Hard
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Remove filterRedelegate
A hard machine from VulnLab/Hack The Box that features domain user enumeration from MSSQL local auth as well as abusing Kerberos Constrained Delegation.
BlackGate
A Hard Linux Box by Offsec PG that revolves around exploiting Redis server.
Clue
A Hard Linux Box by Offsec PG Practice that involves exploiting a Cassandra Web installation for arbitrary file read.