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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0253 Cisco StarOS IPv4 Denial of Service Vulnerability 21 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco StarOS Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-1353 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr-mem-leak-dos-MTWGHKk3 - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco StarOS IPv4 Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-asr-mem-leak-dos-MTWGHKk3 First Published: 2021 January 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvq83868 CSCvv69023 CVE Names: CVE-2021-1353 CWEs: CWE-401 Summary o A vulnerability in the IPv4 protocol handling of Cisco StarOS could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory leak that occurs during packet processing. An attacker could exploit this vulnerability by sending a series of crafted IPv4 packets through an affected device. A successful exploit could allow the attacker to exhaust the available memory and cause an unexpected restart of the npusim process, leading to a DoS condition on the affected device. 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-asr-mem-leak-dos-MTWGHKk3 Affected Products o Vulnerable Products At the time of publication, this vulnerability affected the following Cisco products if they were running a release of Cisco StarOS earlier than Release 21.22.0 and had the Vector Packet Processing (VPP) feature enabled: ASR 5000 Series Aggregation Services Routers Virtualized Packet Core-Single Instance (VPC-SI) The VPP feature is disabled by default. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Determine the VPP Configuration To see if the VPP feature is enabled, use the show task table process vpp_main all command. If the command output lists the vpp_main process, the feature is enabled. The following is a sample output with the VPP feature enabled: [local]swch# show task table process vpp_main all task parent cpu facility inst pid pri node facility inst pid ---- ---------------------------------------------- ------------------------- 1/0 vpp_main 1005729 5729 0 all - 0 0 Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories 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. Fixed Releases At the time of publication, Cisco StarOS releases 21.22.0 and later contained the fix for this vulnerability. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Exploitation and Public Announcements o 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 o This vulnerability was found during internal security testing. Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr-mem-leak-dos-MTWGHKk3 Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2021-JAN-20 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== 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 iQIVAwUBYAkj+ONLKJtyKPYoAQh0ORAAm9ixdv7Uqkg0tCmHAyHwS/QqOegVL6qc /wgT6zLp2mDjf7bPero8vZutsQYXl9+BneLd9GJ4/8J912Hqg+A/TaXfyzc56+lT OmrRPtzR8f6zvtzudXGnTP/aEJdnOTFCvWXIWRaUy3aG4uPtXnJohPsjyyZ3WW6J uRDgZTHtCZdZqvmORZjjaVqvRqkd76MRYsKNziD79IclIsmzWk74G49P0oCZSM35 BqKdzpobxWXCeMd2OQE7z/bap0X5CTmMOFEsltOqPMNDEx16xYHim6vwKg+Fw13M BSTObzfuu36bdqGqi0B9HuUMFuM+sFMYJ/7KoLcU1SI6o7kilAtLzYAuJrcf78z9 yFuptFB1vXQARM9pPPrwBgQfGxUuvbEwa1vFoDOm892L0BrTqvmt/1L9U/0yzpC+ FgJ4St2P9UcUz6bVvd1Ffd9I1jnta/mCAAWtftjiin+SRJUTQqqyJKpFUpYGxz9N oDFXVIbf67xxiK0BGbVKcKZq26VIkTpELymJGWIkHLHw1bhwLEQCTVk5YRtqdGLE h8oUS5B6CFApE91px1AtDA8+0+V/53w/aKfYusr6Aygv+hMBVRvvdFft1dgOnJ7j dRxGvZRuPEIYojYPShtbCkGpXMVkE9r58vJTnzjqFHvhhWgz4fdqH+GKNGQ5Lmia MbEQfIS6OVo= =LZso -----END PGP SIGNATURE-----