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ISC dhclient < 3.1-ESV-R1 / 4.1-ESV-R2 / 4.2.1-P1 Remote Code Execution

High

Synopsis

ISC dhclient does not strip or escape shell meta-characters, which can lead to remote code execution.

Description

ISC dhclient did not strip or escape certain shell meta-characters in responses from the dhcp server (like hostname) before passing the responses on to dhclient-script. Depending on the script and OS, this can result in execution of exploit code on the client.

Solution

Upgrade to 3.1-ESV-R1, 4.1-ESV-R2, or 4.2.1-P1, or later.