A vulnerability has been found and corrected in ISC DHCP:

dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV
before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote
attackers to execute arbitrary commands via shell metacharacters in
a hostname obtained from a DHCP message (CVE-2011-0997).

Additionally for Corporate Server 4 and Enterprise Server 5 ISC DHCP
has been upgraded from the 3.0.7 version to the 4.1.2-P1 version
which brings many enhancements such as better ipv6 support.

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have upgraded to the 4.1.2-P1 version and patched
to correct this issue.