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CEH > Chapter 4 - Sniffing & Evasion > Flashcards

Chapter 4 - Sniffing & Evasion Flashcards

1
Q

Promiscuous Mode

A

Has to be set manulaly. NIC will grab anything passed on wire regardless of destination. Tools for this: WinPcap and libpcap (linux)

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2
Q

CSMA/CD

A

Carrier Sense Multiple Access/Collision Detection - used over Ethernet to decide who can talk

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3
Q

What protocols are susceptible to sniffing

A

SMTP, FTP, TFTP, IMAP, POP3, NNTP, and HTTP, TCP shows sequence numbers, TCP and UDP show open ports, IP shows source and destination

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4
Q

Collision Domains

A

Traffic sent from your NIC (regardless of mode) ca nonly be seen within the same collision domain. Hubs have 1 collision domain. Switches have one for each port.

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5
Q

arp -d *

A

Clears ARP cache

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6
Q

arp -a

A

Displays current ARP cache

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7
Q

ARP

A

Address Resolution Protocol: Resolves IP address to MAC addresses. Packets are ARP_REQUEST and ARP_REPLY. Arp -a displays arp cache

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8
Q

Gratuitous ARP

A

Special packet to update ARP cache even without a request.

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9
Q

IPV6 Loopback address is what?

A

::1 also uses 128-bit address

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10
Q

IPv6 Address Types

A

Unicast - Addressed and inteded for one host interface. Multicast - Addresssed for multiple host interfaces. Anycast - Large number of hosts can receive; nearest host opens

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11
Q

IPv6 Scopes

A

(Scope applies for multicast and anycast). Link Local - Applies only to hosts on the same subnet (Address block fe80::/10) Site Local: Applie to hosts within the same organization (Address block FEC0::/10). Global: Includes everything

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12
Q

Lawful intercetpion

A

Legally intercepting communications between two parties

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13
Q

Active vs Passive Wiretapping

A

Active - Interjecting something into communication. Passive - Only monitors and records the data.

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14
Q

Active vs Passive Sniffing

A

Passive - Watching network traffic without interaction; only works for same collision domain. Active - Uses methods to make a switch send traffic to you even though it isn’t destined for your machine

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15
Q

Span Port

A

Switch configuration that makes the switch send a copy of all frames from other ports to a specific port. Not all switches can do this.

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16
Q

Network Tap

A

Special port on a switch that allows the connected device to see all traffic.

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17
Q

Port Mirroring

A

Another word for span port

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18
Q

CAM Table

A

The table on a switch that stores which MAC address is on which port. If table is empty or full, everything sent to all ports. This is whats known as MAC flooding

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19
Q

Etherflood

A

Tool uses to cause MAC flooding

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20
Q

Macof

A

Tool used to cause MAC flooding

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21
Q

Switch port stealing

A

Similar to CAM flood. Flood the CAM with unsolicited ARPs. But instead of attempting to fill the table, you’re only interested in updating the information regarding a specific port, causing a race condition

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22
Q

ARP Poisoning

A

Same as ARP Spoof or Gratuitous ARP. Changes the cache of machines so that packets are sent to you instead of intended target.

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23
Q

What are some countermeasures to ARP poisoning ?

A

Dynamic ARP Inspection using DHCP snooping. Xarp can also watch for this. Default gateway MAC can be added permanently to machine’s cache.

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24
Q

ARP Poisoning Tools

A

Cain and Abel, WinArpAttacker, Ufasoft

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25
Q

DHCPv4 Packets

A

DHCPDISCOVER, DHCPOFFER, DHCPREQUEST, DHCPACK

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26
Q

DHCPv6 Packets

A

Solicit, Advertise, Request (confirm/Renew), Reply

27
Q

DHCP Steps

A
  1. Client sends DHCPDISCOVER. 2. Server responds with DHCPOFFER. 3. Client sends request for IP with DHCPREQUEST. 4. Server sends address and config via DHCPACK
28
Q

DHCP Starvation

A

Attempt to exhaust all available addresses from the server.

29
Q

DHCP Starvation Tools

A

Yersinia, DHCPstarv

30
Q

Rogue DHCP Server

A

Fake DHCP server that hands out bad IP addresses to computers on network

31
Q

MAC Spoof vs IRDP Spoof vs DNS Poisoning

A

MAC - Changes your MAC address to have packets sent to yourself. IRDP Spoofing - hacker sends ICMP Router Discovery Protocol message for malicious gateway. DNS Poison - changs where machine gets their DNS info from.

32
Q

Ethereal

A

What Wireshark used to be called. Packet filter

33
Q

What does the following Wireshark filter accomplish: !(arp or icmp or dns)

A

Filters out the “noise” from ARP, DNS, and ICMP requests

34
Q

Wireshark filter: http.request

A

Displays HTTP GET requests

35
Q

ip.addr==172.17.15.12 && tcp.port==23 This filter does what on Wireshark?

A

Displays Telnet packets containing that IP.

36
Q

tcp.flags==0x16 This filter does what on Wireshark?

A

Filters TCP requests with ACK flag set

37
Q

tcpdump -i eth1

A

Puts interface in listening mode

38
Q

tcpdump -w

A

will write results to a file

39
Q

tcpdump syntax

A

tcpdump -i eth1 - puts interface in listening mode. -w will write results to file

40
Q

Windows version of tcpdump is what?

41
Q

tcptrace

A

Analyzes files produced by packet capture programs such as Wireshark, tcpdump, and Etherpeek

42
Q

Ettercap

A

Sniffing tool, can also be used for MITM attacks, ARP poisoning

43
Q

Capsa Network Analyzer

A

Network snsiffer

44
Q

Snort

A

Open source IDS, can be used as a sniffer, traffic logger, and a protocol analyzer. Three modes: Sniffer, Packet Logger, NIDS

45
Q

Sniffing tools

A

Snort, Sniff-O-Matic, EtherPeek, WinDump, WinSniffer

46
Q

What does the following snort rule do: alert tcp !HOME_NET any -> $HOME_NET 31337 (msg : “BACKDOOR ATTEMPT-Backorifice”)

A

This rule tells snort “If you happen to come across any packet from any address that is not my home network, using any source port, intended for an address within my home network on port 31337

47
Q

Dynamic NAT vs Static NAT vs Port Address Translation (PAT)

A

Dynamic: Many to Many , Static: One to Many , Port Address Translation (PAT): Many to One

48
Q

Signature-based vs Anomaly-based IDS

A

Signature - Compares packets against a list of known traffic patterns. Anomaly - Makes decisions on alerts based on learned behavior and “normal” patterns.

49
Q

Screened Subnet

A

Hosts all public-facing servers and services.

50
Q

Bastion Hosts

A

Hosts on the screened subnet designed to protect internal resources.

51
Q

Private Zone

A

Hosts internal hosts that only respond to requests from within that zone

52
Q

Multi-homed Firewall

A

Firewall that has two or more interfaces

53
Q

Stateful Inspection

A

Firewalls that track the entire status of a connection

54
Q

Packet-Filtering

A

Firewalls that only looked at the headers

55
Q

Circuit-level Gateway

A

Firewall that works on Layer 5 (session Layer)

56
Q

Application-level gateway

A

Firewall that works lke a proxy, allowing specific services in or out.

57
Q

Tools for IDS evasion

A

Nessus, ADMmutate (creates scripts nto recognizable by signature files) NIDSbench, Inundator (flooding tool)

58
Q

An ICMP Type 3 Code 13 shows what?

A

Traffic is being blocked by the firewall

59
Q

ICMP Type 3 Code 3 shows that

A

The client itself has the port closed

60
Q

Firewalking

A

Going through every port on a firewall to determine what is open

61
Q

High Interaction vs Low Interaction Honeypot

A

High Interaction: Simulates all services and applications and is designed to be completely compromised. Low Interaction: Simulates a number of services and cannot be completely compromised.

62
Q

Honeypot Tools

A

Specter, Honeyd, KFSensor

63
Q

Tools for firewall evasion

A

CovertTCP, ICMP Shell, 007 Shell

CEH (13 decks)

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