Description

The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient.conf directives. When the lease file is subsequently re-parsed by dhclient, e.g., after a system restart, an attacker-controlled field from the lease is passed to dhclient-script(8), which evaluates it. A rogue DHCP server may be able to execute arbirary code as root on a system running dhclient.

Weaknesses 1

Affected Products 37

References 1

• security.freebsd.org https://security.freebsd.org/advisories/FreeBSD-SA-26:12.dhclient.asc
  Vendor Advisory

Remediation