{"id":37292,"date":"2019-10-31T22:16:49","date_gmt":"2019-10-31T19:16:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root\/"},"modified":"2019-10-31T22:16:49","modified_gmt":"2019-10-31T19:16:49","slug":"v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-webmin-najden-bekdor-pozvolyayushhij-udalyonno-poluchit-dostup-s-pravami-root","title":{"rendered":"Foi encontrado um backdoor no Webmin, que permite o acesso remoto com privil\u00e9gios de root","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No pacote Webmin<\/a><\/noindex>, que fornece ferramentas para gerenciar o servidor remotamente, foi identificado<\/a><\/noindex> um backdoor (CVE-2019-15107<\/a><\/noindex>), detectado nas compila\u00e7\u00f5es oficiais do projeto, distribu\u00eddas<\/a><\/noindex> atrav\u00e9s do Sourceforge e recomendadas<\/a><\/noindex> no site principal. O backdoor esteve presente em compila\u00e7\u00f5es de 1.882 at\u00e9 1.921, inclusive (no reposit\u00f3rio git, o c\u00f3digo com o backdoor est\u00e1 ausente) e permitia a execu\u00e7\u00e3o remota de comandos shell arbitr\u00e1rios no sistema com privil\u00e9gios de root, sem autentica\u00e7\u00e3o. <\/p>\n

Para a ataque, \u00e9 suficiente ter uma porta de rede aberta com Webmin e atividade na interface web da fun\u00e7\u00e3o de troca de senha antiga (ativada por padr\u00e3o nas compila\u00e7\u00f5es 1.890, mas desativada nas demais vers\u00f5es). O problema no lan\u00e7amento<\/a><\/noindex> em atualiza\u00e7\u00e3o<\/a><\/noindex> 1.930. Como uma medida tempor\u00e1ria para bloquear o backdoor, \u00e9 suficiente remover a configura\u00e7\u00e3o «passwd_mode=» do arquivo de configura\u00e7\u00e3o \/etc\/webmin\/miniserv.conf. Para testes, foi preparado um prot\u00f3tipo de exploit<\/a><\/noindex>.<\/p>\n

O problema foi detectado<\/a><\/noindex> no script password_change.cgi, que verifica a senha antiga inserida no formul\u00e1rio web \u00e9 utilizado<\/a><\/noindex> usando a fun\u00e7\u00e3o unix_crypt, a qual recebe a senha fornecida pelo usu\u00e1rio sem realizar a sanitiza\u00e7\u00e3o de caracteres especiais. No reposit\u00f3rio git, essa fun\u00e7\u00e3o \u00e9<\/a><\/noindex> uma camada sobre o m\u00f3dulo Crypt::UnixCrypt e n\u00e3o representa perigo, mas no arquivo de c\u00f3digo fornecido no site Sourceforge, um c\u00f3digo \u00e9 chamado que acessa diretamente \/etc\/shadow, mas faz isso atrav\u00e9s de uma constru\u00e7\u00e3o de shell. Para a ataque, basta inserir o s\u00edmbolo «|» no campo da senha antiga e o c\u00f3digo seguinte ser\u00e1 executado com privil\u00e9gios de root no servidor.<\/p>\n

De acordo com a declara\u00e7\u00e3o<\/a><\/noindex> Os desenvolvedores do Webmin, o c\u00f3digo malicioso foi inserido devido \u00e0 comprometimento da infraestrutura do projeto. Os detalhes ainda n\u00e3o foram divulgados, portanto n\u00e3o est\u00e1 claro se a invas\u00e3o foi limitada ao controle da conta no Sourceforge ou afetou outros elementos da infraestrutura de desenvolvimento e constru\u00e7\u00e3o do Webmin. O c\u00f3digo malicioso esteve presente nos arquivos desde mar\u00e7o de 2018. O problema tamb\u00e9m afetou as compila\u00e7\u00f5es do Usermin<\/a><\/noindex>. Atualmente, todos os arquivos de instala\u00e7\u00e3o foram reconstru\u00eddos a partir do Git.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0430\u043a\u0435\u0442\u0435 Webmin, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c, \u0432\u044b\u044f\u0432\u043b\u0435\u043d \u0431\u044d\u043a\u0434\u043e\u0440 (CVE-2019-15107), \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0439 \u0432 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0445 \u0447\u0435\u0440\u0435\u0437 Sourceforge \u0438 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 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