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
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: WonderCMS 3.1.0 XSS / Directory Traversal / File Upload
SEC Consult Vulnerability Lab Security Advisory < 20200717-0 >
=======================================================================
title: Multiple Vulnerabilities
product: WonderCMS
vulnerable version: <=3.1.0
fixed version: -
CVE number: -
impact: High
homepage: https://www.wondercms.com/
found: 2020-04-30
by: Calvin Phang (Office Singapore)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Europe | Asia | North America
https://www.sec-consult.com
=======================================================================
Vendor description:
-------------------
"WonderCMS is a free simple website builder. Aimed to be extremely easy
to install (1 step), light and simple to use.It's an open source flat
file CMS (Content Management System), built with PHP and developed
since 2008."
Source: https://www.wondercms.com/
Business recommendation:
------------------------
The vendor did not respond to our communication attempts, hence no patch is
available.
An in-depth security analysis performed by security professionals is highly
advised, as the software may be affected from further security issues.
Vulnerability overview/description:
-----------------------------------
1. Stored Cross Site Scripting via Filename (Authenticated user)
This vulnerability allows an authenticated user (admin) to upload files
with a malicious client side script as filename. It will be executed in
the browser of a user if he visits the manipulated URL.
2. Directory Traversal (Authenticated user)
This vulnerability allows an authenticated user (admin) to delete arbitrary
files via directory traversal on the operating system with the access rights
of the web server.
3. Upload of arbitrary files (Authenticated user)
It was identified that an authenticated user (admin) can bypass file type
checks and upload malicious files. In this specific case, arbitrary server
side PHP code such as web shells can be uploaded. As a result the attacker
can run arbitrary code on the server side with the privileges of the web
server. This could lead to a full system compromise.
Proof of concept:
-----------------
1. Stored Cross Site Scripting via Filename (Authenticated user)
[ PoC has been removed as no patch is available and the vendor is unresponsive ]
2. Directory Traversal (Authenticated user)
[ PoC has been removed as no patch is available and the vendor is unresponsive ]
3. Upload of arbitrary files (Authenticated user)
[ PoC has been removed as no patch is available and the vendor is unresponsive ]
Vulnerable / tested versions:
-----------------------------
WonderCMS version 3.0.7 has been tested, which was the latest version
available at the time of the test. Previous versions may also be affected.
On 18-05-2020, the vendor released a newer version 3.1.0. However, the latest
version are still vulnerable to the above vulnerabilities.
Vendor contact timeline:
------------------------
2020-05-06: Contacting vendor through [email protected]; no response
2020-05-13: Follow-up with vendor; no response
2020-05-21: Follow-up with vendor; no response
2020-06-02: Follow-up with vendor; no response
2020-06-19: Follow-up with vendor; no response
2020-06-30: Tested the vulnerabilities in the latest version (3.1.0) that is
available on vendor's webpage, still affected.
2020-07-17: Public release of security advisory
Solution:
---------
The vendor did not respond to our communication attempts, hence no patch is
available.
Workaround:
-----------
None
Advisory URL:
-------------
https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SEC Consult Vulnerability Lab
SEC Consult
Europe | Asia | North America
About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Contact our local offices https://www.sec-consult.com/en/contact/index.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Mail: research at sec-consult dot com
Web: https://www.sec-consult.com
Blog: http://blog.sec-consult.com
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EOF C. Phang / @2020
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