{"id":53889,"date":"2019-12-12T00:00:00","date_gmt":"2019-12-11T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-ld-so-openbsd"},"modified":"2020-02-18T14:01:50","modified_gmt":"2020-02-18T11:01:50","slug":"uyazvimost-v-ld-so-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimost-v-ld-so-openbsd","title":{"rendered":"Vulnerabilit\u00e0 in ld.so OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Caricatore dinamico ld.so<\/a><\/noindex>, incluso in OpenBSD, pu\u00f2 in determinate condizioni consentire a SUID\/SGID<\/a><\/noindex>-applicazioni di lasciare la variabile d'ambiente LD_LIBRARY_PATH e pertanto consentire di caricare codice di terze parti nel contesto di un processo eseguito con privilegi elevati. Le patch per correggere la vulnerabilit\u00e0 sono disponibili per le versioni 6.5<\/a><\/noindex> e 6.6<\/a><\/noindex>. Le patch binarie (syspatch<\/a><\/noindex>) per le piattaforme amd64, i386 e arm64 sono gi\u00e0 state avviate in produzione e dovrebbero essere disponibili per il download al momento della pubblicazione di questa notizia.<\/p>\n

La questione \u00e8 che durante l'esecuzione, ld.so prima estrae dal contesto il valore della variabile LD_LIBRARY_PATH, utilizzando la funzione _dl_split_path() per trasformarlo in un array di stringhe \u2014 i percorsi delle directory. Se in seguito si scopre che il processo attuale \u00e8 eseguito come applicazione SUID\/SGID, l'array creato e, di fatto, la variabile LD_LIBRARY_PATH vengono svuotati. Inoltre, se durante il lavoro _dl_split_path() si imbatte in una mancanza di memoria (cosa difficile a causa del limite esplicito sulle dimensioni delle variabili di ambiente di 256 KB, ma teoricamente possibile), la variabile _dl_libpath ricever\u00e0 il valore NULL e la successiva verifica di questa variabile impedir\u00e0 la chiamata a _dl_unsetenv(\u00abLD_LIBRARY_PATH\u00bb).<\/p>\n

La vulnerabilit\u00e0 \u00e8 stata trovata dagli specialisti Qualys<\/a><\/noindex>, cos\u00ec come diverse vulnerabilit\u00e0 precedentemente rivelate.<\/a><\/noindex> I ricercatori di sicurezza che hanno scoperto la vulnerabilit\u00e0 hanno notato l'immediatezza con cui \u00e8 stata risolta: la patch \u00e8 stata preparata e gli aggiornamenti rilasciati entro tre ore dalla notifica ricevuta dal progetto OpenBSD.<\/p>\n

Nota: La vulnerabilit\u00e0 \u00e8 stata assegnata il numero CVE-2019-19726<\/a><\/noindex>. \u00c8 stato fatto un annuncio ufficiale<\/a><\/noindex>, che include un prototipo di exploit funzionante su OpenBSD 6.6, 6.5, 6.2 e 6.1 su architetture
\namd64 e i386 (l'exploit pu\u00f2 essere adattato anche per altre architetture).
\n Il problema \u00e8 sfruttabile in una installazione predefinita e consente a un utente locale non privilegiato di eseguire codice con i diritti di root mediante la sostituzione della libreria durante l'esecuzione delle utility suid chpass o passwd. Per creare le condizioni necessarie all'esploit, viene utilizzato un vincolo di memoria impostando RLIMIT_DATA tramite setrlimit.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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