CVE-2021-24137 – This SQL injection vulnerability in the Blog2So... (How to Fix)

Q: What is the severity of CVE-2021-24137?

CVE-2021-24137 has a CVSS score of 8.8 (HIGH). This SQL injection vulnerability in the Blog2Social WordPress plugin allows authenticated users to execute arbitrary SQL commands through the Re-Share Posts feature. It affects WordPress sites running Blog2Social versions before 6.3.1, potentially compromising database integrity and confidentiality.

📋 TL;DR

This SQL injection vulnerability in the Blog2Social WordPress plugin allows authenticated users to execute arbitrary SQL commands through the Re-Share Posts feature. It affects WordPress sites running Blog2Social versions before 6.3.1, potentially compromising database integrity and confidentiality.

💻 Affected Systems

Products:

Blog2Social WordPress Plugin

Versions: All versions before 6.3.1

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Requires authenticated user access to exploit; affects WordPress installations with vulnerable plugin versions.

📦 What is this software?

Blog2social by Adenion

View all CVEs affecting Blog2social →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete database compromise leading to data theft, privilege escalation, or site takeover via SQL injection.

🟠

Likely Case

Data exfiltration from WordPress database including user credentials, sensitive content, or plugin data.

🟢

If Mitigated

Limited impact due to proper input validation and parameterized queries preventing SQL injection.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated user access; SQL injection via Re-Share Posts feature parameters.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 6.3.1

Vendor Advisory: https://wordpress.org/plugins/blog2social/#developers

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Blog2Social and click 'Update Now'. 4. Verify version is 6.3.1 or later.

🔧 Temporary Workarounds

Disable Re-Share Posts Feature

all

Temporarily disable the vulnerable Re-Share Posts feature until patching.

Restrict User Access

all

Limit authenticated user access to only trusted administrators.

🧯 If You Can't Patch

Remove or disable the Blog2Social plugin entirely
Implement web application firewall (WAF) rules to block SQL injection patterns

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Plugins > Blog2Social version number

Check Version:

wp plugin list --name=blog2social --field=version

Verify Fix Applied:

Confirm Blog2Social version is 6.3.1 or higher in WordPress plugins list

📡 Detection & Monitoring

Log Indicators:

Unusual SQL queries in WordPress/database logs
Multiple failed authentication attempts followed by Re-Share Posts activity

Network Indicators:

SQL injection patterns in HTTP POST requests to /wp-admin/admin-ajax.php

SIEM Query:

source="wordpress_logs" AND ("admin-ajax.php" AND "action=b2s" AND ("UNION" OR "SELECT" OR "INSERT" OR "DELETE"))

📊 Metadata

CVE ID: CVE-2021-24137

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-89

Published: March 18, 2021

Last Updated: November 21, 2024

🔗 References

https://wpscan.com/vulnerability/9eb94e55-765b-4df5-baea-b247ef72aef3 Exploit,Third Party Advisory
https://wpscan.com/vulnerability/9eb94e55-765b-4df5-baea-b247ef72aef3 Exploit,Third Party Advisory

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🔗 Related Vulnerabilities

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