{"id":486,"date":"2023-03-16T14:07:13","date_gmt":"2023-03-16T17:07:13","guid":{"rendered":"https:\/\/techsecurity.com.br\/?p=486"},"modified":"2023-03-16T14:07:48","modified_gmt":"2023-03-16T17:07:48","slug":"microsoft-corrige-outlook-zero-day-usado-por-hackers-russos-desde-abril-de-2022","status":"publish","type":"post","link":"https:\/\/techsecurity.com.br\/2023\/03\/microsoft-corrige-outlook-zero-day-usado-por-hackers-russos-desde-abril-de-2022\/","title":{"rendered":"Microsoft corrige falha 0day em Outlook usado por hackers russos"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A Microsoft corrigiu uma vulnerabilidade de 0day do Outlook CVE-2023-23397(https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2023-23397) explorada por um grupo de hackers vinculado ao servi\u00e7o de intelig\u00eancia militar da R\u00fassia GRU para atingir organiza\u00e7\u00f5es europeias.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A vulnerabilidade de seguran\u00e7a foi explorada em ataques para atingir e violar organiza\u00e7\u00f5es governamentais, militares, de energia e transporte entre meados de abril e dezembro de 2022.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O grupo de hackers (rastreado como APT28, STRONTIUM, Sednit, Sofacy e Fancy Bear) enviou notas e tarefas maliciosas do Outlook para roubar hashes NTLM por meio de solicita\u00e7\u00f5es de negocia\u00e7\u00e3o NTLM, for\u00e7ando os dispositivos dos alvos a se autenticarem em compartilhamentos SMB controlados pelo invasor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As credenciais roubadas foram usadas para movimenta\u00e7\u00e3o lateral nas redes das v\u00edtimas e para alterar as permiss\u00f5es da pasta da caixa de correio do Outlook, uma t\u00e1tica que permitia a exfiltra\u00e7\u00e3o de e-mail para contas espec\u00edficas.<\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">EoP cr\u00edtico no Outlook para Windows<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A vulnerabilidade (CVE-2023-23397) foi relatada pelo CERT-UA (Equipe de Resposta a Emerg\u00eancias de Computadores da Ucr\u00e2nia) e \u00e9 uma falha cr\u00edtica de seguran\u00e7a de eleva\u00e7\u00e3o de privil\u00e9gio do Outlook que pode ser explorada sem intera\u00e7\u00e3o do usu\u00e1rio em ataques de baixa complexidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Atores de amea\u00e7as podem explor\u00e1-lo enviando mensagens com propriedades MAPI estendidas contendo caminhos UNC para um compartilhamento SMB (TCP 445) sob seu controle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>&#8220;O invasor pode explorar essa vulnerabilidade enviando um e-mail especialmente criado que \u00e9 acionado automaticamente quando \u00e9 recuperado e processado pelo cliente Outlook. Isso pode levar \u00e0 explora\u00e7\u00e3o ANTES de o e-mail ser visualizado no painel de visualiza\u00e7\u00e3o&#8221;<\/em>, diz a Microsoft em um comunicado de seguran\u00e7a publicado hoje.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>\u201cA conex\u00e3o com o servidor SMB remoto envia a mensagem de negocia\u00e7\u00e3o NTLM do usu\u00e1rio, que o invasor pode retransmitir para autentica\u00e7\u00e3o em outros sistemas que suportam autentica\u00e7\u00e3o NTLM\u201d<\/em>, explica Redmond em uma postagem de blog separada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CVE-2023-23397 afeta todas as vers\u00f5es com suporte do Microsoft Outlook para Windows, mas n\u00e3o afeta as vers\u00f5es do Outlook para Android, iOS ou macOS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Al\u00e9m disso, como os servi\u00e7os online como o Outlook na Web e o Microsoft 365 n\u00e3o oferecem suporte \u00e0 autentica\u00e7\u00e3o NTLM, eles n\u00e3o s\u00e3o vulner\u00e1veis a ataques que exploram essa vulnerabilidade de retransmiss\u00e3o NTLM.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Microsoft recomenda corrigir imediatamente o CVE-2023-23397 para atenuar essa vulnerabilidade e impedir qualquer ataque recebido.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A empresa tamb\u00e9m aconselha adicionar usu\u00e1rios ao grupo Protected Users no Active Directory e bloquear o SMB de sa\u00edda (porta TCP 445) se o patch n\u00e3o for imediatamente poss\u00edvel, o que pode limitar o impacto do CVE-2023-23397.<\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\">Script de mitiga\u00e7\u00e3o e direcionamento<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Microsoft pede aos clientes que corrijam imediatamente seus sistemas contra CVE-2023-23397 ou adicionem usu\u00e1rios ao grupo de usu\u00e1rios protegidos no Active Directory e bloqueiem o SMB de sa\u00edda (porta TCP 445) como uma mitiga\u00e7\u00e3o tempor\u00e1ria para minimizar o impacto dos ataques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Redmond tamb\u00e9m lan\u00e7ou um script PowerShell dedicado para ajudar os administradores a verificar se algum usu\u00e1rio em seu ambiente Exchange foi alvo dessa vulnerabilidade do Outlook, que pode ser encontrado em <a href=\"https:\/\/microsoft.github.io\/CSS-Exchange\/Security\/CVE-2023-23397\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/microsoft.github.io\/CSS-Exchange\/Security\/CVE-2023-23397\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ele <em>&#8220;verifica os itens de mensagens do Exchange (correio, calend\u00e1rio e tarefas) para ver se uma propriedade \u00e9 preenchida com um caminho UNC&#8221;<\/em>, diz a Microsoft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>&#8220;Se necess\u00e1rio, os administradores podem usar este script para limpar a propriedade de itens maliciosos ou at\u00e9 mesmo excluir os itens permanentemente.&#8221;<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este script tamb\u00e9m permite modificar ou excluir mensagens potencialmente maliciosas se forem encontradas no Exchange Server auditado quando executadas no modo de limpeza.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Al\u00e9m da vulnerabilidade do outlook foram identificadas nove vulnerabilidades cr\u00edticas que permitem a execu\u00e7\u00e3o remota de c\u00f3digo, nega\u00e7\u00e3o de servi\u00e7o ou ataques de eleva\u00e7\u00e3o de privil\u00e9gios. Essas falhas de seguran\u00e7a s\u00e3o consideradas cr\u00edticas porque podem permitir que um atacante controle remotamente o sistema afetado ou comprometa a integridade dos dados armazenados.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os patches KB5023696 e KB5023697 do Windows 10 est\u00e3o sendo lan\u00e7ados para tratar quest\u00f5es de sistema e seguran\u00e7a em v\u00e1rias vers\u00f5es do sistema operacional, incluindo o Windows Server 2016. Essas atualiza\u00e7\u00f5es s\u00e3o obrigat\u00f3rias e ser\u00e3o instaladas automaticamente por meio do Windows Update, a menos que o usu\u00e1rio tenha realizado uma instala\u00e7\u00e3o modificada ou bloqueada. Al\u00e9m disso, uma pequena corre\u00e7\u00e3o de seguran\u00e7a e hiperlinks no Excel foi disponibilizada para o Windows 10 1507 por meio do patch KB5023713.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O n\u00famero de bugs em cada categoria de vulnerabilidade \u00e9 listado abaixo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>21 Vulnerabilidades de Eleva\u00e7\u00e3o de Privil\u00e9gio<\/li>\n\n\n\n<li>2 Vulnerabilidades de Bypass de Recursos de Seguran\u00e7a<\/li>\n\n\n\n<li>27 Vulnerabilidades de Execu\u00e7\u00e3o Remota de C\u00f3digo<\/li>\n\n\n\n<li>15 Vulnerabilidades de Divulga\u00e7\u00e3o de Informa\u00e7\u00f5es<\/li>\n\n\n\n<li>4 Vulnerabilidades de Nega\u00e7\u00e3o de Servi\u00e7o<\/li>\n\n\n\n<li>10 Vulnerabilidades de Spoofing<\/li>\n\n\n\n<li>1 Vulnerabilidade do Edge &#8211; Chromium<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Manter o Windows Update ativo e configurado para atualiza\u00e7\u00f5es autom\u00e1ticas \u00e9 uma pr\u00e1tica importante para garantir a seguran\u00e7a e o bom desempenho do seu computador.<br>Para ativar as atualiza\u00e7\u00f5es autom\u00e1ticas no Windows, siga estes passos:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1 &#8211; Clique no bot\u00e3o &#8220;Iniciar&#8221; e selecione &#8220;Configura\u00e7\u00f5es&#8221;.<br>2 &#8211; Selecione &#8220;Atualiza\u00e7\u00e3o e Seguran\u00e7a&#8221;.<br>3 &#8211; Clique em &#8220;Windows Update&#8221;.<br>4 &#8211; Clique em &#8220;Op\u00e7\u00f5es avan\u00e7adas&#8221;.<br>5 &#8211; Em &#8220;Escolha quando as atualiza\u00e7\u00f5es ser\u00e3o instaladas&#8221;, selecione &#8220;Autom\u00e1tico&#8221;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A partir de agora, o Windows ir\u00e1 buscar por atualiza\u00e7\u00f5es regularmente e instal\u00e1-las automaticamente, sem necessidade de interven\u00e7\u00e3o do usu\u00e1rio.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft corrige Outlook zero-day usado por hackers russos desde abril de 2022<\/p>\n","protected":false},"author":2,"featured_media":487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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