==================================================================== CERT-Renater Note d'Information No. 2016/VULN136 _____________________________________________________________________ DATE : 24/03/2016 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Cisco IOS XE, Cisco IOS. ====================================================================== http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-dhcpv6 http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-ios-ikev2 http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-smi _____________________________________________________________________ Cisco Security Advisory: Cisco IOS and IOS XE Software DHCPv6 Relay Denial of Service Vulnerability Advisory ID: cisco-sa-20160323-dhcpv6 Revision 1.0 For Public Release 2016 March 23 16:00 GMT +--------------------------------------------------------------------- Summary ======= A vulnerability in the DHCP version 6 (DHCPv6) relay feature of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to insufficient validation of DHCPv6 relay messages. An attacker could exploit this vulnerability by sending a crafted DHCPv6 relay message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. 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-20160323-dhcpv6 This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes six Cisco Security Advisories that describe six vulnerabilities. All the vulnerabilities have a Security Impact Rating of "High." For a complete list of advisories and links to them, see Cisco Event Response: http://www.cisco.com/c/en/us/about/security-center/event-response/cisco-erp-march-2016.html _____________________________________________________________________ Cisco Security Advisory: Cisco IOS and IOS XE Software Internet Key Exchange Version 2 Fragmentation Denial of Service Vulnerability Advisory ID: cisco-sa-20160323-ios-ikev2 Revision 1.0 For Public Release 2016 March 23 16:00 GMT +--------------------------------------------------------------------- Summary ======= A vulnerability in the Internet Key Exchange (IKE) version 2 (v2) fragmentation code of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of the affected system. The vulnerability is due to an improper handling of crafted, fragmented IKEv2 packets. An attacker could exploit this vulnerability by sending crafted UDP packets to the affected system. An exploit could allow the attacker to cause a reload of the affected system. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered by IPv4 and IPv6 traffic. Cisco has released software updates that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-ios-ikev2 This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes six Cisco Security Advisories that describe six vulnerabilities. All the vulnerabilities have a Security Impact Rating of "High." For a complete list of advisories and links to them, see Cisco Event Response: http://www.cisco.com/c/en/us/about/security-center/event-response/cisco-erp-march-2016.html _____________________________________________________________________ Cisco Security Advisory: Cisco IOS and IOS XE Software Smart Install Denial of Service Vulnerability Advisory ID: cisco-sa-20160323-smi Revision 1.0 For Public Release 2016 March 23 16:00 GMT +--------------------------------------------------------------------- Summary ======= The Smart Install client feature in Cisco IOS and IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to incorrect handling of image list parameters. An attacker could exploit this vulnerability by sending crafted Smart Install packets to TCP port 4786. A successful exploit could cause a Cisco Catalyst switch to reload, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability other than disabling Smart Install functionality on the vulnerable device. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160323-smi This advisory is part of the March 23, 2016, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes six Cisco Security Advisories that describe six vulnerabilities. All the vulnerabilities have a Security Impact Rating of "High." For a complete list of advisories and links to them, see Cisco Event Response: http://www.cisco.com/c/en/us/about/security-center/event-response/cisco-erp-march-2016.html ========================================================== Serveur de référence du CERT-Renater https://services.renater.fr/ssi/ ========================================================== + CERT-RENATER | tel : 01-53-94-20-44 + + 23 - 25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email: cert@support.renater.fr + ==========================================================