A crucial SQL injection vulnerability in FreePBX has emerged as a major risk to VoIP infrastructure worldwide, enabling attackers to control database contents and obtain arbitrary code execution.
FreePBX, a broadly deployed PBX system constructed across the open-source Asterisk VoIP platform, gives organizations with web-based administrative capabilities for managing telecommunications infrastructure.
The vulnerability, designated as CVE-2025-57819, permits malicious actors to inject SQL instructions by weak internet utility parameters, particularly concentrating on the system’s database administration features.
Risk actors have been actively exploiting this vulnerability to compromise FreePBX installations by subtle database manipulation methods.
The assault vector leverages the system’s ajax.php endpoint, the place insufficient enter sanitization permits SQL injection by the “model” parameter.
Attackers craft malicious GET requests containing SQL payloads that insert unauthorized entries into the cron_jobs database desk, successfully establishing persistent entry mechanisms throughout the compromised system.
Web Storm Heart analysts recognized this vulnerability in lively exploitation campaigns, observing attackers using the flaw to attain full system compromise.
The exploitation makes an attempt show superior methods that reach past easy database manipulation, incorporating components of persistence and stealth to take care of unauthorized entry whereas avoiding detection.
Database Manipulation and Code Execution Mechanism
The exploitation methodology entails injecting fastidiously crafted SQL statements into the FreePBX database by the weak model parameter in ajax.php requests.
A typical exploit payload seems as:-
GET /admin/ajax[.]php?module=FreePBXmodulesendpointajax&command=mannequin&template=x&mannequin=mannequin&model=x’ ;INSERT INTO cron_jobs (modulename,jobname,command,class,schedule,max_runtime,enabled,execution_order) VALUES (‘sysadmin’,’takdak’,’echo “PD9waHAgaGVhZGVyKCd4X3BvYzogQ1ZFLTIwMjUtNTc4MTknKTsgZWNobyBzaGVsbF9leGVjKCd1bmFtZSAtYScpOyB1bmxpbmsoX19GSUxFX18pOyA/Pgo=”|base64 -d ]/var/www/html/rspgf.php’,NULL,’* * * * *’,30,1,1) —
The malicious payload inserts a brand new entry into the cron_jobs desk, which FreePBX makes use of for scheduled process administration. The base64-encoded command, when decoded, reveals a PHP script containing:-
[ [?] php header ( ‘x_poc: CVE-2025-57819’); echo [shell _exec] (‘ uname – a’); unlink (__ [FILE] __); ? ]
This method transforms database manipulation into direct code execution by exploiting FreePBX’s cron job administration system, creating web-accessible PHP information that execute system instructions whereas implementing self-deletion mechanisms to evade forensic evaluation.
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