SoftwareUpdate for MacOS 10.1.x does not use authentication when downloading a software update, which could allow remote attackers to execute arbitrary code by posing as the Apple update server via techniques such as DNS spoofing or cache poisoning, and supplying Trojan Horse updates.

Point to Point Protocol daemon (pppd) in MacOS x 10.0 and 10.1 through 10.1.5 provides the username and password on the command line, which allows local users to obtain authentication information via the ps command.