Open-Xchange: A malicious user can upload a malicious script through managesieve and trigger its execution in order to consume almost 100% of CPU (LMTP).

Summary A malicious user can create a malicious sieve script attached as "test.sieve", upload it to the server through managesieve and set as active. Then the user can send several specially crafted messages to himself to trigger long script execution. The attacker has to send one message per...