IBM Power Hardware Management Console (HMC) 7R3.5.0 before SP4, 7R7.1.0 and 7R7.2.0 before 7R7.2.0 SP3, and 7R7.3.0 before SP2, and Systems Director Management Console (SDMC) 6R7.3.0 before SP2, does not properly restrict the VIOS viosrvcmd command, which allows local users to gain privileges via vectors involving a (1) $ (dollar sign) or (2) & (ampersand) character.