{"id":100599,"date":"2021-06-25T16:22:49","date_gmt":"2021-06-25T14:22:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux"},"modified":"2021-06-25T16:22:49","modified_gmt":"2021-06-25T14:22:49","slug":"uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/uyazvimost-v-ebpf-pozvolyayushhaya-vypolnit-kod-na-urovne-yadra-linux","title":{"rendered":"Kwetsbaarheid in eBPF, waarmee code op het niveau van de Linux-kernel kan worden uitgevoerd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In het eBPF-systeem, dat het mogelijk maakt om handlers binnen de Linux-kernel uit te voeren in een speciale virtuele machine met JIT, is er een kwetsbaarheid ontdekt (CVE-2021-3600) die een lokale ongeprivilegieerde gebruiker in staat stelt om zijn code op kernel-niveau uit te voeren. Het probleem wordt veroorzaakt door een onjuiste afkorting van 32-bits registers tijdens de uitvoering van 'div' en 'mod' operaties, wat kan leiden tot het lezen en schrijven van gegevens buiten het toegewezen geheugengebied. <\/p>\n

De kwetsbaarheid is opgenomen in een onjuiste correctie voor 32-bit deling door nul in uitgave 4.15, die ook is gebackporteerd naar de takken 4.4.x, 4.9.x en 4.14.x. Exploitatie van de kwetsbaarheid is mogelijk voor kernels vanaf versie 4.14, waarin de methode voor het volgen van waarden in de BPF-verifier is gewijzigd. Het probleem is opgelost in de Linux-kernel 5.11. De correctie is gebackporteerd naar de takken 5.10.x en 5.4.x, maar is niet overgezet naar de takken 4.19.x en 4.14.x. Een update met de correctie van de kwetsbaarheid is vrijgegeven voor Ubuntu en Debian Sid. Of het probleem zich manifesteert in SUSE en RHEL is nog niet duidelijk.
\n
Bron: opennet.ru<\/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":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100599","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\udd47Kwetsbaarheid in eBPF, waarmee code op het niveau van de Linux-kernel kan worden uitgevoerd | ProHoster","description":"In de eBPF-subsysteem, dat het mogelijk maakt om handlers uit te voeren binnen de Linux-kernel in een speciale virtuele machine met JIT, is een kwetsbaarheid (CVE-2021-3600) ontdekt die een niet-privileged lokale gebruiker in staat stelt om zijn code uit te 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