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CVE-2023-6553

9.8 CRITICAL
Remote Code Execution

📋 TL;DR

This vulnerability allows unauthenticated attackers to execute arbitrary code on WordPress servers running the vulnerable Backup Migration plugin. Attackers can exploit improper input validation in the backup-heart.php file to include malicious files and achieve remote code execution. All WordPress sites using Backup Migration plugin versions 1.3.7 and earlier are affected.

💻 Affected Systems

Products:
  • WordPress Backup Migration plugin
Versions: All versions up to and including 1.3.7
Operating Systems: Any OS running WordPress
Default Config Vulnerable: ⚠️ Yes
Notes: All installations are vulnerable by default; no special configuration required for exploitation.

📦 What is this software?

Backup Migration by Backupbliss

View all CVEs affecting Backup Migration →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete server compromise allowing attackers to install malware, steal sensitive data, deface websites, or use the server as part of a botnet.

🟠

Likely Case

Website defacement, data theft, cryptocurrency mining, or backdoor installation for persistent access.

🟢

If Mitigated

Limited impact if proper network segmentation, web application firewalls, and least privilege principles are implemented.

🌐 Internet-Facing: HIGH
🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes
Weaponized: CONFIRMED
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Exploit code is publicly available and requires minimal technical skill to execute.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.3.8 or later

Vendor Advisory: https://wordpress.org/plugins/backup-backup/#developers

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Backup Migration' and click 'Update Now'. 4. Verify version is 1.3.8 or higher.

🔧 Temporary Workarounds

Disable vulnerable plugin

linux

Temporarily disable the Backup Migration plugin until patched

mv /path/to/wp-content/plugins/backup-backup /path/to/wp-content/plugins/backup-backup.disabled

Block access to vulnerable endpoint

all

Use web server configuration to block access to /includes/backup-heart.php

# For Apache: add to .htaccess
<Files "backup-heart.php">
    Order Allow,Deny
    Deny from all
</Files>
# For Nginx: add to server block
location ~* /includes/backup-heart\.php$ {
    deny all;
    return 403;
}

🧯 If You Can't Patch

  • Immediately disable the Backup Migration plugin completely
  • Implement a web application firewall (WAF) with rules to block exploitation attempts

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel → Plugins → Backup Migration → Version number. If version is 1.3.7 or lower, you are vulnerable.

Check Version:

grep -r "Version:" /path/to/wp-content/plugins/backup-backup/backup-backup.php | cut -d: -f2

Verify Fix Applied:

After updating, verify version shows 1.3.8 or higher in WordPress admin panel.

📡 Detection & Monitoring

Log Indicators:

  • HTTP requests to /wp-content/plugins/backup-backup/includes/backup-heart.php with suspicious parameters
  • Unusual PHP process execution or file writes in WordPress directories

Network Indicators:

  • POST requests to backup-heart.php with encoded payloads
  • Sudden increase in traffic to the vulnerable endpoint

SIEM Query:

source="web_server_logs" AND uri="*backup-heart.php*" AND (method="POST" OR params="*include*" OR params="*php://*" OR params="*data://*")

📊 Metadata

CVE ID: CVE-2023-6553
CVSS v3 Score: 9.8 (CRITICAL)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: December 15, 2023
Last Updated: November 21, 2024

🔗 References

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