CVE-2021-24216

All-in-One WP Migration <= 7.40 - Authenticated (Admin+) Arbitrary File Upload

2022-02-07 00:00
Yiicheng Liu-Zte Chenfeng Lab

Strategic Overview

Status
Patched in 7.41
Affected Plugin
All-in-One WP Migration and Backup
Affected Version
<= 7.40
CVSS
7.2High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2021-24216
View all All-in-One WP Migration and Backup vulnerabilities

At a glance

CVE-2021-24216 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the All-in-One WP Migration and Backup WordPress plugin, affecting versions <= 7.40. 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 7.41; sites on affected versions should update now. Disclosed February 2022, reported by Yiicheng Liu-Zte Chenfeng Lab.

Vulnerability Overview

The All-in-One WP Migration plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation on file upload in versions up to, and including, 7.40. This makes it possible for authenticated attackers with administrative privileges to upload arbitrary files on the affected sites server which may make remote code execution possible.

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-434: Unrestricted Upload of File with Dangerous Type

Reaching this weakness in All-in-One WP Migration and Backup <= 7.40 takes an account at Admin level or above. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For All-in-One WP Migration and Backup the fix is 7.41: builds <= 7.40 are affected, anything from 7.41 onward is not.

Remediation

Update to version 7.41, 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: All-in-One WP Migration and Backup 7.41 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24216https://www.wordfence.com/threat-intel/vulnerabilities/id/6635ff4d-cbb4-4e78-9df1-1274eaa737aahttps://nvd.nist.gov/vuln/detail/CVE-2021-24216

Related records

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