appropriate safe_mode_exec_dir.
Actual result:
--------------
With safe mode on
$ truss -f ./php -n -d safe_mode=On -d safe_mode_exec_dir=/
bin ./execdir.php 2>&1 | grep execve
17642: execve("php", 0xFFBFFBAC, 0xFFBFFBCC) argc = 7
17643: execve("/bin/sh", 0xFFBFEF80, 0xFFBFFBCC) argc = 3
17645: execve("/bin/", 0x0003A408, 0x0003A410)
Err#13 EACCES
safe_mode_exec_dir "/bin" gets executed, despite code for "/
bin/bash." Note that this is not related to the incoming PHP
code at all:
$ truss -f ./php -n -d safe_mode=On -d
safe_mode_exec_dir=FOOBAR ./execdir.php 2>&1 | grep execve
17649: execve("php", 0xFFBFFBAC, 0xFFBFFBCC) argc = 7
17650: execve("/bin/sh", 0xFFBFEF80, 0xFFBFFBCC) argc = 3
17652: execve("FOOBAR/", 0x0003A408, 0x0003A410)
Err#2 ENOENT
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Last updated: Tue Mar 04 06:01:27 2025 UTC |
OK, gotcha. The expected result of $process = proc_open("/bin/bash", $descriptorspec, $pipes); is that PHP will attempt to execute "/bin/bash". This is the actual result with Safe Mode off. The actual result of that code with safe mode on is that it ignores "/bin/bash" and attempts to execute the safe_mode_exec_dir (absurd, really; you can't run a directory), *silently throwing away* my "/bin/bash" parameter. This would be like going to a command prompt, and (let's just assume that the safe_mode_exec_dir is /bin) typing "/bin/bash", and getting the message "/bin: is a directory." While that may be a true output, it's not what you typed -- if you type "/bin/bash", you expect "/bin/bash" to be attempted, and you certainly don't expect your input to be thrown away silently.