{"id":172753,"date":"2026-05-19T18:24:36","date_gmt":"2026-05-19T16:24:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-19T18:24:36","modified_gmt":"2026-05-19T16:24:36","slug":"pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/pintheft-shestaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"PinTheft \u2014 a \u0219asea vulnerabilitate din clasa Copy Fail, care ofer\u0103 drepturi de root \u00een Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Informa\u021biile despre a \u0219asea vulnerabilitate (1, 2-3, 4, 5) au fost dezv\u0103luite, permi\u021b\u00e2nd unui utilizator local f\u0103r\u0103 privilegii s\u0103 ob\u021bin\u0103 drepturi root prin rescrierea datelor \u00een cache-ul paginii. Vulnerabilitatea a primit numele de cod PinTheft. Un prototip al exploit-ului este disponibil. Identificatorul CVE nu a fost \u00eenc\u0103 atribuit. Corec\u021bia este disponibil\u0103 momentan doar sub form\u0103 de patch, care a fost publicat pe 5 mai \u0219i a fost acceptat \u00een ramura netdev pe 11 mai, dar nu a fost inclus \u00een versiunile corective ale nucleului. <\/p>\n

Vulnerabilitatea este prezent\u0103 \u00een implementarea protocolului de re\u021bea RDS (Reliable Datagram Sockets), destinat pentru schimbul rapid de mesaje \u00eentre noduri \u00eentr-un cluster, cu o \u00eent\u00e2rziere minim\u0103 \u0219i livrare garantat\u0103. Atacul este posibil pe sistemele cu subsistemul io_uring activat (io_uring_disabled=0) \u0219i nucleul compilat cu op\u021biunile CONFIG_RDS, CONFIG_RDS_TCP \u0219i CONFIG_IO_URING. Pentru ca exploit-ul s\u0103 func\u021bioneze, \u00een sistem trebuie s\u0103 existe un fi\u0219ier executabil accesibil la citire cu flag-ul SUID-root. <\/p>\n

Pentru \u00eenc\u0103rcarea automat\u0103 a modulului nucleului rds_tcp, exploit-ul solicit\u0103 trimiterea de date prin RDS utiliz\u00e2nd transportul SO_RDS_TRANSPORT=2. Este de men\u021bionat c\u0103, dintre distribu\u021biile Linux testate, modulul nucleului rds este disponibil doar \u00een Arch Linux \u00een configura\u021bia implicit\u0103. Pentru a bloca vulnerabilitatea, modulul rds \u0219i rds_tcp pot fi dezactivate astfel: rmmod rds_tcp rds printf 'install rds \/bin\/false\ninstall rds_tcp \/bin\/false\n' > \/etc\/modprobe.d\/pintheft.conf <\/p>\n

Vulnerabilitatea este cauzat\u0103 de o eroare \u00een implementarea mecanismului zerocopy \u00een func\u021bia rds_message_zcopy_from_user(), care efectueaz\u0103 modific\u0103ri directe ale datelor \u00een cache-ul paginilor pentru a evita un exces de buffer. \u00cen cazul unei erori, c\u00e2mpul rm->data.op_nents nu a fost cur\u0103\u021bat, rezult\u00e2nd \u00een eliberarea dubl\u0103 a buffer-ului (double-free). Apari\u021bia unei valori incorecte \u00een contorul de referin\u021be a putut fi exploatat\u0103 pentru a rescrie datele din cache-ul paginilor, datorit\u0103 manipul\u0103rii pointerului c\u0103tre un buffer fix io_uring. <\/p>\n

\u00cen rest, mecanismul de exploatare este tipic pentru toate vulnerabilit\u0103\u021bile din aceast\u0103 clas\u0103 \u2014 atacatorul reu\u0219e\u0219te s\u0103 plaseze un fi\u0219ier de program cu flag-ul suid root \u00een cache-ul paginilor, dup\u0103 care injecteaz\u0103 \u00een antetul ELF codul pentru a lansa \/usr\/bin\/sh. Dup\u0103 aceast\u0103 manipulare, lansarea programului duce la \u00eenc\u0103rcarea \u00een memorie a unei copii modificate a fi\u0219ierului executabil din cache-ul paginilor, nu a originalului de pe suport. Spre deosebire de exploit-urile anterioare, noua variant\u0103 este adaptat\u0103 doar pentru a ataca utilitarul \u201esu\u201d, dar poate fi aplicat\u0103 \u00een prezen\u021ba unor astfel de programe suid \u00een sistem, cum ar fi mount, passwd, chsh, newgrp, umount \u0219i pkexec.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u0448\u0435\u0441\u0442\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (1, 2-3, 4, 5), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0430\u0432\u0430 root, \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u0434\u0430\u043d\u043d\u044b\u0435 \u0432 \u0441\u0442\u0440\u0430\u043d\u0438\u0447\u043d\u043e\u043c \u043a\u044d\u0448\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0435 \u0438\u043c\u044f PinTheft. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u0430. CVE-\u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440 \u0435\u0449\u0451 \u043d\u0435 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043a\u0430 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0432\u0438\u0434\u0435 \u043f\u0430\u0442\u0447\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d 5 \u043c\u0430\u044f \u0438 11 \u043c\u0430\u044f \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442\u0432 \u0432\u0435\u0442\u043a\u0443 netdev, \u043d\u043e \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0451\u043d \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-172753","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\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\udd47PinTheft \u2014 a \u0219asea vulnerabilitate din clasa Copy Fail, care ofer\u0103 drepturi root \u00een Linux | ProHoster","description":"A fost dezv\u0103luit\u0103 informa\u021bia despre a \u0219asea vulnerabilitate (1, 2-3, 4, 5), care permite unui utilizator local f\u0103r\u0103 privilegii s\u0103 ob\u021bin\u0103 drepturi root, suprascriind datele \u00een cache-ul 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