-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Cisco Security Advisory: Cisco NX-OS Software Crafted DHCPv4 Packet Denial of Service Vulnerability Advisory ID: cisco-sa-20161005-dhcp1 Revision: 1.0 For Public Release: 2016 October 5 16:00 GMT +------------------------------------------------------------------------------ Summary ======= A vulnerability in the implementation of the DHCPv4 relay agent and smart relay agent in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of crafted DHCPv4 offer packets. An attacker could exploit this vulnerability by sending crafted DHCPv4 offer packets to an affected device. An exploit could allow the attacker to cause the DHCP process or device to crash. This vulnerability can be exploited using IPv4 packets only. The vulnerability can be triggered by crafted DHCP packets processed by a DHCP relay agent or smart relay agent listening on the device using the IPv4 broadcast address or the IPv4 unicast address of any interface configured on a device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-dhcp1 -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJX9RRvAAoJEK89gD3EAJB5aJAP/iqU3jgnj8/ZfH9bDtTZzo/J lgymui54AgbK11rUmqDyzsPctHTzb/RONGNvozEMT29MgTw/5YKXGdEEdJpEcTRB n0btkc/5HJM0kS0wICLCQgwNdlmj+ERYuNIV8q9VwyPOSKoNQy/kKt4QRyzc2lbI E8nnrEyZZHYtt/eP7Ltgpy2YnXsP+ejzc8jPTYQXJiPById/mOINSjo+iw5Pr6O1 0L2De/WsiDHsWyBnOlljktupLWwxwVSNIYGO6nibMc7R878oB7MQs5/OymQq1CGH b2ed5nROf5QtFdo+pgRCjXw/87j40BNr1IKcCd7U9fzvzIGxF5JxDQ8lyzEJ5N/5 DOOlfa0CtQ4qwaP6lwOsO1mNrUjcNCDugmICucNo01VGyAReMLy+4vQBmD9AkByU cq51vQXe5C3PyU4quaDK15Ix1DM5Q3FJKRyaJ+6ScA0I27L9BSel7XamI9+IrD3N S9VKpjcZvXSauwfyQlnKilBNiQxbzQpt6a8UcX/EOx/sEu+G+fa64gPRcdi6nTKQ RTj+iqttSRJujQqYWVB1/5xK/VhNu3T8J7KssmS/gFXxmpCGebZLNT9ooiQQk2UY a6gaFcsNladvhr4Y8nltV+jLpCal9vD8og7B6dd0EU8XMvUxTTftP/xJANNghCa4 ks2Moj0fJ6Nfk7DYr8GW =uwR9 -----END PGP SIGNATURE-----
