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Vigil@nce: ISC dhclient, shell command injection

April 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An attacker owning a malicious DHCP server can return a special
hostname, in order to inject a shell command in ISC dhclient.

 Severity: 2/4
 Creation date: 06/04/2011

IMPACTED PRODUCTS

 Debian Linux
 Mandriva Corporate
 Mandriva Enterprise Server
 Mandriva Linux
 OpenSUSE
 Red Hat Enterprise Linux
 Slackware Linux
 Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The ISC dhclient program queries a DHCP server, in order to obtain
an IP address and a computer name.

However, a malicious or corrupted DHCP server can return a
computer name like:
beginName`command`endName
beginName;command;endName
As dhclient does not filter special shell characters, the shell
command received from the server is run on the client.

An attacker owning a malicious DHCP server can therefore return a
special hostname, in order to inject a shell command in ISC
dhclient.

This vulnerability is the same as VIGILANCE-VUL-10530
(https://vigilance.fr/tree/1/10530) which impacts dhcpcd.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/ISC-dhclient-shell-command-injection-10522


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