{"id":23430,"date":"2022-02-20T08:18:26","date_gmt":"2022-02-20T07:18:26","guid":{"rendered":"http:\/\/159.69.82.204\/win\/?p=23430"},"modified":"2024-10-05T21:35:01","modified_gmt":"2024-10-05T19:35:01","slug":"sicherheitsupdates-fr-cisco-e-mail-security-appliances-feb-2022","status":"publish","type":"post","link":"https:\/\/borncity.com\/win\/2022\/02\/20\/sicherheitsupdates-fr-cisco-e-mail-security-appliances-feb-2022\/","title":{"rendered":"Security Updates for Cisco Email Security Appliances (Feb. 2022)"},"content":{"rendered":"<p><img decoding=\"async\" title=\"Sicherheit (Pexels, allgemeine Nutzung)\" style=\"float: left; margin: 0px 10px 0px 0px; display: inline\" alt=\"Sicherheit (Pexels, allgemeine Nutzung)\" src=\"https:\/\/www.borncity.com\/blog\/wp-content\/uploads\/2021\/04\/Sicherheit_klein.jpg\" width=\"200\" align=\"left\">[<a href=\"https:\/\/www.borncity.com\/blog\/2022\/02\/20\/sicherheitsupdates-fr-cisco-e-mail-security-appliances-feb-2022\/\" target=\"_blank\" rel=\"noopener\">German<\/a>]Cisco has released security updates this week to close a highly classified vulnerability (CVE-2022-20653) in its email security appliances. Attackers were able to crash the e-mail security appliances via prepared e-mails and thus virtually launch a DoS attack. Affects Cisco AsyncOS software versions 14.0, 13.5, 13.0, 12.5 and older on Cisco ESA devices when DANE is enabled.<\/p>\n<p><!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" src=\"https:\/\/vg04.met.vgwort.de\/na\/f30f0f60dfaf424195bbffca1ba9f623\" width=\"1\" height=\"1\">I became aware of Cisco's <a href=\"https:\/\/web.archive.org\/web\/20221130231741\/https:\/\/tools.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-esa-dos-MxZvGtgU\" target=\"_blank\" rel=\"noopener\">security advisory<\/a> this week with the issue via various reports, including the following <a href=\"https:\/\/twitter.com\/TheHackersNews\/status\/1494543117839519751\" target=\"_blank\" rel=\"noopener\">tweet<\/a>. <\/p>\n<p><a href=\"https:\/\/twitter.com\/TheHackersNews\/status\/1494543117839519751\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" title=\"Cisco vulnerability (CVE-2022-20653) in Email Security Appliances\" alt=\"Cisco vulnerability (CVE-2022-20653) in Email Security Appliances\" src=\"https:\/\/i.imgur.com\/L0p8sHp.png\"><\/a><\/p>\n<p>A vulnerability exists in the DNS-based named entity authentication (DANE) component for email verification in Cisco AsyncOS software for Cisco Email Security Appliance (ESA). This vulnerability (CVE-2022-20653) is due to insufficient DNS name resolution error handling by the affected software. The vulnerability could allow an unauthenticated, remote attacker to cause a denial-of-service (DoS) condition on an affected device. <\/p>\n<p>An attacker could exploit this vulnerability by sending specially formatted email messages that are processed by an affected device. A successful attack could allow the attacker to render the device unreachable from the management interfaces or prevent further email messages from being processed for a period of time, resulting in a DoS condition. Continued attacks can cause the device to become completely unreachable, resulting in a persistent DoS condition.<\/p>\n<p>Cisco has released software updates that address this vulnerability, and there are workarounds for this vulnerability that Cisco addresses in the <a href=\"https:\/\/web.archive.org\/web\/20221130231741\/https:\/\/tools.cisco.com\/security\/center\/content\/CiscoSecurityAdvisory\/cisco-sa-esa-dos-MxZvGtgU\" target=\"_blank\" rel=\"noopener\">security advisory<\/a>. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[German]Cisco has released security updates this week to close a highly classified vulnerability (CVE-2022-20653) in its email security appliances. Attackers were able to crash the e-mail security appliances via prepared e-mails and thus virtually launch a DoS attack. Affects Cisco &hellip; <a href=\"https:\/\/borncity.com\/win\/2022\/02\/20\/sicherheitsupdates-fr-cisco-e-mail-security-appliances-feb-2022\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[580],"tags":[1079,195],"class_list":["post-23430","post","type-post","status-publish","format-standard","hentry","category-security","tag-sicherheit","tag-update"],"_links":{"self":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/23430","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/comments?post=23430"}],"version-history":[{"count":1,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/23430\/revisions"}],"predecessor-version":[{"id":35849,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/posts\/23430\/revisions\/35849"}],"wp:attachment":[{"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/media?parent=23430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/categories?post=23430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/borncity.com\/win\/wp-json\/wp\/v2\/tags?post=23430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}