{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

bh-us-03-ornaghi-valleri

blackhat conference usa 2003 blackhat 23 downgrade

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ce - USA 2003 Blackhat 23 Downgrade Attacks L2TP rollback L2TP can use IPSec ESP as transport layer (stronger L2TP than PPTP) By default L2TP is tried before PPTP By Blocking ISAKMP packets results in an IPSec failure Blocking Client starts a request for a PPTP tunnel (rollback) Client Now you can perform PPTP previous attacks Now Blackhat Conference - USA 2003 Blackhat 24 PPTP Attack DEMO Blackhat Conference - USA 2003 Blackhat 25 MITM attacks Different attacks in different scenarios: scenarios: LOCAL AREA NETWORK: - ARP poisoning - DNS spoofing - Port stealing - STP mangling FROM LOCAL TO REMOTE (through a gateway): - ARP poisoning - DNS spoofing - ICMP redirection - IRDP spoofing - DHCP spoofing - route mangling REMOTE: - DNS poisoning - route mangling - traffic tunneling WIRELESS: - Access Point Reassociation Blackhat Conference - USA 2003 Blackhat 26 MITM attacks ARP poisoning ARP is stateless (we all knows how it works and what ARP the problems are) Some operating systems do not update an entry if it is Some not already in the cache, others accept only the first received reply (e.g solaris) The attacker can forge a spoofed ICMP packets to force The the host to make an ARP request. Immediately after the ICMP it sends the fake ARP replay Usefull on switched lan (the switch will not notice the Usefull attack) Blackhat Conference - USA 2003 Blackhat 27 MITM attacks ARP poisoning - countermeasures countermeasures YES - passive monitoring (arpwatch) YES YES - active monitoring (ettercap) YES YES - IDS (detect but not avoid) YES YES - Static ARP entries (avoid it) YES YES - Secure-ARP (public key auth) YES NO - Port security on the switch NO NO - anticap, antidote, middleware approach NO Blackhat Conference - USA 2003 Blackhat 28 ARP Poisoning DEMO (all we have done until now …) Blackhat Conference - USA 2003 Blackhat 29 ARP Poisoning Antidote Kernel Patch http://www. securityfocus.com/archive/1/299929 http...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern