-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Cisco NX-OS Border Gateway Protocol Denial of Service Vulnerability Advisory ID: cisco-sa-20161005-bgp Revision 1.0 For Public Release 2016 October 5 16:00 UTC (GMT) +--------------------------------------------------------------------- Summary ======= A vulnerability in the Border Gateway Protocol (BGP) implementation of Cisco NX-OS System Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to the device unexpectedly reloading. The vulnerability is due to incomplete input validation of the BGP update messages. An attacker could exploit this vulnerability by sending a crafted BGP update message to the targeted device. An exploit could allow the attacker to cause the switch to reload unexpectedly. The Cisco implementation of the BGP protocol only accepts incoming BGP traffic from explicitly defined peers. To exploit this vulnerability, an attacker must be able to send the malicious packets over a TCP connection that appears to come from a trusted BGP peer, or inject malformed messages into the victim's BGP network. This would require obtaining information about the BGP peers in the affected system's trusted network. The vulnerability may be triggered when the router receives a malformed BGP message from a peer on an existing BGP session. At least one BGP neighbor session must be established for a router to be vulnerable. If all BGP peers to the NX-OS Software are Cisco IOS, IOS-XE, or IOS-XR devices and those devices are not configured for Cisco Multicast VPN (MVPN) interautonomous system support, this vulnerability cannot be remotely exploited. Cisco has released software updates that address this vulnerability. Workarounds that address this vulnerability are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-bgp -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (SunOS) iQIVAwUBV/JmXq89gD3EAJB5AQLJww/9FYyD6RKmaLKRJHLCSs594In2H0xpguNI WJS99FG1u6sffRLuM9lI+H38Q/cNotU3Z1Zd67goXppd+gLiSi1hxoEJkk0ogb35 mttvlDNkEwP/0P9O5dfLZTebdZHE+udmp6+K1O7S1y3yTYWb758Ncoy+WDflcnkq 7ecvygPmQH2FZWcG+j5/zJJ7VSUbcqd0lpf+kqvzBpcxSfdXMeDaAd++oSycmzS4 VuBQosYsd5Ee+5tpA60WxBKVl6wMB29xq49x6YH/CRmA8EjTg5pzxYaoEvaTaQR5 lwGot9WYbqZpwqEZthipOR/tY5ADsC25N923Wr3f1yq2X8w5hyL9rVtXpCO38Dci +1CdgDS5wHRxA5HmcD4kUIX50hAXShXarT14qj9lc+eOKL1Ge61txg76EAxDmsCp qa/IfbdQYPWN+STfG5PO1h3rc0zLQRWQ9Y0ogyJ6wA9fGBMnBmY/mQFFuzJZXQ/b VIs/U0zs/BrHN0HQNrVYGJ02kZrYq7j+HmBeYK2RwEH9MkQ3w+BphmYhoy+nBx41 F5l53CI7hdaVTMcP1M+pb9g2P3NoVC1JfI9aKwGc46UEMh8ZFgFRcacnowtTdWbF KWlJ1yFmoPycxo8OwAtzPyA61LDbK9MRAttaeAwp+d5bIBope/q4StMb3bYIML4d tfn+bcAL/SA= =rEVW -----END PGP SIGNATURE-----
