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, as demonstrated by a hostname that is provided to dhclient-script.
https://www.isc.org/software/dhcp/advisories/cve-2011-0997
https://www.exploit-db.com/exploits/37623/
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12812
https://exchange.xforce.ibmcloud.com/vulnerabilities/66580
https://bugzilla.redhat.com/show_bug.cgi?id=689832
http://www.vupen.com/english/advisories/2011/1000
http://www.vupen.com/english/advisories/2011/0965
http://www.vupen.com/english/advisories/2011/0926
http://www.vupen.com/english/advisories/2011/0915
http://www.vupen.com/english/advisories/2011/0909
http://www.vupen.com/english/advisories/2011/0886
http://www.vupen.com/english/advisories/2011/0879
http://www.ubuntu.com/usn/USN-1108-1
http://www.securityfocus.com/bid/47176
http://www.redhat.com/support/errata/RHSA-2011-0840.html
http://www.redhat.com/support/errata/RHSA-2011-0428.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:073
http://www.kb.cert.org/vuls/id/107886
http://www.debian.org/security/2011/dsa-2217
http://www.debian.org/security/2011/dsa-2216
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.593345
http://securitytracker.com/id?1025300
http://security.gentoo.org/glsa/glsa-201301-06.xml
http://secunia.com/advisories/44180
http://secunia.com/advisories/44127
http://secunia.com/advisories/44103
http://secunia.com/advisories/44090
http://secunia.com/advisories/44089
http://secunia.com/advisories/44048
http://secunia.com/advisories/44037
http://marc.info/?l=bugtraq&m=133226187115472&w=2
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058279.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/057888.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761