critical CVSS 9.8

CVE-2024-11236·PHP vulnerability

In PHP versions 8.1.* before 8.1.31, 8.2.* before 8.2.26, 8.3.* before 8.3.14, uncontrolled long string inputs to ldap_escape() function on 32-bit systems can cause an integer overflow, resulting in an out-of-bounds write.

Severity
critical
Software
PHP
Fixed in
8.3.14
Published
2024-11-24

Affected versions

From: 8.3.0

Until: 8.3.14

Fixed in: 8.3.14

How to fix this CVE

Update PHP to version 8.3.14 or later to patch a critical integer overflow vulnerability in the ldap_escape() function. This vulnerability affects 32-bit systems and can lead to out-of-bounds memory writes when processing excessively long input strings. Immediately apply the update through your distribution's package manager to eliminate this critical security risk.

sudo dnf update php

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your installed PHP version by running 'php -v' and verify it is below 8.3.14 if running PHP 8.3.x
  2. Step 2: Identify if ldap_escape() is used in your application by searching your codebase with 'grep -r "ldap_escape" /var/www/' or your application directory
  3. Step 3: Review web server access logs and PHP error logs for any LDAP-related errors or segmentation faults that may indicate exploitation attempts
  4. Step 4: After updating, re-run 'php -v' to confirm the new version is 8.3.14 or later and restart PHP-FPM with 'sudo systemctl restart php-fpm'

FAQ

What is CVE-2024-11236?

CVE-2024-11236 is a critical integer overflow vulnerability in PHP's ldap_escape() function on 32-bit systems. When processing abnormally long input strings, the function fails to properly validate the buffer size, causing an out-of-bounds write that can lead to memory corruption and potential code execution.

Is CVE-2024-11236 being actively exploited?

No, there is currently no evidence of active exploitation in the wild according to CISA records, and no public exploits are available. However, the critical CVSS 9.8 score and ease of triggering (no authentication required) warrant immediate patching.

What versions of PHP are affected by CVE-2024-11236?

PHP 8.1.0 through 8.1.30, PHP 8.2.0 through 8.2.25, and PHP 8.3.0 through 8.3.13 are vulnerable on 32-bit systems. The vulnerability is patched in PHP 8.1.31, 8.2.26, and 8.3.14 respectively.

How do I check if my server is vulnerable to CVE-2024-11236?

Run 'php -v' to check your version and 'uname -m' to verify if you are running a 32-bit system (i686 or i386 output indicates 32-bit). If your PHP version is below 8.3.14 on a 32-bit system and uses LDAP functionality, you are vulnerable.

Does Defensia detect CVE-2024-11236?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If PHP is installed on a monitored server, CVE-2024-11236 will appear in your dashboard with remediation steps.

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References

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