CVE-2018-20368

Master Slider <= 3.7.0 - Authenticated Stored Cross-Site Scripting

2018-11-14 00:00

Strategic Overview

Status: Patched in 3.7.5
Affected Plugin: Master Slider – Responsive Touch Slider
Affected Version: <= 3.7.0
CVSS: 5.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2018-20368

View all Master Slider – Responsive Touch Slider vulnerabilities

At a glance

CVE-2018-20368 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Master Slider WordPress plugin, affecting versions <= 3.7.0. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 3.7.5; sites on affected versions should update now. Disclosed November 2018, reported by Vulnerability Lab.

Vulnerability Overview

The Master Slider plugin for WordPress has XSS via the wp-admin/admin-ajax.php Name input field of the MSPanel.Settings value on Callback.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Master Slider <= 3.7.0 takes any authenticated account. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Master Slider the fix is 3.7.5: builds <= 3.7.0 are affected, anything from 3.7.5 onward is not.

Remediation

Update to version 3.7.5, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Master Slider: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Master Slider 3.7.5 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-20368 https://www.wordfence.com/threat-intel/vulnerabilities/id/5015cfe7-9e5c-4745-b6c3-60e4aa99672d https://nvd.nist.gov/vuln/detail/CVE-2018-20368

Related records

Same weakness class

CVSS Vector

5.4

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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