The menace came from below - Hack.lu

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Netfilter Definition Packet filtering framework inside the Linux 2.4.x to 3.x kernel series. Éric Leblond, Victor Julien (OISF) The menace came from below Hack.lu 2012 8 / 66
Netfilter Definition Packet filtering framework inside the Linux 2.4.x to 3.x kernel series. Features Stateful and stateless packet filtering (IPv4 and IPv6). Network address and port translation (NAT). Multiple layers of API’s for 3rd party extensions. Éric Leblond, Victor Julien (OISF) The menace came from below Hack.lu 2012 8 / 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: 1 Introduction Netfilter and the Co
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 and 34: Demonstration of DCC usage Video Le
Page 35 and 36: Objective Determine if it is possib
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
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Demonstration Video Let’s have a
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Policy violation One managed to ope
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There is no problem Swift reaction
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Others protocols IRC As discussed b
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1 Introduction Netfilter and the Co
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Protection for Netfilter We only ha
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Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
IPv6 protection for Netfilter Since
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IPv6 protection for Netfilter The b
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Suricata Rules Largely compatible w
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Suricata Rules Largely compatible w
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Counter measures on Suricata FTP in
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Detecting overlapping data Rule Att
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Detect FTP injection - step 1 Rule
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Detect FTP injection - step 3 Rule
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Detect FTP injection - port Rule In
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Luajit script Simplified Script f u
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Protocol analysis: a difficult task
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Example of nDPI History Originally
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Causing recognition mistake Evading
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Don’t mess with the server Issue
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Implementing the attack in opensvp
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Attack on nDPI Test used Injection
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Detecting very low TTL Example TTL
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Future changes in Suricata We’re
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Using low layer to attack Low layer
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SNMP: Security is Not My Problem Ke
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Questions Thanks to Do you have any
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