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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1711 Cisco IOS XE Software IP Header Sanity Check Denial of Service Vulnerability 29 November 2013 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2013-6706 Original Bulletin: http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6706 - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Notice Cisco IOS XE Software IP Header Sanity Check Denial of Service Vulnerability http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6706 CVE ID: CVE-2013-6706 Release Date: 2013 November 27 22:58 UTC (GMT) Last Updated: 2013 November 27 22:58 UTC (GMT) Summary A vulnerability in the Cisco Express Forwarding processing module that checks the sanity of IP headers on Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, leading to a denial of service (DoS) condition. The vulnerability is due to improper processing of Multiprotocol Label Switching (MPLS) packets. When certain additional features are configured, an attacker could exploit this vulnerability by sending MPLS packets to traverse and exit an affected device as IP packets. An exploit could allow the attacker to cause the device to reload, leading to a DoS condition. Affected Products Product More Information CVSS Cisco IOS XE Software CSCuj23992 5.4/4.5 What Is a Cisco Security Notice? The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products. Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice. For additional information about Cisco PSIRT publications, see the Cisco Security Vulnerability Policy at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html Customers Using Third-Party Support Organizations Customers may have Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers. For these products, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed. Disclaimer THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUpf90RLndAQH1ShLAQJkJA//fxzofax312/kNQ6iGyXh8wbE2pR1UMqX Cov2dQrJtMD5F3mlCDL3kvm7qe9kQTtuAC9Xp3hqxgH+EgeMe3G979g6Cvtl/S4s 9rAAVW3iTjEDsoTXnh/07zZpfHpmlHjMo3FowrQ3RNqaUhqObcLQwlb4fKqbPqkN xWsxPmt5b39gypswgZ1BswigMzK0wklwsjEZJQ4NvnutpoVII/T5MKM8gVJLf0/j YG6gOBEX/vwHsYicrcS5MAaeTN8xYduxoZY20NNNiFHSrbY0iZy9TPLV9sdaNJ52 LSc5u6BcNmKFWIMtoILHjoU5Wh5oRppEpSBGnC1pD0bUEVKHUtI1v1l1uV7UsXnX HgT3NwhkA3UNps8RD0oKqgHtWSYMX9IkdFmdZJsr4Pz6iP5tNzIh8s/ENOcq/+LE YV+/FZxkDuwcBvgr7oQU3C7twm6HBFP0CTnw6sFFYD+9kPfOvjKe5eIRVI1cnAWO 3pNPCfcAfYf4Oh0NHLKjorDdI0bJlhaXBNJUfVH6gZvGu6ErWjBGi8Q6Ori7VTGy NP/s7yqE49mMjRfGB4k4qGiKiibOWVFEPVnKiXWg0yNl0yM2o75+DH1l3+nPARgf tj3Nl+310hPxg2czpFB+e2RWDKF2k4tzoTJszYsUK6rli0Y68Pxtbw1GRBljx63/ 6RtHTKCCiJU= =ku84 -----END PGP SIGNATURE-----