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: WordPress Popup Builder 3.69.6 Cross Site Scripting
# Exploit Title: WordPress Plugin Popup Builder 3.69.6 - Multiple Stored Cross Site Scripting
# Date: 11/27/2020
# Exploit Author: Ilca Lucian Florin
# Vendor Homepage: https://sygnoos.com
# Software Link: https://wordpress.org/plugins/popup-builder/ / https://popup-builder.com/
# Version: <= 3.69.6
# Tested on: Latest Version of Desktop Web Browsers: Chrome, Firefox, Microsoft Edge
The Popup Builder Responsive WordPress Pop up Subscription & Newsletter
Plugin is vulnerable to stored cross site scripting. There are multiple
parameters vulnerable to cross site scripting.
All versions up to 3.69.6 are vulnerable to stored cross site scripting.
More information about this plugin could be found on the following links:
1. https://wordpress.org/plugins/popup-builder/
2. https://popup-builder.com/
Cross site scripting (XSS) is a common attack vector that injects malicious
code into a vulnerable web application. XSS differs from other web attack
vectors (e.g., SQL injections), in that it does not directly target the
application itself. Instead, the users of the web application are the ones
at risk. A successful cross site scripting attack can have devastating
consequences for an online businesss reputation and its relationship with
its clients. Stored XSS, also known as persistent XSS, is the more damaging
of the two. It occurs when a malicious script is injected directly into a
vulnerable web application.
# How to reproduce #
1. Login as Editor or Administrator: https://website.com/wp-login/
2. Go to the following link:
https://website.com/wp-admin/edit.php?post_type=popupbuilder or search for
PopUp Builder and select or create new PopUp.
2. Click edit
3. Search and find: # Custom JS or CSS
4. On JS -> Opening events section, add two payloads, one for #2 section
and one for #3 section, like in the following example:
#2 Add the code you want to run before the popup opens. This will be the
code that will work in the process of opening the popup. true/false
conditions will not work in this phase.
<textarea class="wp-editor-area editor-content" data-attr-event="WillOpen"
placeholder=" #... type your code" mode="text/javascript"
name="sgpb-WillOpen">"><script
src="data:;base64,YWxlcnQoZG9jdW1lbnQuY29va2llKQ=="></script></textarea>
#3 Add the code you want to run after the popup opens. This code will work
when the popup is already open on the page.
<textarea class="wp-editor-area editor-content" data-attr-event="DidOpen"
placeholder=" #... type your code" mode="text/javascript"
name="sgpb-DidOpen">"><script
src="data:;base64,YWxlcnQoZG9jdW1lbnQuY29va2llKQ=="></script></textarea>
5. Click Update
6. Go to https://website.com. The XSS alert will pop up.
# All text-areas from JS section are vulnerable to stored cross site
scripting.
Evidence:
1. https://ibb.co/JvBTq0H
2. https://ibb.co/0KP7NFQ
3. https://ibb.co/3cFnVYF
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