{"id":181668,"date":"2026-05-23T00:25:11","date_gmt":"2026-05-22T22:25:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux"},"modified":"2026-05-23T00:25:11","modified_gmt":"2026-05-22T22:25:11","slug":"gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/gro-frag-sedmaya-uyazvimost-klassa-copy-fail-predostavlyayushhaya-prava-root-v-linux","title":{"rendered":"GRO Frag \u2014 a \u0219aptea vulnerabilitate din clasa Copy Fail, care ofer\u0103 privilegii de root \u00een Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A fost publicat un exploit pentru a \u0219aptea vulnerabilitate (1, 2-3, 4, 5, 6) din kernelul Linux, care permite unui utilizator local neprivilegiat s\u0103 ob\u021bin\u0103 drepturi de root, prin rescrierea datelor din cache-ul de pagin\u0103. Identificatorul CVE nu a fost \u00eenc\u0103 atribuit, iar informa\u021biile despre problem\u0103 sunt limitate la codul exploitului. O corectare este disponibil\u0103 doar sub form\u0103 de patch, care a fost publicat pe 20 mai \u0219i acceptat \u00een ramura principal\u0103 a kernelului Linux pe 21 mai (versiunile corective ale kernelului nu sunt \u00eenc\u0103 disponibile). <\/p>\n

Vulnerabilitatea apare \u00een implementarea tehnologiei GRO (Generic Receive Offload), utilizat\u0103 pentru accelerarea proces\u0103rii pachetelor segmentate. Vulnerabilitatea este cauzat\u0103 de o eroare \u00een realizarea mecanismului zerocopy \u00een func\u021bia skb_gro_receive(), care efectueaz\u0103 modific\u0103ri directe ale datelor \u00een cache-ul de pagin\u0103 pentru a evita tamponarea inutil\u0103. C\u00e2nd este setat indicatorul SKBFL_MANAGED_FRAG_REFS, era trecut cu vederea salvarea referin\u021bei la paginile de memorie eliberate \u00een c\u00e2mpul shinfo->frags, dup\u0103 care acest c\u00e2mp era ata\u0219at la un alt skb f\u0103r\u0103 a modifica contorul de referin\u021be, ceea ce ducea la accesarea memoriei dup\u0103 eliberare (use-after-free). Problema a fost exploatat\u0103 pentru a rescrie datele \u00een cache-ul de pagin\u0103, datorit\u0103 manipul\u0103rii pointerului la bufferul io_uring. <\/p>\n

Atacul este posibil pe sisteme cu subsistemul io_uring activat (io_uring_disabled=0). Pentru ca exploitul s\u0103 func\u021bioneze, \u00een sistem trebuie s\u0103 existe un fi\u0219ier executabil accesibil \u00een mod citire cu flagul SUID-root. Mecanismul de exploatare const\u0103 \u00een faptul c\u0103 atacatorul reu\u0219e\u0219te s\u0103 stabileasc\u0103 baza de utilizatori \u00een cache-ul de pagin\u0103, dup\u0103 care introduce \u00een cache \u0219irul «hax::0:0::\/root:\/bin\/sh». Apoi se ruleaz\u0103 comanda «su hax», care ob\u021bine nu baza de utilizatori original\u0103 de pe suport, ci o copie modificat\u0103 cu un login fals «hax», c\u0103ruia i s-au acordat drepturi de root \u0219i o parol\u0103 goal. Func\u021bionalitatea exploitului a fost testat\u0103 \u00een Ubuntu 24.04.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-181668","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\udd47GRO Frag \u2014 a \u0219asea vulnerabilitate de tip Copy Fail, care ofer\u0103 drepturi de root \u00een Linux | ProHoster","description":"A fost publicat un exploit pentru a \u0219aptea vulnerabilitate (1, 2-3, 4, 5, 6) din kernelul Linux, care permite unui utilizator local neprivilegiat s\u0103 ob\u021bin\u0103 drepturi de root, prin rescrierea datelor din cache-ul de 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