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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2019 Cisco StarOS IPv4 Fragmentation Denial of Service Vulnerability 12 July 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco StarOS Publisher: Cisco Systems Operating System: Cisco Virtualisation Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-0369 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180711-staros-dos - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco StarOS IPv4 Fragmentation Denial of Service Vulnerability Severity: High Advisory ID: cisco-sa-20180711-staros-dos First Published: 2018 July 11 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvh29613 CVE-2018-0369 CVSS Score: Base 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X Summary * A vulnerability in the reassembly logic for fragmented IPv4 packets of Cisco StarOS running on virtual platforms could allow an unauthenticated, remote attacker to trigger a reload of the npusim process, resulting in a denial of service (DoS) condition. There are four instances of the npusim process running per Service Function (SF) instance, each handling a subset of all traffic flowing across the device. It is possible to trigger a reload of all four instances of the npusim process around the same time. The vulnerability is due to improper handling of fragmented IPv4 packets containing options. An attacker could exploit this vulnerability by sending a malicious IPv4 packet across an affected device. An exploit could allow the attacker to trigger a restart of the npusim process, which will result in all traffic queued toward this instance of the npusim process to be dropped while the process is restarting. The npusim process typically restarts within less than a second. 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: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20180711-staros-dos Affected Products * Vulnerable Products This vulnerability affects the following Cisco products running any release of the StarOS operating system prior to the first fixed release: + Cisco Virtualized Packet Core-Single Instance (VPC-SI) + Cisco Virtualized Packet Core-Distributed Instance (VPC-DI) + Cisco Ultra Packet Core (UPC) To determine whether a vulnerable release of Cisco StarOS is running on an affected instance, administrators can use the show version command in the device CLI. The following example shows the output of the command for a VPC?DI instance that is running Cisco StarOS Release 19.3.v5 (VPC?DI Release N4.2.5): [local]VPC-001# show version Active Software: Image Version: 19.3.v5 Image Build Number: 65002 Image Description: Deployment_Build Image Date: Wed Sep 14 05:35:14 EDT 2016 Boot Image: /flash/qvpc-di-19.3.v5.bin Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that the following products are not affected by this vulnerability: + Cisco ASR 5000 Series Aggregation Services Routers + Cisco Elastic Services Controllers (ESC) + Cisco Ultra Automation Services (UAS) Workarounds * There are no workarounds that address this vulnerability. Fixed Software * Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded 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. Customers Without Service Contracts Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Fixed Releases Customers should upgrade to an appropriate release as indicated in the following table: Cisco StarOS Release First Fixed Release for This Vulnerability N5.0 (21.0) Migrate to N5.1.11 (21.6.5) N5.1 (21.1) N5.1.11 (21.6.5) 21.3 21.3.15 21.4 Migrate to 21.5.7 21.5 21.5.7 21.6 21.6.4 21.7 Not vulnerable 21.8 Not vulnerable 21.9 Not vulnerable Customers with active service contracts can download fixed software releases from the Cisco File Exchange. 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. Source * This vulnerability was found during internal security testing. URL * https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20180711-staros-dos Revision History * +-----------------------------------------------------------------------------+ | Version | Description | Section | Status | Date | |----------+----------------------------+----------+---------+----------------| | 1.0 | Initial public release. | ? | Final | 2018-July-11 | +-----------------------------------------------------------------------------+ - ------------------------------------------------------------------------------- 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW0atPGaOgq3Tt24GAQhH2w//SDDkNV0LoLw3eZbcaxQPNmdXIZtLTQYf GRB8+tGjUBxEcIOz3e27EbOPWTI/lYphPd6UaCAlyeshnVHRpKXVkvUKAv0sdMXU 9GJnuDCpRqgCnPRbSnvQO6cPQLkwjzOmIHU24v44+NMD4vRbjq2Axj5LjgeX0wuR zeEjCiNqwqfin7/cthH9T7wVrdzD2cFEURqlk5E+x3bKXkJQ2LFzX7NMjqDIsE0a PjK0Gs1mOWWViR6aIKt2afKqSytJt/1KnwR3lOM4a1RA4Pj9IjI8moo5cgb5+fyG pm18HktquN6kklPqJlAnJ3ZPFSFr/WrsrdRcabIk1le7nZNUbYqOcBXOuzIQdgj2 miUuzMW7kyhx/Wqq9ug32PH1uYyIs1omv5YVaBDTa10DEq0IqnFnYKehRYn6q3l6 aEDJIt8gzGFpzKh1igpGNscMucJRgXpNpNpCTZrF3ds+NmPutbsqhhwcL+Qumke0 wEaIfEOqGU/BNAI+sIFsaihR9EFfMPiB9Qb+PIKpC1+hZWbV93ztT0uYINnfanXl 6cEVo+rEbUoBH+hHZvJluaZfjpQ+P0FfQUb2x9RlSQ59m6vVtiACE5sg59l21lNM xMo4nktqOX6pf7nWCrjB7OO0cZfDYoMjjl0hOZ7oXa6BW+DwRHa5eeiFUwulQP7w Jj22CObytj8= =6v/s -----END PGP SIGNATURE-----