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Estos ataques aprovechan una <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> descubierta el a&ntilde;o 2021, catalogada bajo el <a href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2021-21974\" target=\"_blank\" rel=\"noopener\">CVE-2021-21974<\/a>, y notificada por la compa&ntilde;&iacute;a en su respectivo&nbsp;<a href=\"https:\/\/www.vmware.com\/security\/advisories\/VMSA-2021-0002.html?idU=1\" target=\"_blank\" rel=\"noopener\">aviso de seguridad<\/a>.<\/p><p>Varios investigadores de seguridad afirman que podr&iacute;an haber&nbsp;<strong>m&aacute;s de 3200 servidores comprometidos<\/strong>, afectando a sistemas pertenecientes a distintas organizaciones ubicadas en varias partes del mundo, destacando Italia, Francia, Finlandia, EE. UU y Canad&aacute;. El fabricante public&oacute; una actualizaci&oacute;n de seguridad que soluciona el fallo.<\/p><p>La base de datos del NIST ha registrado la vulnerabilidad descrita, asign&aacute;ndole una puntuaci&oacute;n de acuerdo a la escala CVSSv3 de&nbsp;<strong>8.8<\/strong>. VMware, por su parte, tambi&eacute;n calific&oacute; esta vulnerabilidad descubierta el pasado a&ntilde;o 2021 como&nbsp;<strong>alta<\/strong>. Hasta la fecha, se conocen varios ataques de tipo <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/ransomware\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">ransomware<\/a> que han afectado a varios pa&iacute;ses, en concreto servidores que no se actualizaron cuando se hizo p&uacute;blica la <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a>. Por otro lado, se encuentra p&uacute;blica una prueba de concepto (PoC) con los detalles de la vulnerabilidad reportada:<\/p><ul><li><a href=\"https:\/\/packetstormsecurity.com\/files\/162957\/VMware-ESXi-OpenSLP-Heap-Overflow.html\" target=\"_blank\" rel=\"noopener\">VMware ESXi OpenSLP Heap Overflow<\/a><\/li><\/ul><h2>Recursos afectados<\/h2><p>Las vulnerabilidades reportadas afectan a las siguientes versiones:<\/p><ul><li>Versiones de VMware ESXi 7.x anteriores a ESXi70U1c-17325551<\/li><li>Versiones de ESXi 6.7x anteriores a ESXi670-20212401-SG<\/li><li>Versiones de ESXi 6.5.x anteriores a ESXi650-202102101-SG<\/li><\/ul><h2>Soluci&oacute;n<\/h2><p>VMware ha publicado el parche correspondiente para corregir la vulnerabilidad en los productos afectados. Como se ha indicado antes, se trata de una <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> descubierta en el pasado y, para la cual, existe una soluci&oacute;n desde el 23 de febrero de 2021. Por lo tanto, si no se ha hecho con anterioridad,&nbsp;<strong>se recomienda aplicar el parche correspondiente lo antes posible<\/strong>, debido a la explotaci&oacute;n de manera activa de la vulnerabilidad:<\/p><ul><li>VMware ESXi 7.x: Versi&oacute;n parcheada&nbsp;<a href=\"https:\/\/docs.vmware.com\/es\/VMware-vSphere\/7.0\/rn\/vsphere-esxi-70u1c.html\" target=\"_blank\" rel=\"noopener\">7.0 U1c<\/a>.<\/li><li>VMware ESXi 6.7.x: Versi&oacute;n parcheada&nbsp;<a href=\"https:\/\/docs.vmware.com\/es\/VMware-vSphere\/6.7\/rn\/esxi670-202102001.html\" target=\"_blank\" rel=\"noopener\">6.7 U3l<\/a>.<\/li><li>VMware ESXi 6.5.x: Versi&oacute;n parcheada&nbsp;<a href=\"https:\/\/docs.vmware.com\/es\/VMware-vSphere\/6.5\/rn\/esxi650-202102001.html\" target=\"_blank\" rel=\"noopener\">6.5 U3n<\/a>.<\/li><\/ul><p>En aquellos casos que no sea posible aplicar la actualizaci&oacute;n, o en servidores con una versi&oacute;n inferior a 6.5x, se recomienda deshabilitar el servicio vulnerable del <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/protocolo\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>protocolo<\/a> de ubicaci&oacute;n de servicios (SLP) en los hipervisores ESXi:<\/p><ul><li>Iniciar sesi&oacute;n en los servidores ESXi mediante sesi&oacute;n SSH.<\/li><li>Detener el servicio SLP (el servicio SLP solo se puede detener cuando el servicio no est&aacute; en uso):&nbsp;\/etc\/init.d\/slpd stop<\/li><li>Ejecutar el siguiente comando para deshabilitar el servicio:&nbsp;esxcli network <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/firewall\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>firewall<\/a> ruleset set -r CIMSLP -e 0<\/li><\/ul><p>El CCN-CERT recomienda encarecidamente a los usuarios y administradores de sistemas que realicen la actualizaci&oacute;n mencionada con el fin de evitar la exposici&oacute;n a ataques externos y la toma de control de los sistemas inform&aacute;ticos.<\/p><h2>Referencias<\/h2><ul><li><a href=\"https:\/\/www.vmware.com\/security\/advisories\/VMSA-2021-0002.html\" target=\"_blank\" rel=\"noopener\">VMSA-2021-0002<\/a><\/li><li><a href=\"https:\/\/darkfeed.io\/2023\/02\/04\/a-new-ransomware-attack-is-spreading-like-crazy\/\" target=\"_blank\" rel=\"noopener\">A new ransomware attack is spreading like crazy<\/a><\/li><li><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2021-21974\" target=\"_blank\" rel=\"noopener\">CVE-2021-21974<\/a><\/li><li><a href=\"https:\/\/www.europapress.es\/internacional\/noticia-ciberataque-masivo-provoca-problemas-informaticos-italia-20230205182005.html\" target=\"_blank\" rel=\"noopener\">Un ciberataque &ldquo;masivo&rdquo; provoca problemas inform&aacute;ticos en Italia<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Ataques que aprovechan una <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> descubierta en el a&ntilde;o 2021. VMware ha publicado el parche correspondiente. <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[4],"tags":[30,147],"class_list":["post-7178","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-vmware","tag-vulnerabilidad","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Campa\u00f1a de explotaci\u00f3n de vulnerabilidades de VMware ESXi - INFORDISA \/ Security Operations Center<\/title>\n<meta name=\"description\" content=\"Ataques que aprovechan una vulnerabilidad descubierta en el a\u00f1o 2021. 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