The menace came from below - Hack.lu

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$\H1B%-12345X@PJL JOB “HackingPrinters”$

1 Introduction Netfilter and the Conntrack Degree of freedom in Netfilter helpers 2 Multi-layer attack Conditions and principles FTP case Checkpoint Others protocols 3 Impact and existing protection Netfilter Detecting the attack 4 Protocol analysis attack Protocol analysis Low TTL attack The attack on nDPI and Suricata 5 Conclusion Éric Leblond, Victor Julien (OISF) The menace came from below Hack.lu 2012 18 / 66
Objective Determine if it is possible as client to trigger unwanted behaviour Can we open arbitrary pinholes through a firewall? Can we open more ports on a server? Can we access to badly protected service ? Such as an internal database Such as vulnerable services Éric Leblond, Victor Julien (OISF) The menace came from below Hack.lu 2012 19 / 66
Page 1 and 2: The menace came from below Éric Le
Page 3 and 4: Victor Julien a.k.a Inliniac Dutch
Page 5 and 6: Suricata Features High performance,
Page 7 and 8: 1 Introduction Netfilter and the Co
Page 9 and 10: Netfilter Definition Packet filteri
Page 11 and 12: Application Level Gateway Non-linea
Page 13 and 14: The example of FTP FTP client Logge
Page 15 and 16: The example of FTP FTP client Logge
Page 17 and 18: Details of Netfilter implementation
Page 19 and 20: Do I use helpers? What happens if I
Page 21 and 22: Do I use helpers? What happens if I
Page 23 and 24: Global analysis Sane defaults Dange
Page 25 and 26: FTP analysis If we follow RFC (loos
Page 27 and 28: IRC analysis The DCC command DCC co
Page 29 and 30: Using DCC command Client NATed behi
Page 31 and 32: Using DCC command Client NATed behi
Page 33: Demonstration of DCC usage Video Le
Page 37 and 38: Attack description Existing attacks
Page 39 and 40: Attack description Existing attacks
Page 41 and 42: Attack description for FTP 1 The at
Page 47 and 48: Demonstration on Netfilter Video É
Page 49 and 50: Policy violation We’ve manage to
Page 51 and 52: Policy violation We’ve manage to
Page 53 and 54: Counter-measures Anti-spoofing is s
Page 55 and 56: Counter-measures Anti-spoofing is s
Page 57 and 58: Checkpoint setup Checkpoint absolut
Page 59 and 60: Demonstration setup Éric Leblond,
Page 61 and 62: Demonstration setup Let’s do a fi
Page 63 and 64: Demonstration Video Let’s have a
Page 65 and 66: Policy violation One managed to ope
Page 67 and 68: There is no problem Swift reaction
Page 69 and 70: Others protocols IRC As discussed b
Page 71 and 72: 1 Introduction Netfilter and the Co
Page 73 and 74: Protection for Netfilter We only ha
Page 81 and 82: IPv6 protection for Netfilter Since
Page 83 and 84: IPv6 protection for Netfilter The b
Page 85 and 86:
Suricata Rules Largely compatible w
Page 87 and 88:
Suricata Rules Largely compatible w
Page 89 and 90:
Counter measures on Suricata FTP in
Page 91 and 92:
Detecting overlapping data Rule Att
Page 93 and 94:
Detect FTP injection - step 1 Rule
Page 95 and 96:
Detect FTP injection - step 3 Rule
Page 97 and 98:
Detect FTP injection - port Rule In
Page 99 and 100:
Luajit script Simplified Script f u
Page 101 and 102:
Protocol analysis: a difficult task
Page 103 and 104:
Example of nDPI History Originally
Page 105 and 106:
Causing recognition mistake Evading
Page 107 and 108:
Don’t mess with the server Issue
Page 109 and 110:
Implementing the attack in opensvp
Page 111 and 112:
Attack on nDPI Test used Injection
Page 113 and 114:
Detecting very low TTL Example TTL
Page 115 and 116:
Future changes in Suricata We’re
Page 117 and 118:
Using low layer to attack Low layer
Page 119 and 120:
SNMP: Security is Not My Problem Ke
Page 121 and 122:
Questions Thanks to Do you have any
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