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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0939 Cisco IOS XR for Cisco ASR 9000 Series Aggregation Services Routers Interface Flap Vulnerability 13 April 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco ASR 9000 Series Routers Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-1376 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160412-asr - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco IOS XR for Cisco ASR 9000 Series Aggregation Services Routers Interface Flap Vulnerability Medium Advisory ID: cisco-sa-20160412-asr Published: 2016 April 12 07:00 GMT Version 1.0: Final CVSS Score: Base - 4.3 Workarounds: No workarounds available Cisco Bug IDs: CSCuv78548 CVE-2016-1376 CWE-20 Summary A vulnerability in packet processing functions of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause cyclic redundancy check (CRC) and symbol errors on the receiving interface of an affected device, which may lead to an interface flap. The vulnerability is due to improper processing of packets that contain certain crafted bit patterns. An attacker could exploit this vulnerability by sending crafted packets to be processed by a line card of an affected device. A successful exploit could allow the attacker to cause CRC and symbol errors on the receiving interface of the device, which may lead to an interface flap. 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-20160412-asr Affected Products Vulnerable Products Cisco IOS XR Software Releases 4.2.3, 4.3.0, 4.3.4, and 5.3.1 running on Cisco ASR 9000 Series Aggregation Services Routers are affected by this vulnerability. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Workarounds There are no workarounds that address this vulnerability. Fixed Software Information about fixed software is documented in the Cisco bug, which is accessible through the Cisco Bug Search Tool. When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to upgrade contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Exploitation and Public Announcements The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. URL http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160412-asr Revision History Version Description Section Status Date 1.0 Initial public release. Final 2016-April-12 Legal 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 standalone 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. The information in this document is intended for end users of Cisco products. - --------------------------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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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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 iQIVAwUBVw2my36ZAP0PgtI9AQLxvRAAmj3CZ/qy3bnY8oFL/8NaAneWyhDPr57w HfV1HE/sLQv7rLP+WKT8sqViOTxxWceeLacL893VEThet6nUiz44c9CbhRXhbBFv ygHfm/j+gLE+p2Cxn3R3sR2WZnj7DY3S3LTi76pGEanPk0/8XV7AJCCvvaxk3QRL HH1kYqBUxrtWn+jBOg6rtHhwPcyyIHUZr5oKss0EXFBgI/CcBVN8S7bws3o2ZnWo NDngjNdc/8faHW9q8jgp74r2HL6YIcPKqQ8GO3WFfK3EdkqqPv1zAIUBENQ7f4B6 2iZh6aLINL3kEn9F9iPJQqEMLcX8LPPg8DBXmBRk1yLc2LFadNMChGmU6bHKwU0v C24U0/Dt96Wh+21cr/zTzLPPbLI3N3aqz25kaHsbTZYZR8WkjoFtpbOwOcqDOEcm 4PRsmeiw4azkEtETW8+hfHr2GyQ8ih02ZmcMHWKUIUzJvmQHKvlsRmTHfcV22OII byB+rpY48Z2ISaKPSNLsplqOWtE9y77nJlsXrXEROZxLgJXErpqMwCJhbwn8UhNh 63J9gXU2uCwJni2X8usIndm01BfZCO1MQCMZi/HAY8zlyFd+FQgDllin6VOpemNb kwliguhCDZ7iozRAfWM+9syv68SAEAAb04nnxSAYFeTDOJFekA/ih6gCZF8SQ2+j XvovegEiySY= =+3NS -----END PGP SIGNATURE-----