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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0248 Cisco Elastic Services Controller Denial of Service Vulnerability 21 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Elastic Services Controller Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-1312 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esc-dos-4Gw6D527 - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Elastic Services Controller Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-esc-dos-4Gw6D527 First Published: 2021 January 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvv69484 CVE Names: CVE-2021-1312 CWEs: CWE-400 Summary o A vulnerability in the system resource management of Cisco Elastic Services Controller (ESC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) to the health monitor API on an affected device. The vulnerability is due to inadequate provisioning of kernel parameters for the maximum number of TCP connections and SYN backlog. An attacker could exploit this vulnerability by sending a flood of crafted TCP packets to an affected device. A successful exploit could allow the attacker to block TCP listening ports that are used by the health monitor API. This vulnerability only affects customers who use the health monitor API. 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-esc-dos-4Gw6D527 Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco ESC releases 5.3.0.94 and earlier. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. 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 ESC releases 5.3.0.102 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-esc-dos-4Gw6D527 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. 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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 iQIVAwUBYAkaDeNLKJtyKPYoAQhgew/6AyMzwGdEcWmz4D4uyCvPbSlpCVpd7K+T vE3o4sj3hA8G0ChswDV+LieHyMaMMmfDyoNGml53mh4LVz/hTb4p5xmwW5XvJa65 CetuYvgnItSewWCk6CwkzNAFDJeGBaEDc9dJWgUH7utv7mCerBFhXlofCRmbqEVQ aX4GNqmXPguiXt3fgI1mUGfRpEUkyoPxN0FShN0Hd3qGTaBoAEiTQC5svgm2WqQ7 qRHiBRSx/KPbl2h4QCHx88dLUM4RwWJL91IpTOH6LuH1xUizTbIH6PqB79gKs8TT 8m1xhr6tovD5JCs0wctBODmb78gnmAcvqgW9mn7m+oca4dqIMWoObUcImRkoXUNj Lh8NAsR64TeRmHDwttC8EGPWLOncwDqUmOaYA/VU25sXW+T9Go1cr77t1BNjSyqR ukK6cIUUT6acPizFcU8WA9eNl/xAFWpjCvD5gcFsnQKBV6ac9B+SFQwKKJrhxEY4 YoTu3UtjEbMWOhNSR/P1zd8xmVLR/Zyy1DMiXD+zzPMZY4oeUVvmdFM9uKOQ+s27 af6mcoJfJkctJve+KP7oLV3iWPtqOqwPPtpWJd7DOM/c+QsGMxP31C/awTGoDApJ cS7Ceq7pFYpkmVogzUmDIlmKysSa91ngnBZsjNgGGZBC5BVDC/YviYXUngCYQdzE LOBJQYEaxyE= =c/7l -----END PGP SIGNATURE-----