Uma vulnerabilidade foi identificada na biblioteca padr\u00e3o da linguagem Rust (CVE-2022-21658), relacionada a uma condi\u00e7\u00e3o de corrida na fun\u00e7\u00e3o std::fs::remove_dir_all(). Ao utilizar essa fun\u00e7\u00e3o para remover arquivos tempor\u00e1rios em um aplicativo privilegiado, um invasor pode conseguir deletar arquivos e diret\u00f3rios do sistema aleat\u00f3rios, aos quais normalmente ele n\u00e3o teria acesso. <\/p>\n
A vulnerabilidade \u00e9 causada por uma implementa\u00e7\u00e3o inadequada da verifica\u00e7\u00e3o de links simb\u00f3licos antes da exclus\u00e3o recursiva de diret\u00f3rios. Em vez de proibir a navega\u00e7\u00e3o por links simb\u00f3licos, a fun\u00e7\u00e3o remove_dir_all() inicialmente verifica se o arquivo \u00e9 um link simb\u00f3lico. Se um link for identificado, ele \u00e9 removido como um arquivo, e se for um diret\u00f3rio, a opera\u00e7\u00e3o de exclus\u00e3o recursiva do conte\u00fado \u00e9 chamada. O problema \u00e9 que h\u00e1 um pequeno atraso entre a verifica\u00e7\u00e3o e o in\u00edcio da opera\u00e7\u00e3o de exclus\u00e3o. <\/p>\n
No momento em que a verifica\u00e7\u00e3o j\u00e1 foi realizada, mas a opera\u00e7\u00e3o de itera\u00e7\u00e3o nos diret\u00f3rios para remo\u00e7\u00e3o ainda n\u00e3o come\u00e7ou, um invasor pode substituir o diret\u00f3rio com arquivos tempor\u00e1rios por um link simb\u00f3lico. Se isso ocorrer no momento certo, a fun\u00e7\u00e3o remove_dir_all() tratar\u00e1 o link simb\u00f3lico como um diret\u00f3rio e come\u00e7ar\u00e1 a remover o conte\u00fado apontado por esse link. Embora o sucesso do ataque dependa da precis\u00e3o do tempo escolhido para a substitui\u00e7\u00e3o do diret\u00f3rio, e a chance de conseguir isso na primeira tentativa seja baixa, os pesquisadores conseguiram realizar com sucesso o ataque muitas vezes ap\u00f3s a execu\u00e7\u00e3o do exploit em poucos segundos. <\/p>\n
Todas as vers\u00f5es do Rust da 1.0.0 at\u00e9 a 1.58.0 inclusivas est\u00e3o vulner\u00e1veis. O problema j\u00e1 foi corrigido na forma de um patch (a corre\u00e7\u00e3o ser\u00e1 inclu\u00edda na vers\u00e3o 1.58.1, que \u00e9 esperada nas pr\u00f3ximas horas). \u00c9 poss\u00edvel acompanhar a corre\u00e7\u00e3o nas distribui\u00e7\u00f5es nas seguintes p\u00e1ginas: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch, FreeBSD. A todos os usu\u00e1rios de programas na linguagem Rust, executados com privil\u00e9gios elevados e que utilizam a fun\u00e7\u00e3o remove_dir_all, recomenda-se que atualizem imediatamente para a vers\u00e3o 1.58.1. Curiosamente, o patch lan\u00e7ado n\u00e3o resolve o problema em todos os sistemas; por exemplo, no sistema operacional REDOX e nas vers\u00f5es do macOS anteriores \u00e0 10.10 (Yosemite), a vulnerabilidade n\u00e3o \u00e9 bloqueada devido \u00e0 aus\u00eancia da flag O_NOFOLLOW, que desativa o seguimento de links simb\u00f3licos. \u0412 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 \u044f\u0437\u044b\u043a\u0430 Rust \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-21658), \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 std::fs::remove_dir_all(). \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"