Christopher Avilla. What is MiTM?Computer MiTMGSM MiTM Tips for Detection of MiTM.

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Presentation transcript:

Christopher Avilla

What is MiTM?Computer MiTMGSM MiTM Tips for Detection of MiTM

Alice "Hi Bob, it's Alice. Give me your key"--> Mallory Bob Alice Mallory "Hi Bob, it's Alice. Give me your key"--> Bob Alice Mallory <--[Bob's_key] Bob Alice <--[Mallory's_key] Mallory Bob Alice "Meet me at the bus stop!"[encrypted with Mallory's key]--> Mallory Bob Alice Mallory "Do not meet me!"[encrypted with Bob's key]--> Bob

Computer Network – ARP cache poisoning Cell Phone Networks – IMSI catcher and VBTS RFID Chips and Readers

Send ARP Reply to Client acting as Server Send ARP Reply to Server acting as Client Then View, Edit, Modify and Inject packets to and from target

Cain and Able EttercapDsniff

Injection DNS Spoofing SSL Strip Sniffing

International Mobile Subscriber Identity (IMSI) GSM equivalent to a username Universal Software Radio Peripheral (USRP)

Ability for base station to tell hand set that it will not get cipher Plain text between phone and SIM card

Secret Key in SIM Card Base station sends 128 bit Random number SIM Card concats 128 with Secret Key Hashes the result and splits in two Half is sent back to base station Half is used for cypher A5 A53 is 3G encryption

OpenBTS Hooks in to Asterisk (VoIP) SIP proxy with voice changer Target specific phone number and route all calls to 911 Sniff all SIP packets and replay conversations

Third Party Applications – AntiARP or XArp netcut/ netcut/ Look at your ARP table by ARP/a or ARP –a Use static ARP tables A fine tuned IDS will alert you when youve fallen GSM phone should alert you when non-encrypted

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