{"id":37225,"date":"2019-10-31T22:16:26","date_gmt":"2019-10-31T19:16:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth\/"},"modified":"2019-10-31T22:16:26","modified_gmt":"2019-10-31T19:16:26","slug":"ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/ataka-knob-pozvolyayushhaya-perehvatit-zashifrovannyj-trafik-bluetooth","title":{"rendered":"KNOB-attacken, som g\u00f6r det m\u00f6jligt att avlyssna krypterad Bluetooth-trafik","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avsl\u00f6jade<\/a><\/noindex> information<\/a><\/noindex> about the attack KNOB<\/a><\/noindex> (Key Negotiation Of Bluetooth), which allows for the interception and injection of information in encrypted Bluetooth traffic. By blocking the direct transfer of packets during the negotiation of Bluetooth device connections, an attacker can force a session to use keys containing only 1 byte of entropy, making it possible to apply a brute-force method to determine the encryption key. <\/p>\n

The problem is caused by flaws (CVE-2019-9506) in the Bluetooth BR\/EDR Core 5.1 specification and earlier versions, allowing the use of excessively short encryption keys and failing to prevent an attacker from interfering at the connection negotiation stage to revert to such unreliable keys (packet injection by unauthenticated attackers is possible). The attack can occur during the connection negotiation between devices (established sessions cannot be attacked) and is effective only for connections in BR\/EDR modes (Bluetooth Basic Rate\/Enhanced Data Rate), if both devices are vulnerable. In the event of a successful key cracking, an attacker can decrypt transmitted data and stealthily perform injection into the traffic of arbitrary ciphertext.<\/p>\n

When establishing a connection between two Bluetooth controllers A and B, after authentication via a link key, controller A may propose to use 16 bytes of entropy for the encryption key, and controller B can either accept this value or specify a smaller value if it cannot generate a key of the proposed size. In response, controller A may accept the counter-proposal and activate the encrypted communication channel. At this stage of parameter negotiation, encryption is not applied, allowing the attacker to intercept the data exchange between the controllers and replace the packet with the proposed entropy size. Since the acceptable key size ranges from 1 to 16 bytes, the second controller will accept this value and send its confirmation indicating the same size.<\/p>\n

\"KNOB-attacken,<\/a><\/noindex><\/center><\/p>\n

To reproduce the vulnerability in laboratory conditions (the attacker's activity was emulated on one of the devices), a
\nprototype toolkit<\/a><\/noindex> for conducting the attack is proposed.
\nF\u00f6r en verklig attack m\u00e5ste angriparen befinna sig inom siktomr\u00e5det av offrens enheter och ha m\u00f6jlighet att kortvarigt blockera signalen fr\u00e5n varje enhet, vilket f\u00f6resl\u00e5s att genomf\u00f6ras genom att manipulera signalen eller reaktivt st\u00f6ra. <\/p>\n

Bluetooth SIG, organisationen som ansvarar f\u00f6r utvecklingen av Bluetooth-standarder, publicerade<\/a><\/noindex> justerade specifikationen med nummer 11838, d\u00e4r \u00e5tg\u00e4rder f\u00f6r att blockera s\u00e5rbarheten f\u00f6resl\u00e5s f\u00f6r tillverkare (den minimi storlek f\u00f6r krypteringsnyckeln har h\u00f6jts fr\u00e5n 1 till 7). Problemet i LibreSSL.<\/a><\/noindex> \u00e4r alla<\/a><\/noindex> kopplade till standard Bluetooth-stacken och Bluetooth-chipens fast firmware, inklusive produkter Intel<\/a><\/noindex>, Broadcom, Lenovo<\/a><\/noindex>, Apple<\/a><\/noindex>, Microsoft<\/a><\/noindex>, Qualcomm, Linux, Android<\/a><\/noindex>, Blackberry<\/a><\/noindex> och Cisco<\/a><\/noindex> (av 14 testade chips visade sig alla vara s\u00e5rbara). I Linux-k\u00e4rnans Bluetooth-stack \u00e4r tillagt<\/a><\/noindex> en fix som till\u00e5ter \u00e4ndring av den minimi storleken p\u00e5 krypteringsnyckeln. <\/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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