CVE-2021-24248

Business Directory Plugin <= 5.11 - Authenticated PHP4 Upload

2021-04-11 00:00
0xB9

Strategic Overview

Status
Patched in 5.11.1
Affected Plugin
Business Directory Plugin – Easy Listing & Member Directories for WordPress
Affected Version
<= 5.11
CVSS
7.2High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2021-24248
View all Business Directory Plugin – Easy Listing & Member Directories for WordPress vulnerabilities

At a glance

CVE-2021-24248 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Business Directory Plugin WordPress plugin, affecting versions <= 5.11. 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. The issue is fixed in version 5.11.1; sites on affected versions should update now. Disclosed April 2021, reported by 0xB9.

Vulnerability Overview

The Business Directory Plugin – Easy Listing Directories for WordPress WordPress plugin before 5.11.1 did not properly check for imported files, forbidding certain extension via a blacklist approach, allowing administrator to import an archive with a .php4 inside for example, leading to RCE

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 Business Directory Plugin <= 5.11 takes any authenticated account. 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 Business Directory Plugin the fix is 5.11.1: builds <= 5.11 are affected, anything from 5.11.1 onward is not.

Remediation

Update to version 5.11.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Business Directory Plugin: 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: Business Directory Plugin 5.11.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24248https://www.wordfence.com/threat-intel/vulnerabilities/id/1e84fbbf-05b0-497b-81d8-1b029d24cdddhttps://nvd.nist.gov/vuln/detail/CVE-2021-24248

Related records

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