{"id":121998,"date":"2025-02-18T20:22:04","date_gmt":"2025-02-18T18:22:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-openssh-9-9p2-s-ustraneniem-vozmozhnosti-soversheniya-mitm-ataki"},"modified":"2025-02-18T20:22:04","modified_gmt":"2025-02-18T18:22:04","slug":"obnovlenie-openssh-9-9p2-s-ustraneniem-vozmozhnosti-soversheniya-mitm-ataki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/obnovlenie-openssh-9-9p2-s-ustraneniem-vozmozhnosti-soversheniya-mitm-ataki","title":{"rendered":"OpenSSH 9.9p2 uuendus, mis eemaldab MITM-r\u00fcnnakute v\u00f5imaluse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avatud on OpenSSH 9.9p2, mis lahendab kaks haavatavust, mille avastas ettev\u00f5te Qualys. N\u00e4idatud on haavatavuste kasutamise n\u00e4ide MITM-r\u00fcnnaku tegemiseks, mille k\u00e4igus on v\u00f5imalik klient SSH-serveriga \u00fchenduse loomisel suunata liiklus enda vale serverisse, v\u00e4ltida hosti m\u00e4rgiste kontrollimist ja tekitada kliendile vale mulje, et ta on \u00fchendatud soovitud serveriga (ssh-klient aktsepteerib vale serveri hosti m\u00e4rgist selle asemel, et aktsepteerida seadusliku serveri m\u00e4rgist). <\/p>\n

Esimene haavatavus (CVE-2025-26465) tuleneb loogilisest veast ssh-utiliidis, mis v\u00f5imaldab v\u00e4ltida serveri autentimise kontrollimist ja teostada MITM-r\u00fcnnakut. Probleem ilmneb alates versioonist OpenSSH 6.8p1 (detsember 2014) konfiguratsioonides, kus on aktiveeritud VerifyHostKeyDNS seade. OpenSSH p\u00f5hijaotuses on see valik vaikimisi keelatud, kuid kuni m\u00e4rtsini 2023 oli see FreeBSD ssh seadetega aktiveeritud. <\/p>\n

Probleemi olemus on see, et funktsiooni verify_host_key_callback() koodis kontrollitakse funktsiooni verify_host_key() kutsumisel ainult veakoodi «-1», samas kui teised koodid, nagu «-2», j\u00e4etakse t\u00e4helepanuta. Tulemuseks on see, et funktsioon verify_host_key_callback() v\u00f5ib tagastada eduka koodi «0», hoolimata sellest, et funktsioon verify_host_key() tagastab vea «-2». Veakood «-2» tagastatakse funktsiooni verify_host_key() poolt, kui m\u00e4lu on ammendatud. Kui luua tingimused, mis takistavad m\u00e4lu eraldamist funktsioonis verify_host_key(), arvab SSH, et hosti v\u00f5ti on edukalt kontrollitud. Selliste tingimuste loomiseks tagastab r\u00fcndaja vale SSH-server, kuhu klient on suunatud, hosti v\u00f5tme v\u00f5imalikult suure suurusega (256KB), ja samal ajal kasutatakse SSH kliendi poolel m\u00e4lu lekkimist. <\/p>\n

M\u00e4lu lekete loomise tingimused saavutatakse t\u00e4nu teisele haavatavusele (CVE-2025-26466), mis m\u00f5jutab nii ssh klienti kui ka server<\/a> sshd, ja ei n\u00f5uta autentimist. Haavatavus v\u00f5imaldab ammendada protsessile k\u00e4ttesaadavat m\u00e4lu ja p\u00f5hjustada k\u00f5rget CPU koormust, saates suures koguses SSH2_MSG_PING pakette. SSH2_MSG_PING pakettide t\u00f6\u00f6tlejas on m\u00e4lu lekkimine, mis ilmneb alates OpenSSH 9.5p1 (august 2023) v\u00e4ljalaskest. Leekimine tekib seet\u00f5ttu, et iga 16-baidine PING-pakett varustab 256-baidise puhveriga vastuse vormistamiseks, kuid see puhver vabastatakse alles p\u00e4rast v\u00f5tme \u00fcleandmise l\u00f5petamist. Kaitsmiseks soovitatakse seada piiranguid seadete LoginGraceTime, MaxStartups ja PerSourcePenalties abil.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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