CVE-2022-0403

Bit File Manager – 100% free file manager for WordPress <= 5.2.2 - Subscriber+ Arbitrary File Creation/Upload/Deletion

2022-03-14 00:00
Luan Pedersini

Strategic Overview

Status
Patched in 5.2.3
Affected Plugin
File Manager
Affected Version
<= 5.2.2
CVSS
8.8High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2022-0403
View all File Manager vulnerabilities

At a glance

CVE-2022-0403 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the File Manager WordPress plugin, affecting versions <= 5.2.2. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). The issue is fixed in version 5.2.3; sites on affected versions should update now. Disclosed March 2022, reported by Luan Pedersini.

Vulnerability Overview

The Library File Manager WordPress plugin before 5.2.3 is using an outdated version of the elFinder library, which is known to be affected by security issues (CVE-2021-32682), and does not have any authorisation as well as CSRF checks in its connector AJAX action, allowing any authenticated users, such as subscriber to call it. Furthermore, as the options passed to the elFinder library does not restrict any file type, users with a role as low as subscriber can Create/Upload/Delete Arbitrary files and folders.

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 File Manager <= 5.2.2 takes a caller who can reach the endpoint. 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 File Manager the fix is 5.2.3: builds <= 5.2.2 are affected, anything from 5.2.3 onward is not.

Remediation

Update to version 5.2.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to File Manager: 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: File Manager 5.2.3 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2022-0403https://www.wordfence.com/threat-intel/vulnerabilities/id/02a6428f-beef-4491-ab5f-130a9e7924c2https://nvd.nist.gov/vuln/detail/CVE-2022-0403

Related records

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