{"id":33247,"date":"2019-10-31T21:51:34","date_gmt":"2019-10-31T18:51:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi\/"},"modified":"2019-10-31T21:51:34","modified_gmt":"2019-10-31T18:51:34","slug":"reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/reliz-wordpress-5-2-s-podderzhkoj-proverki-obnovlenij-po-tsifrovoj-podpisi","title":{"rendered":"Lan\u00e7amento do WordPress 5.2 com suporte \u00e0 verifica\u00e7\u00e3o de atualiza\u00e7\u00f5es por assinatura digital","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/news\/2019\/05\/jaco\/\">Apresentado<\/a><\/noindex> lan\u00e7amento do sistema de gerenciamento de conte\u00fado web <noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/\">WordPress 5.2<\/a><\/noindex>. A vers\u00e3o \u00e9 not\u00e1vel pelo t\u00e9rmino <noindex><a rel=\"nofollow\" href=\"https:\/\/core.trac.wordpress.org\/ticket\/25052\">de uma epop\u00e9ia de seis anos<\/a><\/noindex> na implementa\u00e7\u00e3o <noindex><a rel=\"nofollow\" href=\"https:\/\/paragonie.com\/blog\/2019\/05\/wordpress-5-2-mitigating-supply-chain-attacks-against-33-internet\">da funcionalidade<\/a><\/noindex> de verifica\u00e7\u00e3o de atualiza\u00e7\u00f5es e complementos por assinatura digital. <\/p>\n<p>At\u00e9 agora, na instala\u00e7\u00e3o de atualiza\u00e7\u00f5es no WordPress, o principal fator de seguran\u00e7a era a confian\u00e7a na infraestrutura e servidores do WordPress (ap\u00f3s o download, era feita a verifica\u00e7\u00e3o do hash sem verifica\u00e7\u00e3o da fonte). Em caso de comprometimento dos servidores do projeto, os atacantes poderiam substituir a atualiza\u00e7\u00e3o e espalhar c\u00f3digo malicioso entre os sites baseados em WordPress que utilizam o sistema de instala\u00e7\u00e3o autom\u00e1tica de atualiza\u00e7\u00f5es. Com base no modelo de entrega de confian\u00e7a anteriormente aplicado, uma substitui\u00e7\u00e3o do lado dos usu\u00e1rios permaneceria indetect\u00e1vel. <\/p>\n<p>Considerando que, segundo <noindex><a rel=\"nofollow\" href=\"https:\/\/w3techs.com\/technologies\/overview\/content_management\/all\">dados<\/a><\/noindex> o projeto w3techs, a plataforma WordPress \u00e9 utilizada em 33.8% dos sites na rede, o incidente teria a magnitude de uma cat\u00e1strofe. Nesse contexto, o risco de comprometimento da infraestrutura n\u00e3o era hipot\u00e9tico, mas bem real. Por exemplo, h\u00e1 alguns anos, um dos pesquisadores de seguran\u00e7a <noindex><a rel=\"nofollow\" href=\"https:\/\/www.wordfence.com\/blog\/2016\/11\/hacking-27-web-via-wordpress-auto-update\/\">demonstrou<\/a><\/noindex> descobriu uma vulnerabilidade que permitia ao atacante executar seu c\u00f3digo no lado do servidor api.wordpress.org. <\/p>\n<p>No caso da utiliza\u00e7\u00e3o de assinaturas digitais, obter controle sobre o servidor de distribui\u00e7\u00e3o de atualiza\u00e7\u00f5es n\u00e3o resultaria na comprometimento dos sistemas dos usu\u00e1rios, uma vez que para realizar o ataque tamb\u00e9m seria necess\u00e1rio obter a chave privada armazenada separadamente, com a qual as atualiza\u00e7\u00f5es s\u00e3o assinadas. <\/p>\n<p>A implementa\u00e7\u00e3o da verifica\u00e7\u00e3o da fonte das atualiza\u00e7\u00f5es por assinatura digital foi dificultada pelo fato de que o suporte aos algoritmos criptogr\u00e1ficos necess\u00e1rios foi introduzido na entrega padr\u00e3o do PHP relativamente h\u00e1 pouco tempo. Os algoritmos criptogr\u00e1ficos necess\u00e1rios surgiram gra\u00e7as \u00e0 integra\u00e7\u00e3o da biblioteca <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49924\">Libsodium<\/a><\/noindex> no n\u00facleo do <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47652\">PHP 7.2<\/a><\/noindex>. Mas, como vers\u00e3o m\u00ednima suportada pelo WordPress, foi declarado <noindex><a rel=\"nofollow\" href=\"https:\/\/wordpress.org\/support\/article\/requirements\/\">o lan\u00e7amento 5.2.4 (a partir do WordPress 5.2 \u2014 5.6.20). A inclus\u00e3o do suporte a assinaturas digitais levaria a um aumento significativo nas exig\u00eancias para a vers\u00e3o m\u00ednima suportada do PHP ou \u00e0 adi\u00e7\u00e3o de uma depend\u00eancia externa, algo que os desenvolvedores n\u00e3o podiam fazer, considerando a dissemina\u00e7\u00e3o das vers\u00f5es do PHP nos sistemas de hospedagem.<\/a><\/noindex> lan\u00e7amento 5.2.4 (come\u00e7ando com WordPress 5.2 \u2014 5.6.20). A inclus\u00e3o do suporte a assinaturas digitais teria levado a um aumento significativo nas exig\u00eancias em rela\u00e7\u00e3o \u00e0 vers\u00e3o m\u00ednima suportada do PHP ou \u00e0 adi\u00e7\u00e3o de uma depend\u00eancia externa, o que os desenvolvedores n\u00e3o podiam fazer, considerando a preval\u00eancia das vers\u00f5es do PHP nos sistemas de hospedagem. <\/p>\n<p>o desenvolvimento <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45868\">desenvolvimento<\/a><\/noindex> e a inclus\u00e3o de uma vers\u00e3o compacta do Libsodium no WordPress 5.2 \u2014  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/paragonie\/sodium_compat\">Sodium Compat<\/a><\/noindex>, onde um conjunto m\u00ednimo de algoritmos para verifica\u00e7\u00e3o de assinaturas digitais foi implementado na linguagem PHP. A implementa\u00e7\u00e3o deixa a desejar em termos de desempenho, mas resolve completamente o problema de compatibilidade, al\u00e9m de permitir que os desenvolvedores de plugins comecem a incorporar algoritmos criptogr\u00e1ficos modernos.<\/p>\n<p>Para a forma\u00e7\u00e3o de assinaturas digitais, \u00e9 utilizado o algoritmo <noindex><a rel=\"nofollow\" href=\"https:\/\/ed25519.cr.yp.to\/\">Ed25519<\/a><\/noindex>, desenvolvido com a participa\u00e7\u00e3o de Daniel Bernstein (Daniel J. Bernstein). A assinatura digital \u00e9 gerada para o valor do hash SHA384, calculado a partir do conte\u00fado do arquivo de atualiza\u00e7\u00e3o. Ed25519 possui um n\u00edvel de seguran\u00e7a superior ao ECDSA e DSA, demonstrando uma velocidade muito alta na verifica\u00e7\u00e3o e cria\u00e7\u00e3o de assinaturas. A resist\u00eancia a ataques do Ed25519 \u00e9 da ordem de 2^128 (em m\u00e9dia, para atacar Ed25519, seriam necess\u00e1rias 2^140 opera\u00e7\u00f5es bit a bit), equivalente \u00e0 resist\u00eancia de algoritmos como NIST P-256 e RSA com tamanho de chave de 3000 bits ou um bloco de cifragem de 128 bits. Ed25519 tamb\u00e9m n\u00e3o \u00e9 suscet\u00edvel a problemas de colis\u00f5es em hashes, n\u00e3o \u00e9 sens\u00edvel a ataques via an\u00e1lise de tempos de cache e a ataques de canal lateral. <\/p>\n<p>Na vers\u00e3o do WordPress 5.2, a verifica\u00e7\u00e3o da assinatura digital abrange apenas as principais atualiza\u00e7\u00f5es da plataforma e n\u00e3o resulta, por padr\u00e3o, no bloqueio da atualiza\u00e7\u00e3o, mas apenas informa ao usu\u00e1rio sobre a ocorr\u00eancia de um problema. O bloqueio por padr\u00e3o n\u00e3o foi ativado imediatamente devido \u00e0 necessidade de uma verifica\u00e7\u00e3o completa e contorno  <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.php.net\/bug.php?id=75938\">de poss\u00edveis problemas<\/a><\/noindex>. No futuro, a verifica\u00e7\u00e3o por assinatura digital tamb\u00e9m ser\u00e1 planejada para a verifica\u00e7\u00e3o da fonte de instala\u00e7\u00e3o de temas e plugins (os fabricantes poder\u00e3o assinar lan\u00e7amentos com sua chave).<\/p>\n<p>Al\u00e9m do suporte a assinaturas digitais, o WordPress 5.2 traz as seguintes mudan\u00e7as:<\/p>\n<ul>\n<li class=\"l\"> Na se\u00e7\u00e3o 'Sa\u00fade do Site' foram adicionadas duas novas p\u00e1ginas para depurar problemas t\u00edpicos de configura\u00e7\u00e3o, al\u00e9m de um formul\u00e1rio atrav\u00e9s do qual os desenvolvedores podem deixar informa\u00e7\u00f5es de depura\u00e7\u00e3o para os administradores do site;\n<li class=\"l\"> Foi adicionada a implementa\u00e7\u00e3o da 'tela branca da morte', exibida em caso de problemas fatais, ajudando o administrador a corrigir problemas relacionados a plugins ou temas, acessando um modo especial de recupera\u00e7\u00e3o ap\u00f3s falhas;\n<li class=\"l\"> Foi implementado um sistema de verifica\u00e7\u00e3o de compatibilidade com plugins, que verifica automaticamente a possibilidade de uso do plugin na configura\u00e7\u00e3o atual, considerando a vers\u00e3o do PHP utilizada. Se uma vers\u00e3o mais nova do PHP for necess\u00e1ria para o funcionamento do plugin, o sistema bloquear\u00e1 automaticamente a ativa\u00e7\u00e3o deste plugin.\n<li class=\"l\"> Adicionada a suporta\u00e7\u00e3o para ativa\u00e7\u00e3o de m\u00f3dulos com c\u00f3digo JavaScript usando <noindex><a rel=\"nofollow\" href=\"https:\/\/webpack.js.org\/\">webpack<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/babeljs.io\/\">Babel<\/a><\/noindex>;\n<li class=\"l\"> Adicionado um novo modelo privacy-policy.php, permitindo personalizar o conte\u00fado da p\u00e1gina com os termos de conformidade de privacidade.\n<li class=\"l\"> Para os temas, foi adicionado um manipulador do hook wp_body_open, permitindo a inser\u00e7\u00e3o de c\u00f3digo logo ap\u00f3s a tag body.\n<li class=\"l\"> Os requisitos para a vers\u00e3o m\u00ednima do PHP foram elevados para 5.6.20, e agora \u00e9 poss\u00edvel usar namespaces e fun\u00e7\u00f5es an\u00f4nimas em plugins e temas.\n<li class=\"l\"> Adicionar 13 novos \u00edcones.\n<\/ul>\n<p>Al\u00e9m disso, pode-se mencionar <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.alertlogic.com\/alert-logic-uncovers-new-vulnerability-in-wordpress-wp-live-chat-cve-2019-11185\/\">de uma vulnerabilidade<\/a><\/noindex> uma vulnerabilidade cr\u00edtica no plugin do WordPress   <noindex><a rel=\"nofollow\" href=\"https:\/\/wp-livechat.com\/\">WP Live Chat<\/a><\/noindex> (CVE-2019-11185). A vulnerabilidade permite a execu\u00e7\u00e3o de c\u00f3digo PHP arbitr\u00e1rio no servidor. O plugin \u00e9 utilizado em mais de 27 mil sites para organizar chats interativos com visitantes, incluindo sites de empresas como IKEA, Adobe, Huawei, PayPal, Tele2 e McDonald's (Live Chat \u00e9 frequentemente usado para implementar chats pop-up inc\u00f4modos em sites de empresas oferecendo conversar com um funcion\u00e1rio).<\/p>\n<p>O problema se manifesta no c\u00f3digo de upload de arquivos para o servidor e permite contornar a verifica\u00e7\u00e3o de tipos de arquivos permitidos e fazer o upload de um script PHP no servidor, que pode ser executado diretamente atrav\u00e9s da web. Curiosamente, no ano passado, j\u00e1 havia sido identificada uma vulnerabilidade semelhante no Live Chat (CVE-2018-12426), que permitia o upload de c\u00f3digo PHP disfar\u00e7ado de imagem, especificando um tipo de conte\u00fado diferente no campo Content-type. Como parte da corre\u00e7\u00e3o do problema, verifica\u00e7\u00f5es adicionais foram adicionadas para listas brancas e tipos MIME. No entanto, essas verifica\u00e7\u00f5es estavam implementadas de forma incorreta e eram facilmente contorn\u00e1veis.<\/p>\n<p>Em particular, o upload direto de arquivos com extens\u00e3o '.php' \u00e9 proibido, mas a extens\u00e3o '.phtml' n\u00e3o foi adicionada \u00e0 lista negra, frequentemente associada ao interpretador PHP em muitos servidores. A lista branca permite apenas o upload de imagens, mas pode ser contornada especificando uma dupla extens\u00e3o, por exemplo, '.gif.phtml'. Para contornar a verifica\u00e7\u00e3o do tipo MIME no in\u00edcio do arquivo, antes da abertura da tag com o c\u00f3digo PHP, era suficiente inserir a string 'GIF89a'.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50649\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f web-\u043a\u043e\u043d\u0442\u0435\u043d\u0442\u043e\u043c WordPress 5.2. \u0412\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435\u043c \u0448\u0435\u0441\u0442\u0438\u043b\u0435\u0442\u043d\u0435\u0439 \u044d\u043f\u043e\u043f\u0435\u0438 \u043f\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0438 \u0434\u043e\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0439 \u043f\u043e \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u043f\u043e\u0434\u043f\u0438\u0441\u0438. \u0414\u043e \u0441\u0438\u0445 \u043f\u043e\u0440 \u043f\u0440\u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0432 WordPress \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u043c \u0444\u0430\u043a\u0442\u043e\u0440\u043e\u043c \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0431\u044b\u043b\u043e \u0434\u043e\u0432\u0435\u0440\u0438\u0435 \u043a \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c WordPress (\u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u043b\u0430\u0441\u044c \u0441\u0432\u0435\u0440\u043a\u0430 \u0445\u044d\u0448\u0430 \u0431\u0435\u0437 \u0432\u0435\u0440\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0430). \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-33247","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f web-\u043a\u043e\u043d\u0442\u0435\u043d\u0442\u043e\u043c WordPress.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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