ManageSieve vulnerabilities

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.

A vulnerability in managesieve allows an attacker to send a specially crafted message before authentication, causing excessive memory allocation. This can crash the managesieve-login process and make the protocol unavailable.

A vulnerability in ManageSieve causes the service to crash when processing the AUTHENTICATE command with a literal as the SASL initial response. This can be exploited to repeatedly crash the service, making it unavailable for other users.