CVE-2022-2439

Easy Digital Downloads – Simple eCommerce for Selling Digital Files <= 3.3.3 - Authenticated (Admin+) PHAR Deserialization

2024-09-23 00:00
Rasoul Jahanshahi

Strategic Overview

Status
Patched in 3.3.4
Affected Plugin
Easy Digital Downloads – eCommerce Payments and Subscriptions made easy
Affected Version
<= 3.3.3
CVSS
7.2High
Weakness type
CWE-502 · Deserialization of Untrusted Data
CVE
CVE-2022-2439
View all Easy Digital Downloads – eCommerce Payments and Subscriptions made easy vulnerabilities

At a glance

CVE-2022-2439 is a high-severity Deserialization of Untrusted Data vulnerability in the Easy Digital Downloads WordPress plugin, affecting versions <= 3.3.3. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 3.3.4; sites on affected versions should update now. Disclosed September 2024, reported by Rasoul Jahanshahi.

Vulnerability Overview

The Easy Digital Downloads – Simple eCommerce for Selling Digital Files plugin for WordPress is vulnerable to deserialization of untrusted input via the 'upload[file]' parameter in versions up to, and including 3.3.3. This makes it possible for authenticated administrative users to call files using a PHAR wrapper, that will deserialize and call arbitrary PHP Objects that can be used to perform a variety of malicious actions granted a POP chain is also present.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-502: Deserialization of Untrusted Data

Easy Digital Downloads <= 3.3.3 carries this weakness at upload[file], and reaching it takes an account at Admin level or above. Deserialization of untrusted data means the application reconstructs objects from input a caller controls, letting the attacker choose which classes get instantiated and what their properties hold.

A workable chain turns deserialization into file writes, deletions or code execution, depending on what the loaded classes do in their magic methods. For Easy Digital Downloads the fix is 3.3.4: builds <= 3.3.3 are affected, anything from 3.3.4 onward is not.

Remediation

Update to version 3.3.4, or a newer patched version

How does WordSec protect against this?

An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Easy Digital Downloads 3.3.4 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-2439https://www.wordfence.com/threat-intel/vulnerabilities/id/644c8702-08ad-4048-ae91-041f1771f1dchttps://nvd.nist.gov/vuln/detail/CVE-2022-2439

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C