CVE-2021-39354

Easy Digital Downloads <= 2.11.2 - Reflected Cross-Site Scripting

2021-10-21 16:05
Thinkland Security Team

Strategic Overview

Status
Patched in 2.11.2.1
Affected Plugin
Easy Digital Downloads – eCommerce Payments and Subscriptions made easy
Affected Version
<= 2.11.2
CVSS
4.8Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-39354
View all Easy Digital Downloads – eCommerce Payments and Subscriptions made easy vulnerabilities

At a glance

CVE-2021-39354 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Easy Digital Downloads WordPress plugin, affecting versions <= 2.11.2. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 2.11.2.1; sites on affected versions should update now. Disclosed October 2021, reported by Thinkland Security Team.

Vulnerability Overview

The Easy Digital Downloads WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the $start_date and $end_date parameters found in the ~/includes/admin/payments/class-payments-table.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.11.2.

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 Easy Digital Downloads <= 2.11.2 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 Easy Digital Downloads the fix is 2.11.2.1: builds <= 2.11.2 are affected, anything from 2.11.2.1 onward is not.

Remediation

Update to version 2.11.2.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Easy Digital Downloads: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Easy Digital Downloads 2.11.2.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-39354https://www.wordfence.com/threat-intel/vulnerabilities/id/56a362f3-dc4e-454d-9d94-9f4cb540d4b5https://nvd.nist.gov/vuln/detail/CVE-2021-39354

Related records

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