CVE-2021-24385

Filebird 4.7.3 - Unauthenticated SQL Injection

2021-06-16 00:00
Ravi Chandra (10up)

Strategic Overview

Status
Patched in 4.7.4
Affected Plugin
FileBird – WordPress Media Library Folders & File Manager
Affected Version
4.7.3
CVSS
9.8Critical
Weakness type
CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE
CVE-2021-24385
View all FileBird – WordPress Media Library Folders & File Manager vulnerabilities

At a glance

CVE-2021-24385 is a critical-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the FileBird WordPress plugin, affecting versions 4.7.3. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 4.7.4; sites on affected versions should update now. Disclosed June 2021, reported by Ravi Chandra (10up).

Vulnerability Overview

The Filebird Plugin 4.7.3 introduced a SQL injection vulnerability as it is making SQL queries without escaping user input data from a HTTP post request. This is a major vulnerability as the user input is not escaped and passed directly to the get_col function and it allows SQL injection. The Rest API endpoint which invokes this function also does not have any required permissions/authentication and can be accessed by an anonymous user.

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 privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Reaching this weakness in FileBird 4.7.3 takes no account at all. SQL injection happens when request data is concatenated into a query instead of being bound as a parameter, letting an attacker change the structure of the statement rather than just its values.

A working injection can read any table the database user can see, which on a WordPress install means user records, password hashes and session or API secrets stored in options. For FileBird the fix is 4.7.4: builds 4.7.3 are affected, anything from 4.7.4 onward is not.

Remediation

Update to version 4.7.4, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: FileBird 4.7.4 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24385https://www.wordfence.com/threat-intel/vulnerabilities/id/2491d502-8087-4e95-b047-a3b196322d94https://nvd.nist.gov/vuln/detail/CVE-2021-24385

Related records

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