This bug was fixed in the package isc-dhcp - 4.2.4-1ubuntu7
---------------
isc-dhcp (4.2.4-1ubuntu7) quantal-proposed; urgency=low
* debian/dhclient-script.linux: Explicitly set the PATH to that of
ENV_SUPATH in /etc/login.defs and unset various other variables. We need
to do this so /sbin/dhclient cannot abuse the environment to escape
AppArmor confinement via this script. This can be removed once AppArmor
supports environment filtering (LP: 1045985). Don't worry about
debian/dhclient-script.linux.udeb or debian/dhclient-script.kfreebsd*
since AppArmor isn't used in these environments.
- LP: #1045986
isc-dhcp (4.2.4-1ubuntu6) quantal-proposed; urgency=low
* SECURITY UPDATE: denial of service via unexpected client identifiers
- debian/patches/CVE-2012-3570.patch: validate MAC length in
includes/dhcpd.h, server/dhcpv6.c.
- CVE-2012-3570
* SECURITY UPDATE: denial of service via malformed client identifiers
- debian/patches/CVE-2012-3571.patch: validate packets in
common/options.c, includes/dhcpd.h.
- CVE-2012-3571
* SECURITY UPDATE: denial of service via memory leaks
- debian/patches/CVE-2012-3954.patch: properly manage memory in
common/options.c and server/dhcpv6.c.
- CVE-2012-3954
-- Jamie Strandboge <ja...@ubuntu.com> Wed, 05 Sep 2012 08:59:49 -0500
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https://bugs.launchpad.net/bugs/1045986
Title:
Ubuntu AppArmor policy is too lenient with shell scripts
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