Este disponibil\u0103 o versiune corectiv\u0103 a OpenSSH 9.9p2, \u00een care au fost remediate dou\u0103 vulnerabilit\u0103\u021bi identificate de compania Qualys. A fost demonstrat un exemplu de utilizare a acestor vulnerabilit\u0103\u021bi pentru a efectua un atac MITM, care permite redirec\u021bionarea traficului de la clientul SSH c\u0103tre un server fals, ocolind verificarea cheilor gazdelor \u0219i cre\u00e2nd iluzia utilizatorului c\u0103 se conecteaz\u0103 la serverul dorit (clientul SSH va accepta cheia gazdelor serverului fals \u00een loc de cheia serverului legitim). <\/p>\n
Prima vulnerabilitate (CVE-2025-26465) este rezultatul unei erori logice \u00een utilitarul ssh, care permite ocolirea verific\u0103rii identit\u0103\u021bii serverului \u0219i efectuarea unui atac MITM. Problema apare \u00eencep\u00e2nd cu versiunea OpenSSH 6.8p1 (decembrie 2014) \u00een configura\u021bii cu op\u021biunea VerifyHostKeyDNS activat\u0103. \u00cen versiunea de baz\u0103 a OpenSSH, aceast\u0103 op\u021biune este dezactivat\u0103 \u00een mod implicit, \u00eens\u0103 p\u00e2n\u0103 \u00een martie 2023 a fost activat\u0103 \u00een set\u0103rile ssh pe FreeBSD. <\/p>\n
Problema const\u0103 \u00een faptul c\u0103 \u00een codul func\u021biei verify_host_key_callback() la apelarea func\u021biei verify_host_key() se verific\u0103 doar codul de eroare «-1», iar alte coduri, cum ar fi «-2», sunt ignorate. Drept urmare, func\u021bia verify_host_key_callback() poate returna un cod de succes «0», \u00een ciuda return\u0103rii unei erori «-2» de c\u0103tre func\u021bia verify_host_key(). Codul de eroare «-2» este returnat de func\u021bia verify_host_key() \u00een cazul lipsei de memorie. Dac\u0103 se creeaz\u0103 condi\u021bii care vor duce la imposibilitatea aloc\u0103rii memoriei \u00een func\u021bia verify_host_key(), SSH va considera c\u0103 cheia gazdei a fost verificat\u0103 cu succes. Pentru a crea astfel de condi\u021bii, un server SSH falsificat al atacatorului, la care clientul este redirec\u021bionat, returneaz\u0103 cheia gazdei de dimensiune maxim\u0103 posibil\u0103 (256KB), iar \u00een acela\u0219i timp se exploateaz\u0103 o scurgere de memorie pe partea ssh-clientului. <\/p>\n
Condi\u021biile pentru crearea scurgerii de memorie sunt realizate datorit\u0103 celei de-a doua vulnerabilit\u0103\u021bi (CVE-2025-26466), care afecteaz\u0103 at\u00e2t clientul ssh, c\u00e2t \u0219i serverul<\/a> sshd, \u0219i utilizat f\u0103r\u0103 autentificare. Vulnerabilitatea permite epuizarea memoriei disponibile procesului \u0219i crearea unei sarcini ridicate pe CPU prin trimiterea unui num\u0103r mare de pachete SSH2_MSG_PING. \u00cen procesorul de pachete SSH2_MSG_PING exist\u0103 o scurgere de memorie, care se manifest\u0103 \u00eencep\u00e2nd cu versiunea OpenSSH 9.5p1 (august 2023). Scurgerea apare deoarece pentru fiecare pachet PING de 16 bytes primit se aloc\u0103 un buffer de 256 bytes pentru a forma r\u0103spunsul, dar acest buffer este eliberat doar dup\u0103 finalizarea negocierii cheilor. Ca o solu\u021bie temporar\u0103 de protec\u021bie, se propune configurarea limit\u0103rilor prin directivele LoginGraceTime, MaxStartups \u0219i PerSourcePenalties. \u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a OpenSSH 9.9p2, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Qualys. \u041f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d \u043f\u0440\u0438\u043c\u0435\u0440 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0434\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f MITM-\u0430\u0442\u0430\u043a\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043f\u0440\u0438 \u043f\u043e\u043f\u044b\u0442\u043a\u0435 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u043a SSH-\u0441\u0435\u0440\u0432\u0435\u0440\u0443, \u043f\u0435\u0440\u0435\u043d\u0430\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0442\u0440\u0430\u0444\u0438\u043a \u043d\u0430 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0441\u0435\u0440\u0432\u0435\u0440, \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0443 \u0445\u043e\u0441\u0442\u043e\u0432\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439 \u0438 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u0443 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0432\u0438\u0434\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u043a \u0436\u0435\u043b\u0430\u0435\u043c\u043e\u043c\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0443 (ssh-\u043a\u043b\u0438\u0435\u043d\u0442 \u043f\u0440\u0438\u043c\u0435\u0442 \u0445\u043e\u0441\u0442\u043e\u0432\u044b\u0439 \u043a\u043b\u044e\u0447 \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432\u043c\u0435\u0441\u0442\u043e \u043a\u043b\u044e\u0447\u0430 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Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"