{"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\/da\/blog\/news\/uyazvimost-v-upnp-podhodyashhaya-dlya-usileniya-ddos-atak-i-skanirovaniya-vnutrennej-seti","title":{"rendered":"S\u00e5rbarhed i UPnP, der er velegnet til at forst\u00e6rke DDoS-angreb og scanne interne netv\u00e6rk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Afsl\u00f8rede<\/a><\/noindex> information about s\u00e5rbarheder<\/a><\/noindex> (CVE-2020-12695<\/a><\/noindex>) i protokollen UPnP, der muligg\u00f8r afsendelse af trafik til enhver given modtager ved at bruge den operation, der er angivet i standarden «SUBSCRIBE». S\u00e5rbarheden er tildelt kodenavn CallStranger<\/a><\/noindex>. This vulnerability can be exploited to extract data from networks protected by Data Loss Prevention (DLP) systems, facilitate port scanning of internal network computers, and amplify DDoS attacks using millions of UPnP devices connected to the global network, such as cable modems, home routers, game consoles, IP cameras, TV set-top boxes, media centers, and printers.<\/p>\n

Problemet er for\u00e5rsaget<\/a><\/noindex> at den funktion, der er specificeret i dokumentet «SUBSCRIBE», tillader enhver ekstern angriber at sende HTTP-pakker med Callback-headeren og bruge UPnP-enheden som en proxy til at sende anmodninger til andre v\u00e6rter. Funktionen «SUBSCRIBE» er defineret i UPnP-specifikationen og bruges til at overv\u00e5ge \u00e6ndringer i andre enheder og tjenester. Ved hj\u00e6lp af HTTP-headeren Callback kan en vilk\u00e5rlig URL angives, som enheden vil fors\u00f8ge at oprette forbindelse til. <\/p>\n

\"S\u00e5rbarhed<\/a><\/noindex><\/center><\/p>\n

The problem affects almost all UPnP implementations based on specifikationerne<\/a><\/noindex>, released before April 17. Vulnerability has been confirmed<\/a><\/noindex> in an open package hostapd<\/a><\/noindex> with a wireless access point (WPS AP) implementation. A fix is currently available in the form of patches<\/a><\/noindex>. Updates have not yet been released in distributions (Debian<\/a><\/noindex>, OpenWRT<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, SUSE<\/a><\/noindex>, Fedora<\/a><\/noindex>, Arch<\/a><\/noindex>). The issue also affects<\/a><\/noindex> solutions based on the open UPnP stack pupnp<\/a><\/noindex>, for which no information about fixes is currently available.<\/p>\n

The UPnP protocol defines a mechanism for automatic discovery of devices in the local network and interaction with them. The protocol was originally designed for use in internal local networks and does not provide for any forms of authentication or verification. Despite this, millions of devices do not disable UPnP support on external network interfaces and remain accessible<\/a><\/noindex> for requests from the global network. An attack can be carried out through any such UPnP device.
\nFor example, Xbox One consoles can be attacked through network port 2869, as they allow monitoring changes, such as sharing content, using the SUBSCRIBE command.<\/p>\n

Open Connectivity Foundation (OCF) blev informeret om problemet i slutningen af sidste \u00e5r, men afslog i starten at betragte det som en s\u00e5rbarhed i specifikationen. Efter en mere detaljeret rapport blev problemet anerkendt, og der blev tilf\u00f8jet et krav i specifikationen om at anvende UPnP kun p\u00e5 LAN-gr\u00e6nseflader. Da problemet er for\u00e5rsaget af mangler i standarden, kan det tage lang tid at rette s\u00e5rbarheden i enkelte enheder, og for \u00e6ldre enheder kan firmwareopdateringer muligvis ikke blive tilg\u00e6ngelige.<\/p>\n

Som en beskyttelsesforanstaltning anbefales det at isolere UPnP-enheder fra eksterne foresp\u00f8rgsler ved hj\u00e6lp af en firewall, blokere eksterne HTTP-anmodninger «SUBSCRIBE» og «NOTIFY» p\u00e5 angrebsforebyggende systemer, eller deaktivere UPnP-protokollen p\u00e5 eksterne netv\u00e6rksgr\u00e6nseflader. Producenter anbefales at deaktivere SUBSCRIBE-funktionen som standard og kun tillade modtagelse af anmodninger fra det interne netv\u00e6rk ved aktivisering.
\nTil test af s\u00e5rbarhed af deres enheder udgivet<\/a><\/noindex> et s\u00e6rligt v\u00e6rkt\u00f8j, skrevet i Python og distribueret under MIT-licensen. <\/p>\n

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

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

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