{"id":84662,"date":"2020-06-10T01:42:15","date_gmt":"2020-06-09T23:42:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-upnp-podhodyashhaya-dlya-usileniya-ddos-atak-i-skanirovaniya-vnutrennej-seti"},"modified":"2020-06-10T01:42:15","modified_gmt":"2020-06-09T23:42:15","slug":"uyazvimost-v-upnp-podhodyashhaya-dlya-usileniya-ddos-atak-i-skanirovaniya-vnutrennej-seti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/uyazvimost-v-upnp-podhodyashhaya-dlya-usileniya-ddos-atak-i-skanirovaniya-vnutrennej-seti","title":{"rendered":"En s\u00e5rbarhet i UPnP som kan anv\u00e4ndas f\u00f6r att f\u00f6rst\u00e4rka DDoS-attacker och skanna interna n\u00e4tverk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avsl\u00f6jade<\/a><\/noindex> information om s\u00e5rbarheten<\/a><\/noindex> (CVE-2020-12695<\/a><\/noindex>) i protokollet UPnP, vilket m\u00f6jligg\u00f6r att styra trafik till valfri mottagare, genom att anv\u00e4nda den i standarden angivna operationen «SUBSCRIBE». S\u00e5rbarheten har kodnamnet CallStranger<\/a><\/noindex>. S\u00e5rbarheten kan anv\u00e4ndas f\u00f6r att extrahera data fr\u00e5n n\u00e4tverk skyddade av datal\u00e4ckagesystem (DLP), genomf\u00f6ra portskanning av datorer i det interna n\u00e4tverket, samt f\u00f6r att f\u00f6rst\u00e4rka DDoS-attacker med hj\u00e4lp av miljontals UPnP-enheter som \u00e4r anslutna till det globala n\u00e4tverket, s\u00e5som kabelmodem, hemroutrar, spelkonsoler, IP-kameror, TV-mottagare, mediacenter och skrivare.<\/p>\n

Problemet orsakas<\/a><\/noindex> att den f\u00f6reskrivna funktionen «SUBSCRIBE» i specifikationen till\u00e5ter vilken extern angripare som helst att skicka HTTP-paket med rubriken Callback och anv\u00e4nda UPnP-enheten som en proxy f\u00f6r att skicka f\u00f6rfr\u00e5gningar till andra v\u00e4rdar. Funktionen «SUBSCRIBE» \u00e4r definierad i UPnP-specifikationen och anv\u00e4nds f\u00f6r att \u00f6vervaka \u00e4ndringar i andra enheter och tj\u00e4nster. Med hj\u00e4lp av HTTP-rubriken Callback kan vilken URL som helst anges, dit enheten kommer att f\u00f6rs\u00f6ka etablera en anslutning. <\/p>\n

\"En<\/a><\/noindex><\/center><\/p>\n

Problemet p\u00e5verkar n\u00e4stan alla UPnP-implementationer baserade p\u00e5 specifikationen<\/a><\/noindex>, som sl\u00e4pptes f\u00f6re den 17 april. S\u00e5rbarheten har bekr\u00e4ftats<\/a><\/noindex> i den \u00f6ppna paketet hostapd<\/a><\/noindex> med implementationen av en tr\u00e5dl\u00f6s \u00e5tkomstpunkt (WPS AP). Korrigeringen \u00e4r f\u00f6r n\u00e4rvarande tillg\u00e4nglig som patchar<\/a><\/noindex>. I distributionerna har inga uppdateringar sl\u00e4ppts \u00e4n (Debian<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, SUSE<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch<\/a><\/noindex>). Problemet ber\u00f6r ocks\u00e5 l\u00f6sningar baserade p\u00e5 det \u00f6ppna UPnP-stacket<\/a><\/noindex> pupnp , information om korrigeringar f\u00f6r vilket saknas f\u00f6r n\u00e4rvarande.<\/a><\/noindex>UPnP-protokollet definierar en mekanism f\u00f6r automatisk uppt\u00e4ckte av enheter i det lokala n\u00e4tverket och interaktion med dem. Protokollet designades ursprungligen f\u00f6r anv\u00e4ndning i interna lokala n\u00e4tverk och f\u00f6ruts\u00e4tter inga former av autentisering och verifiering. Trots detta st\u00e4nger miljontals enheter inte av st\u00f6d f\u00f6r UPnP p\u00e5 externa n\u00e4tverksgr\u00e4nssnitt och<\/p>\n

f\u00f6rblir tillg\u00e4ngliga f\u00f6r f\u00f6rfr\u00e5gningar fr\u00e5n det globala n\u00e4tverket. En attack kan utf\u00f6ras via vilken som helst liknande UPnP-enhet.<\/a><\/noindex> f\u00f6r f\u00f6rfr\u00e5gningar fr\u00e5n det globala n\u00e4tverket. En attack kan utf\u00f6ras genom vilken liknande UPnP-enhet som helst.
\nTill exempel kan Xbox One-enheter attackeras via n\u00e4tverksport 2869, eftersom de g\u00f6r det m\u00f6jligt att \u00f6vervaka f\u00f6r\u00e4ndringar som att dela inneh\u00e5ll genom kommandot SUBSCRIBE.<\/p>\n

Open Connectivity Foundation (OCF) informerades om problemet i slutet av f\u00f6rra \u00e5ret, men avvisade f\u00f6rst att betrakta det som en s\u00e5rbarhet i specifikationen. Efter en mer detaljerad rapport erk\u00e4ndes problemet och en rekommendation f\u00f6r anv\u00e4ndning av UPnP endast p\u00e5 LAN-gr\u00e4nssnitt lades till specifikationen. Eftersom problemet orsakas av en brist i standarden kan det ta l\u00e5ng tid att \u00e5tg\u00e4rda s\u00e5rbarheten i enskilda enheter, och f\u00f6r \u00e4ldre enheter kanske det inte ens finns n\u00e5gra firmwareuppdateringar.<\/p>\n

Som skydds\u00e5tg\u00e4rder rekommenderas att isolera UPnP-enheter fr\u00e5n externa f\u00f6rfr\u00e5gningar med en brandv\u00e4gg, blockera externa HTTP-f\u00f6rfr\u00e5gningar «SUBSCRIBE» och «NOTIFY» vid intr\u00e5ngsskyddssystem eller st\u00e4nga av protokollet UPnP p\u00e5 externa n\u00e4tverksgr\u00e4nssnitt. Tillverkare rekommenderas att st\u00e4nga av funktionen SUBSCRIBE i standardinst\u00e4llningarna och begr\u00e4nsa den vid aktivering endast till att ta emot f\u00f6rfr\u00e5gningar fr\u00e5n det interna n\u00e4tverket.
\nF\u00f6r att testa sina enheters s\u00e5rbarhet publicerades<\/a><\/noindex> ett specialverktyg, skrivet i Python och distribuerat under MIT-licensen. <\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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