I standardbiblioteket f\u00f6r Rust-spr\u00e5ket har en s\u00e5rbarhet uppt\u00e4ckts (CVE-2022-21658) kopplad till en kappl\u00f6pning i funktionen std::fs::remove_dir_all(). Vid anv\u00e4ndning av denna funktion f\u00f6r att ta bort tillf\u00e4lliga filer i en privilegierad applikation kan en angripare uppn\u00e5 borttagning av godtyckliga systemfiler och kataloger som normalt inte g\u00e5r att n\u00e5 f\u00f6r angriparen. <\/p>\n
S\u00e5rbarheten orsakas av en felaktig implementering av kontroll av symboliska l\u00e4nkar innan kataloger tas bort rekursivt. Ist\u00e4llet f\u00f6r att f\u00f6rbjuda f\u00f6ljande av symboliska l\u00e4nkar, kontrollerar funktionen remove_dir_all() f\u00f6rst om filen \u00e4r en symbolisk l\u00e4nk. Om l\u00e4nken \u00e4r definierad tas den bort som en fil, och om det \u00e4r en katalog, inleds en rekursiv borttagningsoperation av inneh\u00e5llet. Problemet \u00e4r att det finns en liten f\u00f6rdr\u00f6jning mellan kontrollen och b\u00f6rjan av borttagningsoperationen. <\/p>\n
I det \u00f6gonblick kontrollen redan har genomf\u00f6rts, men kataloggenomg\u00e5ngen f\u00f6r borttagning \u00e4nnu inte har p\u00e5b\u00f6rjats, kan angriparen byta ut katalogen med tillf\u00e4lliga filer mot en symbolisk l\u00e4nk. Om detta g\u00f6rs vid r\u00e4tt tidpunkt kommer funktionen remove_dir_all() att behandla den symboliska l\u00e4nken som en katalog och b\u00f6rja ta bort det inneh\u00e5ll som l\u00e4nken pekar p\u00e5. Trots att framg\u00e5ngen med attacken beror p\u00e5 noggrannhet i tidpunkten f\u00f6r katalogbyte och chansen att tr\u00e4ffa r\u00e4tt vid f\u00f6rsta f\u00f6rs\u00f6ket \u00e4r liten, har forskarna lyckats uppn\u00e5 ett upprepade g\u00e5nger framg\u00e5ngsrikt genomf\u00f6rande av attacken efter att ha k\u00f6rt exploiten under n\u00e5gra sekunder. <\/p>\n
Alla versioner av Rust fr\u00e5n 1.0.0 till och med 1.58.0 \u00e4r mottagliga f\u00f6r denna s\u00e5rbarhet. Problemet har \u00e4n s\u00e5 l\u00e4nge \u00e5tg\u00e4rdats i form av en patch (fixen kommer att ing\u00e5 i version 1.58.1, som f\u00f6rv\u00e4ntas sl\u00e4ppas inom n\u00e5gra timmar). F\u00f6r att f\u00f6lja upp p\u00e5 hanteringen av s\u00e5rbarheten i distributioner kan man kolla p\u00e5 dessa sidor: Debian, RHEL, SUSE, Fedora, Ubuntu, Arch, FreeBSD. Alla anv\u00e4ndare av program skrivna i Rust, som k\u00f6rs med h\u00f6ga privilegier och anv\u00e4nder funktionen remove_dir_all, rekommenderas att omg\u00e5ende uppdatera Rust till version 1.58.1. Intressant nog l\u00f6ser den utgivna patchen inte problemet p\u00e5 alla system; till exempel, i REDOX-operativsystemet och versioner av macOS f\u00f6re 10.10 (Yosemite) blockeras s\u00e5rbarheten inte p\u00e5 grund av avsaknaden av O_NOFOLLOW-flaggan, som inaktiverar f\u00f6ljande av symboliska l\u00e4nkar. \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 \u0434\u0430\u043d\u043d\u043e\u0439 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[…]<\/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-103040","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47S\u00e5rbarhet i standardbiblioteket f\u00f6r programmeringsspr\u00e5ket Rust | ProHoster","description":"En standardbibliotek f\u00f6r programmeringsspr\u00e5kets Rust har en s\u00e5rbarhet identifierats (CVE-2022-21658) relaterad till ett t\u00e4vlingsvillkor i funktionen 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\u044f\u0437\u044b\u043a\u0430 Rust | ProHoster","og:description":"\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 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K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"