WP Easy Gallery <= 4.1.4 - Stored Cross-Site Scripting

2016-01-26 00:00
Rahul Pratap Singh

Strategic Overview

Status
Patched in 4.1.5
Affected Plugin
WP Easy Gallery – WordPress Gallery Plugin
Affected Version
< 4.1.5
CVSS
6.5Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all WP Easy Gallery – WordPress Gallery Plugin vulnerabilities

At a glance

This record tracks a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Easy Gallery WordPress plugin, affecting versions < 4.1.5. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity). The issue is fixed in version 4.1.5; sites on affected versions should update now. Disclosed January 2016, reported by Rahul Pratap Singh.

Vulnerability Overview

The WP Easy Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘custom_style’ parameter in versions before 4.1.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers to inject arbitrary web scripts in pages that execute whenever a victim accesses the injected page.

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')

WP Easy Gallery < 4.1.5 carries this weakness at custom_style, and reaching it 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 WP Easy Gallery the fix is 4.1.5: builds < 4.1.5 are affected, anything from 4.1.5 onward is not.

Remediation

Update to version 4.1.5, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WP Easy Gallery: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Easy Gallery 4.1.5 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/436d77d9-242a-452b-93d4-707881f59034

Related records

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