{"id":120895,"date":"2024-12-08T21:46:03","date_gmt":"2024-12-08T19:46:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-pozvolyayushhie-podmenit-obrazy-i-vypolnit-kod-na-asu-serverah-proekta-openwrt"},"modified":"2024-12-08T21:46:03","modified_gmt":"2024-12-08T19:46:03","slug":"uyazvimosti-pozvolyayushhie-podmenit-obrazy-i-vypolnit-kod-na-asu-serverah-proekta-openwrt","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-pozvolyayushhie-podmenit-obrazy-i-vypolnit-kod-na-asu-serverah-proekta-openwrt","title":{"rendered":"Vulnerabilit\u00e0 che consentono di sostituire le immagini ed eseguire codice sui server ASU del progetto OpenWrt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nel progetto in fase di sviluppo OpenWrt, nel toolkit ASU (Attended SysUpgrade), sono state individuate vulnerabilit\u00e0 critiche (CVE-2024-54143) che possono compromettere gli artefatti di build distribuiti attraverso il servizio sysupgrade.openwrt.org o server ASU di terze parti, consentendo l'installazione di immagini firmware modificate da un attaccante sui sistemi degli utenti che utilizzano la modalit\u00e0 'attended upgrade' per aggiornare i firmware tramite l'interfaccia web selector.openwrt.org o il toolkit da riga di comando attended.sysupgrade.     <\/p>\n<p>Per portare a termine un attacco, un attaccante deve semplicemente inviare una richiesta di build al server ASU (queste richieste possono essere inviate da qualsiasi utente senza autenticazione). Attraverso manipolazioni con un apposito elenco di pacchetti, l'attaccante pu\u00f2 organizzare l'invio di immagini dannose precedentemente generate in risposta a legittime richieste di build da parte di altri utenti.        <\/p>\n<p>Il servizio ASU viene utilizzato in OpenWrt per generare e installare aggiornamenti del firmware senza perdere le impostazioni esistenti e i pacchetti installati dall'utente. Attraverso l'interfaccia web o lo strumento da riga di comando, l'utente invia una richiesta per generare un'immagine del firmware aggiornata, specificando i pacchetti installati nel suo sistema. Dopo poco tempo, il server ASU genera un'immagine corrispondente al contenuto richiesto, dopo di che l'utente la scarica e la installa sul proprio dispositivo. Inoltre, \u00e8 fornita un'opzione che consente di mantenere le impostazioni esistenti nel firmware aggiornato.       <\/p>\n<p>Il server ASU \u00e8 responsabile dell'elaborazione delle richieste degli utenti, avviando una build automatica delle immagini del firmware utilizzando lo strumento ImageBuilder e mantenendo una cache di build precedentemente preparate. Se l'utente richiede un'immagine che \u00e8 gi\u00e0 stata generata in precedenza e mantiene la sua validit\u00e0, il sistema restituisce immediatamente l'immagine esistente dalla cache senza avviare il processo di build. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-newyork\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2797\">server<\/a> Il comportamento dell'attacco \u00e8 stato reso possibile grazie a due vulnerabilit\u00e0:    <\/p>\n<p>Una vulnerabilit\u00e0 nel gestore delle richieste build_reques.py del pacchetto Imagebuilder, che consente di iniettare comandi nel processo di build attraverso nomi di pacchetti specificamente formattati forniti dall'utente. Questa vulnerabilit\u00e0 \u00e8 causata dalla mancanza di un'adeguata verifica dei caratteri speciali nei nomi dei pacchetti prima del loro utilizzo come argomenti per l'utilit\u00e0 make. Sfruttando questa vulnerabilit\u00e0, l'attaccante pu\u00f2 generare sul server immagini dannose del firmware firmate con la corretta chiave di build.  <\/p>\n<ul>\n<li class=\"l\"> Una vulnerabilit\u00e0 nella libreria util.py, causata dal fatto che gli hash SHA-256 utilizzati per verificare la presenza in cache di immagini del firmware gi\u00e0 pronte venivano troncati a 12 caratteri, riducendo significativamente il livello di entropia e consentendo, attraverso la forza bruta, di generare un'immagine dannosa il cui hash corrisponde a quello di un'immagine legittima. Combinata con la vulnerabilit\u00e0 in Imagebuilder, il problema degli hash poteva essere utilizzato dall'attaccante per 'contaminare' la cache del server ASU e posizionarvi immagini dannose restituite alle richieste degli utenti normali.\n<li class=\"l\"> Una vulnerabilit\u00e0 nella libreria util.py, causata dalla troncatura degli hash SHA-256 usati per verificare la presenza di immagini firmware gi\u00e0 pronte nella cache, riducendo la lunghezza a 12 caratteri, ha significativamente abbassato il livello di entropia. Questo ha permesso, attraverso la ricerca di collisioni, di creare un'immagine malevola il cui hash coincideva con quello di un'immagine legittima. In combinazione con la vulnerabilit\u00e0 in Imagebuilder, il problema con gli hash poteva essere sfruttato da un attaccante per 'contaminare' la cache del server ASU, inserendo immagini malevole consegnate in risposta alle richieste degli utenti normali.    <\/ul>\n<p>Si afferma che gli sviluppatori di OpenWrt non abbiano trovato tracce di compromissione dell'infrastruttura del progetto, ma per precauzione hanno reinstallato da zero i sistemi su cui venivano eseguiti i componenti vulnerabili. Il problema non ha interessato le immagini ufficiali distribuite attraverso il sito downloads.openwrt.org, e nell'analisi dei log di build non sono state trovate prove di invio di richieste dannose. Inoltre, poich\u00e9 i server ASU eseguono una pulizia automatica delle build pi\u00f9 vecchie di 7 giorni, \u00e8 stato impossibile condurre un audit delle vecchie build. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1974\">server<\/a>La probabilit\u00e0 di sfruttare le vulnerabilit\u00e0 individuate in pratica per diffondere immagini dannose attraverso l'infrastruttura di OpenWrt \u00e8 valutata dai rappresentanti di OpenWrt come prossima allo zero; tuttavia, si raccomanda agli utenti ASU di sostituire i firmware OpenWrt sui propri dispositivi con la stessa versione.     <\/p>\n<p>Si afferma che gli sviluppatori di OpenWrt non abbiano trovato tracce di compromissione nell'infrastruttura del progetto, ma per precauzione hanno reinstallato i sistemi da zero su cui giravano i componenti vulnerabili. Il problema non ha riguardato le immagini ufficiali distribuite tramite il sito downloads.openwrt.org e, durante l'analisi dei log di build, non sono state trovate tracce di invio di richieste malevole. Tuttavia, poich\u00e9 sui server ASU viene eseguita una pulizia automatica delle build pi\u00f9 vecchie di 7 giorni, effettuare un audit delle build precedenti si \u00e8 rivelato impossibile.       <\/p>\n<p>La probabilit\u00e0 di utilizzare le vulnerabilit\u00e0 identificate nella pratica per diffondere immagini dannose attraverso l'infrastruttura OpenWrt \u00e8 valutata dai rappresentanti di OpenWrt come prossima allo zero; tuttavia, si consiglia agli utenti di ASU di sostituire i firmware OpenWrt sui propri dispositivi con la stessa versione.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62371\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c OpenWrt \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 ASU (Attended SysUpgrade) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2024-54143), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u044b\u0435 \u0430\u0440\u0442\u0435\u0444\u0430\u043a\u0442\u044b, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0435 \u0447\u0435\u0440\u0435\u0437 \u0441\u0435\u0440\u0432\u0438\u0441 sysupgrade.openwrt.org \u0438\u043b\u0438 \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u0435 ASU-\u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u0432 \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0445 \u0434\u043b\u044f \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u0440\u0435\u0436\u0438\u043c &#171;attended upgrade&#187; \u0447\u0435\u0440\u0435\u0437 web-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 selector.openwrt.org \u0438\u043b\u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 attended.sysupgrade. \u0414\u043b\u044f \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-120895","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c OpenWrt \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 ASU (Attended SysUpgrade) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2024-54143), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u044b\u0435 \u0430\u0440\u0442\u0435\u0444\u0430\u043a\u0442\u044b, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0435 \u0447\u0435\u0440\u0435\u0437 \u0441\u0435\u0440\u0432\u0438\u0441 sysupgrade.openwrt.org \u0438\u043b\u0438 \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u0435 ASU-\u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u0432 \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0445 \u0434\u043b\u044f \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u0440\u0435\u0436\u0438\u043c &quot;attended upgrade&quot; \u0447\u0435\u0440\u0435\u0437 web-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 selector.openwrt.org \u0438\u043b\u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u043d\u043e\u0439 \u0441\u0442\u0440\u043e\u043a\u0438 attended.sysupgrade. \u0414\u043b\u044f \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimosti-pozvolyayushhie-podmenit-obrazy-i-vypolnit-kod-na-asu-serverah-proekta-openwrt\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u043e\u0431\u0440\u0430\u0437\u044b \u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u043d\u0430 ASU-\u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 OpenWrt | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c OpenWrt \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0438 ASU (Attended SysUpgrade) \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2024-54143), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u0441\u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u0431\u043e\u0440\u043e\u0447\u043d\u044b\u0435 \u0430\u0440\u0442\u0435\u0444\u0430\u043a\u0442\u044b, \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u043c\u044b\u0435 \u0447\u0435\u0440\u0435\u0437 \u0441\u0435\u0440\u0432\u0438\u0441 sysupgrade.openwrt.org \u0438\u043b\u0438 \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u0435 ASU-\u0441\u0435\u0440\u0432\u0435\u0440\u044b, \u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u043c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u0432 \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0445 \u0434\u043b\u044f \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0448\u0438\u0432\u043e\u043a \u0440\u0435\u0436\u0438\u043c &quot;attended upgrade&quot; 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