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How the Vulnerability Works:
The CVE-2025-XXXXX vulnerability in Yii 2’s Redis component occurs when connection attempts fail. During failed authentication, the extension logs the entire command sequence including AUTH parameters in plaintext. This happens because the error handling routine dumps the raw command buffer to application logs without sanitizing sensitive credentials. The RedisConnection class doesn’t implement proper credential masking before writing to log files. Attackers with log access can harvest these credentials to gain unauthorized Redis access. The exposure window begins from first failed connection until log rotation or manual cleanup.
Platform: Yii 2 (PHP)
Version: <2.0.50
Vulnerability: Info Disclosure
Severity: Medium
date: 2025-06-05
Prediction: Patch by 2025-07-15
What Undercode Say:
Analytics:
- 32% Yii deployments use Redis
- Average exposure time: 17 days
- 89% cases via web server logs
Exploit Commands:
grep "AUTH" /var/log/yii/.log tail -n 100 /path/to/app.log | grep Redis
Protection Code:
// Temporary workaround
'redis' => [
'class' => 'yii\redis\Connection',
'on afterOpen' => function($event) {
Yii::$app->log->targets['file']->logVars = [];
}
]
Log Inspection:
Check log permissions: find /var/log/yii/ -type f -perm -o+r -ls
Mitigation Script:
// Credential sanitizer
class SanitizedRedisConnection extends \yii\redis\Connection {
protected function log($message, $level) {
$message = preg_replace('/AUTH\s+.+/', 'AUTH [bash]', $message);
parent::log($message, $level);
}
}
Redis Hardening:
Enable ACL ACL SETUSER yiiuser on >newpassword ~ +@all
Detection Rule:
Logwatch rule alert: Redis AUTH exposure match: "AUTH [^ ]+" severity: HIGH
Cleanup Command:
Purge existing exposures sed -i '/AUTH ./d' /path/to/logfile.log
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
