{"id":170544,"date":"2026-05-09T12:24:31","date_gmt":"2026-05-09T10:24:32","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-sistemnom-vyzove-execve-predostavlyayushhaya-root-dostup-vo-freebsd"},"modified":"2026-05-09T12:24:31","modified_gmt":"2026-05-09T10:24:32","slug":"uyazvimost-v-sistemnom-vyzove-execve-predostavlyayushhaya-root-dostup-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-sistemnom-vyzove-execve-predostavlyayushhaya-root-dostup-vo-freebsd","title":{"rendered":"A FreeBSD execve rendszerh\u00edv\u00e1s\u00e1ban l\u00e9v\u0151 sebezhet\u0151s\u00e9g root-hozz\u00e1f\u00e9r\u00e9st biztos\u00edt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A FreeBSD-ben felfedeztek egy sebezhet\u0151s\u00e9get (CVE-2026-7270), amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3 k\u00f3dot futtasson a kernel jogk\u00f6r\u00e9vel, \u00e9s root hozz\u00e1f\u00e9r\u00e9st szerezzen a rendszerhez. A sebezhet\u0151s\u00e9g minden FreeBSD kiad\u00e1st \u00e9rint, amely 2013 \u00f3ta k\u00e9sz\u00fclt. Az interneten el\u00e9rhet\u0151 egy exploit, amelynek m\u0171k\u00f6d\u00e9s\u00e9t a FreeBSD 11.0 \u00e9s 14.4 k\u00f6z\u00f6tti rendszereken igazolt\u00e1k. A sebezhet\u0151s\u00e9get a FreeBSD 15.0-RELEASE-p7, 14.4-RELEASE-p3, 14.3-RELEASE-p12 \u00e9s 13.5-RELEASE-p13 friss\u00edt\u00e9sek jav\u00edtott\u00e1k. R\u00e9gebbi \u00e1gak eset\u00e9ben patch haszn\u00e1lhat\u00f3.      <\/p>\n<p>A probl\u00e9ma a buffert\u00falcs\u00fars miatt k\u00f6vetkezik be az execve rendszerh\u00edv\u00e1s sor\u00e1n, amely akkor t\u00f6rt\u00e9nik, amikor a script els\u0151 sor\u00e1ban a v\u00e9grehajt\u00f3hoz vezet\u0151 \u00fatvonalat megad\u00f3 prefixet kezelj\u00fck (p\u00e9ld\u00e1ul: #!\/bin\/sh). A t\u00falt\u00f6lt\u00e9s a memmove f\u00fcggv\u00e9ny h\u00edv\u00e1sakor jelentkezik, mivel a m\u00e1soland\u00f3 argumentumok m\u00e9ret\u00e9nek kisz\u00e1m\u00edt\u00e1sa helytelen matematikai kifejez\u00e9ssel t\u00f6rt\u00e9nik. Ahelyett, hogy az 'args-&gt;endp' \u00e9rt\u00e9k\u00e9b\u0151l levonn\u00e1nk az 'args-&gt;begin_argv' \u00e9s 'consume' \u00e9rt\u00e9keket, csak 'args-&gt;begin_argv' \u00e9rt\u00e9k\u00e9t vont\u00e1k le, m\u00edg a 'consume' v\u00e1ltoz\u00f3 hozz\u00e1ad\u00e1sra ker\u00fclt az eredm\u00e9nyhez, teh\u00e1t a m\u00e1solt adatok mennyis\u00e9ge k\u00e9t 'consume' \u00e9rt\u00e9kkel t\u00f6bb lett.  \tmemmove(args-&gt;begin_argv + extend, args-&gt;begin_argv + consume,  &#8212;  args-&gt;endp &#8212; args-&gt;begin_argv + consume);  +    args-&gt;endp &#8212; (args-&gt;begin_argv + consume));         <\/p>\n<p>A t\u00falt\u00f6lt\u00e9s lehet\u0151v\u00e9 teszi, hogy fel\u00fcl\u00edrjuk a szomsz\u00e9dos mem\u00f3ria ter\u00fcleten tal\u00e1lhat\u00f3 'exec_map' strukt\u00fara elemeit egy m\u00e1sik folyamatb\u00f3l. Az exploitban a t\u00falt\u00f6lt\u00e9st arra haszn\u00e1lj\u00e1k, hogy fel\u00fcl\u00edrj\u00e1k az 'exec_map' tartalm\u00e1t a rendszerben id\u0151szakosan fut\u00f3 privilegiz\u00e1lt folyamatok \u00e1ltal. Ilyen folyamatk\u00e9nt az sshd van kiv\u00e1lasztva, amely minden h\u00e1l\u00f3zati kapcsolat l\u00e9trehoz\u00e1sakor fork \u00e9s execve h\u00edv\u00e1ssal egy 'usr\/libexec\/sshd-session' nev\u0171 folyamatot ind\u00edt root jogokkal.     <\/p>\n<p>Az exploit az adott folyamat sz\u00e1m\u00e1ra be\u00e1ll\u00edtja a 'LD_PRELOAD=\/tmp\/evil.so' k\u00f6rnyezeti v\u00e1ltoz\u00f3t, amely a bibliot\u00e9ka bet\u00f6lt\u00e9s\u00e9hez vezet az sshd-session kontextus\u00e1ban. A bet\u00f6lt\u00f6tt k\u00f6nyvt\u00e1r l\u00e9trehozza a f\u00e1jlrendszerben a \/tmp\/rootsh v\u00e9grehajthat\u00f3 f\u00e1jlt root suid z\u00e1szl\u00f3val. A sikeres t\u00falt\u00f6lt\u00e9s val\u00f3sz\u00edn\u0171s\u00e9ge 0,6%, de a ciklikus k\u00eds\u00e9rletez\u00e9snek k\u00f6sz\u00f6nhet\u0151en a sikeres exploit k\u00f6r\u00fclbel\u00fcl 6 m\u00e1sodpercen bel\u00fcl el\u00e9rhet\u0151 egy 4-mag\u00fa CPU-val rendelkez\u0151 rendszerben.      <center><img decoding=\"async\" alt=\"A FreeBSD execve rendszerh\u00edv\u00e1s\u00e1ban l\u00e9v\u0151 sebezhet\u0151s\u00e9g root-hozz\u00e1f\u00e9r\u00e9st biztos\u00edt\" src=\"\/wp-content\/uploads\/2026\/05\/6d8779e37e52d9af205b881f8e8a065c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Ezen k\u00edv\u00fcl a FreeBSD-ben m\u00e9g t\u00f6bb sebezhet\u0151s\u00e9get is kijav\u00edtottak:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2026-35547, CVE-2026-39457 \u2014 puffer t\u00falcsordul\u00e1sok a libnv k\u00f6nyvt\u00e1rban, amelyet a kernel \u00e9s az alapvet\u0151 rendszert haszn\u00e1l\u00f3 alkalmaz\u00e1sok haszn\u00e1lnak kulcs\/\u00e9rt\u00e9k form\u00e1tum\u00fa list\u00e1k feldolgoz\u00e1s\u00e1ra \u00e9s az adatok \u00e1tad\u00e1s\u00e1nak megszervez\u00e9s\u00e9re az interprocessz\u00e1lis kommunik\u00e1ci\u00f3 sor\u00e1n. Az els\u0151 probl\u00e9ma a m\u00e9ret helytelen kisz\u00e1m\u00edt\u00e1s\u00e1b\u00f3l ad\u00f3dik, amikor speci\u00e1lisan form\u00e1zott IPC \u00fczenetek fejl\u00e9c\u00e9t dolgozz\u00e1k fel. A m\u00e1sodik probl\u00e9ma a verem t\u00falt\u00f6lt\u00e9s\u00e9t okozza az adatok socket-en t\u00f6rt\u00e9n\u0151 megoszt\u00e1sakor, mivel nincs ellen\u0151rz\u00e9s a socket le\u00edr\u00f3j\u00e1nak m\u00e9rete \u00e9s a select() funkci\u00f3ban haszn\u00e1lt puffer m\u00e9rete k\u00f6z\u00f6tt. Ezek a sebezhet\u0151s\u00e9gek potenci\u00e1lisan felhaszn\u00e1lhat\u00f3k a rendszerben val\u00f3 jogosults\u00e1gok megszerz\u00e9s\u00e9re.\n<li class=\"l\"> CVE-2026-42512 \u2014 t\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 puffer t\u00falcsordul\u00e1s a dhclient-ben, amely a k\u00f6rnyezeti v\u00e1ltoz\u00f3k dhclient-script-be val\u00f3 tov\u00e1bb\u00edt\u00e1s\u00e1hoz haszn\u00e1lt mutat\u00f3 t\u00f6mb m\u00e9ret\u00e9nek helytelen kisz\u00e1m\u00edt\u00e1s\u00e1b\u00f3l ad\u00f3dik. Nem z\u00e1rhat\u00f3 ki a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1sra alkalmas exploit l\u00e9trehoz\u00e1sa speci\u00e1lisan form\u00e1zott DHCP-csomag k\u00fcld\u00e9s\u00e9vel.\n<li class=\"l\"> CVE-2026-7164 \u2014 verem t\u00falcsordul\u00e1s a pf csomagsz\u0171r\u0151ben, amely speci\u00e1lisan form\u00e1zott SCTP csomagok feldolgoz\u00e1sa sor\u00e1n fordul el\u0151. A probl\u00e9ma a SCTP param\u00e9terek korl\u00e1tlan rekurz\u00edv elemz\u00e9s\u00e9b\u0151l fakad.\n<li class=\"l\"> CVE-2026-42511 \u2014 lehet\u0151s\u00e9g tetsz\u0151leges direkt\u00edv\u00e1k behelyettes\u00edt\u00e9s\u00e9re a dhclient.conf f\u00e1jlban a BOOTP mez\u0151kben, amelyek k\u00fcls\u0151 DHCP-szervert\u0151l sz\u00e1rmaznak, a dupla z\u00e1r\u00f3jelek megfelel\u0151 escape-\u00f6l\u00e9s\u00e9nek hi\u00e1nya miatt. A dhclient \u00e1ltal v\u00e9gzett f\u00e1jl elemz\u00e9se sor\u00e1n a t\u00e1mad\u00f3 \u00e1ltal megadott mez\u0151 \u00e1tad\u00e1sra ker\u00fcl a dhclient-script-nek, ami arra haszn\u00e1lhat\u00f3 fel, hogy tetsz\u0151leges parancsokat hajtsanak v\u00e9gre root jogosults\u00e1gokkal a dhclient-et haszn\u00e1l\u00f3 rendszereken, amikor a t\u00e1mad\u00f3 \u00e1ltal ellen\u0151rz\u00f6tt DHCP-szerverhez fordulnak.\n<li class=\"l\"> CVE-2026-6386 \u2014 a nagy mem\u00f3riaoldalak megfelel\u0151 kezel\u00e9s\u00e9nek hi\u00e1nya a pmap_pkru_update_range() kernel funkci\u00f3n bel\u00fcl. Egy nem privil\u00e9giz\u00e1lt felhaszn\u00e1l\u00f3 arra k\u00e9nyszer\u00edtheti a pmap_pkru_update_range()-t, hogy a felhaszn\u00e1l\u00f3i t\u00e9rb\u0151l sz\u00e1rmaz\u00f3 mem\u00f3ri\u00e1t mem\u00f3riaoldalnak kezelje az oldal t\u00e1bl\u00e1zat\u00e1ban, \u00e9s hozz\u00e1f\u00e9rhetetlen mem\u00f3riater\u00fclet fel\u00fcl\u00edr\u00e1s\u00e1t \u00e9rheti el.\n<li class=\"l\"> CVE-2026-5398 \u2014 m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fcletekhez val\u00f3 hozz\u00e1f\u00e9r\u00e9s a TIOCNOTTY kezel\u0151ben, amely lehet\u0151v\u00e9 teszi a nem privil\u00e9giz\u00e1lt folyamat sz\u00e1m\u00e1ra, hogy root jogosults\u00e1got szerezzen.        <\/ul>\n<p>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65408\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-7270), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c root-\u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0432\u0441\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\u0438 FreeBSD, \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u0441 2013 \u0433\u043e\u0434\u0430. \u0412 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u0434\u043e\u0441\u0442\u0443\u043f\u0435 \u0440\u0430\u0437\u043c\u0435\u0449\u0451\u043d \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442, \u0440\u0430\u0431\u043e\u0442\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u0435\u043d\u0430 \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 FreeBSD 11.0 \u043f\u043e 14.4. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 FreeBSD 15.0-RELEASE-p7, 14.4-RELEASE-p3, 14.3-RELEASE-p12 \u0438 13.5-RELEASE-p13. \u0414\u043b\u044f \u0431\u043e\u043b\u0435\u0435 \u0441\u0442\u0430\u0440\u044b\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":170545,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-170544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-7270), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c 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