{"id":183295,"date":"2026-09-08T22:53:24","date_gmt":"2026-09-08T20:53:24","guid":{"rendered":"https:\/\/prohoster.info\/blog\/news\/uyazvimost-v-os-qubes-pozvolyayushhaya-obojti-izolyacziyu-i-vypolnit-kod-na-urovne-dom0"},"modified":"2026-09-08T22:53:29","modified_gmt":"2026-09-08T20:53:29","slug":"qubes-os-vulnerability-allows-isolation-bypass-and-code-execution-in-dom0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/qubes-os-vulnerability-allows-isolation-bypass-and-code-execution-in-dom0","title":{"rendered":"S\u00e5rbarhed i Qubes OS, der g\u00f8r det muligt at omg\u00e5 isolation og udf\u00f8re kode p\u00e5 Dom0-niveau","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Der er offentliggjort oplysninger om en s\u00e5rbarhed i Qubes operativsystemet, som bruger en hypervisor til striks isolering af applikationer og OS-komponenter (hver applikationsklasse og systemtjenester k\u00f8rer i separate virtuelle maskiner). Hvis en angriber kompromitterer en af de virtuelle maskiner, muligg\u00f8r s\u00e5rbarheden omg\u00e5else af isolation, udf\u00f8relse af vilk\u00e5rlige kommandoer p\u00e5 v\u00e6rtsmilj\u00f8et (Dom0) og overtagelse af hele operativsystemet. Problemet opst\u00e5r, n\u00e5r brugeren anvender v\u00e6rkt\u00f8jet «qvm-copy-to-vm» til at kopiere en fil fra v\u00e6rtsmilj\u00f8et til en virtuel maskine, der kontrolleres af angriberen. S\u00e5rbarheden er blevet l\u00f8st i opdateringen af pakke qubes-core-dom0-linux 4.3.22. <\/p>\n

Problemet findes i v\u00e6rkt\u00f8jet «qvm-copy-to-vm» og skyldes forkert h\u00e5ndtering af fejl, der returneres ved tilgang til virtuelle maskiner<\/a>. Essensen af s\u00e5rbarheden er, at v\u00e6rkt\u00f8jet qvm-copy-to-vm for at vise fejlmeddelelser k\u00f8rer programmerne kdialog eller zenity ved hj\u00e6lp af funktionen system() og inds\u00e6tter oplysninger om den mislykkedes kopi i kommandolinjens indstillinger. Rensningen af filnavnet er begr\u00e6nset til at fjerne ikke-ASCII-tegn og dobbelte citationstegn uden at kontrollere for tilstedev\u00e6relsen af specialtegn, der fortolkes af kommandoskallen, s\u00e5som «`» og «$». <\/p>\n

Efter afslutningen af filkopieringen fra v\u00e6rtsystemet sender behandleren p\u00e5 den virtuelle maskine en bekr\u00e6ftelse tilbage, som blandt andet angiver navnet p\u00e5 den senest modtagne fil. Angrebet g\u00e5r ud p\u00e5 at returnere en fejlmeddelelse i stedet for bekr\u00e6ftelsen og angive for en fil, der ikke kunne kopieres, et navn med specialtegn, der behandles af kommandotolk. Efter modtagelsen af fejlen vil behandleren p\u00e5 v\u00e6rtsmilj\u00f8et k\u00f8re v\u00e6rkt\u00f8jet til visning af en dialog med fejlmeddelelsen ved at inds\u00e6tte det returnerede navn p\u00e5 filen (for eksempel ved angivelse af «file`id`» vil kommandoen id blive udf\u00f8rt p\u00e5 v\u00e6rtsmilj\u00f8et).
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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