Symfony 2.7.0 < 4.0.10 - Denial of Service Exploit

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://github.com/offensive-security/exploit-database-bin-sploits/raw/master/bin-sploits/44768.tgz

#  0day.today [2018-05-30]  #