Symfony 2.7.0 < 4.0.10 - Denial of Service
The PDOSessionHandler class allows to store sessions on a PDO connection. Under some configurations (see below) and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources. An application is vulnerable when: - It is using PDOSessionHandler to store its sessions; - And it uses MySQL as a backend for sessions managed by PDOSessionHandler; - And the SQL mode does not contain STRICT_ALL_TABLES or STRICT_TRANS_TABLES (check via SELECT @@sql_mode). POC: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44768.tgz |