Shellshock: Bash executes commands embedded in environment variables — trivially exploitable via CGI, DHCP clients, SSH ForceCommand, and many other vectors. Patch Bash immediately across all Unix/Linux systems. Assume compromise if internet-exposed.
GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment. Shellshock.
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