365-Day: HTTPS Cookie Stealing. Mike Perry Riverbed Technology DEFCON 2008
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1 365-Day: HTTPS Cookie Stealing Mike Perry Riverbed Technology DEFCON 2008
2 Who am I? Volunteer Tor developer Work on Torbutton, TorFlow Privacy advocate, censorship opponent Forward+Reverse Engineer at Riverbed Flexitarian Random Hacker Wrote a page-based malloc debugger Wrote an IRC bot that got quoted as a human in a major magazine
3 Why am I doing this? Exploit is not new or complicated... However: Vector is not narrow or wifi-only Sophisticated attackers can drain bank accounts with custom cable/dsl modems It also harms safe Tor usage, and that pisses me off Many sites are vulnerable, and don't seem to care. Response: Release a tool showing how bad this is Basic Proof of concept mechanisms did not work Encourage (correct and secure) SSL adoption It's a ONE BIT FIX PEOPLE!
4 Cookie Basics Variables set by websites in your browser Used for authentication, tracking, storage Several properties that govern when transmitted Domain Path Expiration SSL bit (seldom used, this is where the fun begins)
5 The 'SideJacking' Attack Glorified sniffer Sniffs cookies transmitted via plaintext http Janky proxy based approach to do control+saving Completely passive: User must visit target site Able to save domain and path info Path info may be too specific Can lead to issues Admirable PR machine for such a simple hack Waay exceeds my PR abilities. Little help? :)
6 Active HTTP Cookie Hijacking Like CSRF, but we want the data transmitted, not any particular result In fact, the server can reject the request Scenario: Yesterday: User logs in to mail.yahoo.com. Checks "Remember me." Today: User visits via open wifi Today: We inject <img src=" Today: Browser transmits yahoo cookies for image Today: We sniff cookies, write them to cookies.txt Tomorrow: Use cookies.txt to read their mail
7 Active HTTPS Cookie Hijacking New Scenario: Yesterday: User logs in to Today: User visits via open wifi Today: We inject <img src= Today: Browser transmits unprotected gmail GX cookie for http image fetch Today: We sniff cookies, write them to cookies.txt Tomorrow: Use cookies.txt to read their mail User never even checks gmail on hostile network!
8 Vectors Not just open wifi ARP poisoning DHCP spoofing Dan Kaminsky's DNS Hijacking Attack DSL+Cable modem networks? Possible to sniff+inject on cable networks? Sometimes DOCSIS encryption, but many modes are weak May require two modems One custom with TX/RX frequencies switched Or custom software modem! (Guy Martin's talk)
9 'Manual' Attack Aka: How people were owned for the past 365 days. Fire up wireshark Fire up airpwn/netsed with custom rule Copy cookies out of wireshark. Lame.
10 Introducing CookieMonster Fully automated pylorcon tool for cookie gathering Caches DNS responses Listens for 443 connections Uses cache to map IP to domain name Stores IP+host into injection queue Next time IP connects to ANY http website: Inject <img src= > Gathers any resulting cookies and writes cookies.txt file for use in Firefox 2
11 Ok, so there is some configuration.. Need cookie path for injection for some sites No worries. List of paths for popular sites provided! Might want to steal other non-ssl sites too No worries. Additional target list can be provided!
12 Feed the Monster Some COokies!1!
13 Much Better
14 Bonus: (>?)40% of Internet's Gmail! 1. Search for 'CAU metasploit DNS hijack' 2. Scan for vulnerable DNS servers (>40% of net) 3. Hijack *.google.com to point to your transproxy 4. Inject imgs into welcome page 5. Modify CookieMonster to only passively collect cookies at your IP (2 line change) 6.??? 7. PROFIT!
15 How to Protect Yourself Now Use ForceHTTPS Firefox addon (complicated) Use Gmail HTTPS pref (if available) Log out when done Clear cookies regularly
16 Thanks Damon McCoy for additional cards+headers Colin Jackson for ForceHTTPS and other work Nick Weaver for suggestions and correspondence LORCON, pylorcon, dpkt teams/authors
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