{"id":162791,"date":"2026-02-25T17:11:54","date_gmt":"2026-02-25T15:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme"},"modified":"2026-02-25T17:11:54","modified_gmt":"2026-02-25T15:11:54","slug":"seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/seriya-novyh-uyazvimostej-v-telnetd-pozvolyayushhih-poluchit-root-privilegii-v-sisteme","title":{"rendered":"Uus haavatavuste seeria telnetd-s, mis v\u00f5imaldab s\u00fcsteemis saada root-privileegid","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Jaanuaris tuvastatud haavatavusest, mis v\u00f5imaldas root-kasutajana sisse logida parooli kontrollimata, on GNU InetUtilsi telnetd serveris leitud mitu viisi privileegide t\u00f5stmiseks, mis tulenesid haavatavuse mittet\u00e4ielikust k\u00f5rvaldamisest 1999. aastal (CVE-1999-0073). <\/p>\n

Haavatavused on p\u00f5hjustatud telnetd-s klientide poolt serverisse keskkonnamuutujate edastamise v\u00f5imalusest ENVIRON valikuga. Sellised keskkonnamuutujad seadistatakse ja t\u00f6\u00f6deldakse telnetd protsessi kontekstis ning edastatakse tema k\u00e4ivitatud alamprotsessidele, sealhulgas rooti \u00f5igustes k\u00e4ivitatavale protsessile \/bin\/login. CVE-1999-0073 haavatavus v\u00f5imaldas telnet-kliendil edastada keskkonnamuutuja LD_LIBRARY_PATH, mis m\u00e4\u00e4rab kasutaja poolt antud jagatud teegi laadimise login protsessi k\u00e4ivitamisel. Kui r\u00fcndajal on v\u00f5imalus failide laadimiseks s\u00fcsteemi, mis toetab telnet-protokolli, suudab ta laadida spetsiaalselt kujundatud teegi ja korraldada selle laadimise root \u00f5igustes. <\/p>\n

GNU InetUtils paketti telnetd-s on viga, mis on likvideeritud ohtlike keskkonnamuutujate keelamise kaudu, filtreerides maskide j\u00e4rgi \"LD_\", \"LIBPATH\", \"ENV\", \"IFS\" ja \"_RLD_\". Keelamata j\u00e4i keskkonnamuutuja \"CREDENTIALS_DIRECTORY\", mida t\u00f6\u00f6deldakse k\u00e4ivitamisel \/usr\/bin\/login. Selle keskkonnamuutujaga sai kasutaja muuta akrediteerimisfailide katalooge ning paigutada uude katalooge faili login.noauth v\u00e4\u00e4rtusega \"yes\", mis aktiveerib sisselogimise ilma paroolita (sarnane protsessi login jaoks lipu \"-f\" edastamisega). Seade kehtib k\u00f5igi kasutajate, sealhulgas rooti jaoks. <\/p>\n

R\u00fcnnak seisneb madalama privileegiga kasutaja alamkatalooge loomises oma kodukataloogis, faili login.noauth sinna \u00fcleslaadimises ja sisselogimise katsetamises, seadistades keskkonnamuutuja \"CREDENTIALS_DIRECTORY=loodud kataloog\" ja edastades keskkonnamuutuja \"USER=root\" (telnetis on automaatse \u00fchenduse re\u017eiim, kus kasutajanimi ei v\u00f5eta k\u00e4surealt, vaid edastatakse keskkonnamuutujas USER). N\u00e4ide eksploitist. <\/p>\n

Leiti oli tuvastatud veel \u00fcks meetod, kuidas saada root-juurdep\u00e4\u00e4s telnetd kaudu, mis on seotud GNU gettext'i raamatukogus t\u00f6\u00f6deldud keskkonnaparameetrite OUTPUT_CHARSET ja LANGUAGE manipuleerimisega ning glibc-s kasutatava keskkonnaparameetriga GCONV_PATH. Asetades keskkonnaparameetrid OUTPUT_CHARSET ja LANGUAGE, saab r\u00fcndaja aktiveerida gettext'i funktsionaalsuse, mis muundab s\u00fcmbolite kodeeringut, kutsudes esile funktsiooni iconv_open(). Omakorda, k\u00e4ivitades funktsiooni iconv_open() gconv-modules konfiguratsioonifaili laadimise ajal, arvutatakse tee, arvestades keskkonnaparameetrit GCONV_PATH. Gconv-modules faili asendamine v\u00f5imaldab laadida kohandatud jagatud teeki lokaliseeritud stringi v\u00e4ljundis login protsessi ajal. <\/p>\n

CVE-id m\u00e4\u00e4ratud haavatavustele ei ole veel antud. Kaitsemeetodina kaalutakse lubatud v\u00e4\u00e4rtuste valge nimekirja kasutuselev\u00f5ttu (\"TERM\", \"DISPLAY\", \"USER\", \"LOGNAME\" ja \"POSIXLY_CORRECT\"), blokeerides k\u00f5ik muud keskkonnamuutujad, sarnaselt sellele, kuidas keskkonnamuutujatega t\u00f6\u00f6tatakse OpenSSH-s. Haavatavused on kinnitatud GNU InetUtils paketis. serverilt<\/a> Telnetd, mis tarnitakse Debianis, Ubuntu ja nende tuletistes. Rocky Linux 9 sisaldab muudetud telnetd-d, mis ei ole haavatav, ning kus ohtlike keskkonnaparameetrite filtreerimise asemel on kasutusele v\u00f5etud valge nimekirja kontrollimine. Valge nimekirja filtreerimine on samuti rakendatud FreeBSD telnetd-s. OpenBSD telnetd eemaldati s\u00fcsteemist 2005. aastal.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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