CVE-2018-5666

Coming Soon Page – Responsive Coming Soon & Maintenance Mode <= 1.1.18 - Cross-Site Scripting via bg_color parameter

2018-01-12 00:00

Strategic Overview

Status: Patched in 1.1.19
Affected Plugin: Coming Soon Page – Responsive Coming Soon & Maintenance Mode
Affected Version: <= 1.1.18
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2018-5666

View all Coming Soon Page – Responsive Coming Soon & Maintenance Mode vulnerabilities

At a glance

CVE-2018-5666 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Coming Soon Page WordPress plugin, affecting versions <= 1.1.18. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). The issue is fixed in version 1.1.19; sites on affected versions should update now. Disclosed January 2018, reported by d4wner.

Vulnerability Overview

An issue was discovered in the responsive-coming-soon-page plugin 1.1.18 for WordPress. XSS exists via the wp-admin/admin.php bg_color parameter.

Technical Analysis

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

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

Reaching this weakness in Coming Soon Page <= 1.1.18 takes a caller who can reach the endpoint. 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 Coming Soon Page the fix is 1.1.19: builds <= 1.1.18 are affected, anything from 1.1.19 onward is not.

Remediation

Update to version 1.1.19, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Coming Soon Page: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Coming Soon Page 1.1.19 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-5666 https://www.wordfence.com/threat-intel/vulnerabilities/id/e3891928-3780-426b-ae9c-e57b05ab3718 https://nvd.nist.gov/vuln/detail/CVE-2018-5666

Related records

Same weakness class

Other vulnerabilities in Coming Soon Page – Responsive Coming Soon & Maintenance Mode

CVSS Vector

5.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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