Denial of Service (MySQL)
Summary#
Invicti identified a MySQL denial of service due to too many connections.
Several triggers cause this, including: possible DoS attack, high usage, not optimized MySQL server, or poorly developed server-side code.
Remediation#
In order to fix this problem, you should first determine what causes this. Some suggestions:
- Check
max_connectionssettings in the MySQL configuration file, which is located in the MySQL installation folder for Windows systems, and/etc/my.cnffor Unix/Linux-like systems. - Do not use persistent connections on your code. This is possible only for PHP systems by disabling it through the setting on
php.ini.mysql.allow_persistent=Off
- Ensure you explicitly close the database connections.
- Ensure you close opened database connections when an error occurs in the code.
- Lower the MySQL connection timeout.
Classifications#
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