CVE-2024-8932
📋 TL;DR
This vulnerability allows attackers to cause an integer overflow in PHP's ldap_escape() function on 32-bit systems by providing long string inputs, leading to out-of-bounds writes. This can potentially result in remote code execution or denial of service. Affected are PHP applications running on 32-bit systems that use the ldap_escape() function with untrusted input.
💻 Affected Systems
- PHP
📦 What is this software?
Ontap by Netapp
Php by Php
Php by Php
Php by Php
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service causing application crashes, or limited memory corruption leading to unpredictable behavior.
If Mitigated
No impact if proper input validation and length restrictions are implemented before calling ldap_escape().
🎯 Exploit Status
Exploitation requires sending specially crafted long strings to the ldap_escape() function, which may be accessible via web applications or APIs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: PHP 8.1.31, 8.2.26, 8.3.14
Vendor Advisory: https://github.com/php/php-src/security/advisories/GHSA-g665-fm4p-vhff
Restart Required: Yes
Instructions:
1. Update PHP to version 8.1.31, 8.2.26, or 8.3.14 depending on your branch. 2. Restart the web server (e.g., Apache, Nginx) or PHP-FPM service. 3. Verify the update with php -v.
🔧 Temporary Workarounds
Input Length Validation
allImplement input validation to restrict string length before passing to ldap_escape() function.
// PHP code example: if (strlen($input) > 1000) { die('Input too long'); }
Disable LDAP Extension
linuxRemove or disable the PHP LDAP extension if not required.
sudo apt remove php-ldap
sudo yum remove php-ldap
Comment out extension=ldap in php.ini
🧯 If You Can't Patch
- Implement strict input validation and length limits for all inputs to ldap_escape() function.
- Migrate to 64-bit systems where this vulnerability does not exist.
🔍 How to Verify
Check if Vulnerable:
Check PHP version with php -v and verify if it's below patched versions on a 32-bit system.Check Version:
php -v | grep 'PHP'Verify Fix Applied:
Confirm PHP version is 8.1.31, 8.2.26, or 8.3.14 or higher with php -v.📡 Detection & Monitoring
Log Indicators:
- Unusual long string inputs in application logs, PHP segmentation fault errors, or abnormal process crashes.
Network Indicators:
- Unexpected large payloads sent to endpoints using LDAP functionality.
SIEM Query:
source="php_error.log" AND ("segmentation fault" OR "out of bounds" OR "ldap_escape")