YERSINIA(8)

NAME
Yersinia - A FrameWork for layer 2 attacks

SYNOPSIS
yersinia [-hVGIDd] [-l logfile] [-c conffile] protocol [-M] [protocol_options]

DESCRIPTION
yersinia is a framework for performing layer 2 attacks. The following protocols have been implemented in Yersinia current version: Spanning Tree Protocol (STP), VLAN Trunking Protocol (VTP), Hot Standby Router Protocol (HSRP), Dynamic Trunking Protocol (DTP), IEEE 802.1Q, Cisco Discovery Protocol (CDP), Dynamic Host Configuration Protocol (DHCP) and, finally, the Inter-Switch Link Protocol (ISL). Some of the attacks implemented will cause a DoS in a network, other will help to perform any other more advanced attack, or both. In addition, some of them will be first released to the public since there isn't any public implementation. Yersinia will definitely help both pen-testers and network administrators in their daily tasks. Some of the mentioned attacks are DoS attacks, so TAKE CARE about what you're doing because you can convert your network into an UNSTABLE one. A lot of examples are given at this page EXAMPLES section, showing a real and useful program execution.

OPTIONS

-h, --help
    Help screen.

-V, --Version
    Program version.

-G  Start a graphical GTK session.

-I, --interactive
    Start an interactive ncurses session.

-D, --daemon
    Start the network listener for remote admin (Cisco CLI emulation).

-d  Enable debug messages.

-l logfile
    Save the current session to the file logfile. If logfile exists, the data will be appended at the end.

-c conffile
    Read/write configuration variables from/to conffile.

-M  Disable MAC spoofing.

PROTOCOLS
The following protocols are implemented in yersinia current version:

Spanning Tree Protocol (STP and RSTP)

Cisco Discovery Protocol (CDP)

Hot Standby Router Protocol (HSRP)

Dynamic Host Configuration Protocol (DHCP)

Dynamic Trunking Protocol (DTP)

IEEE 802.1Q

VLAN Trunking Protocol (VTP)

Inter-Switch Link Protocol (ISL)

PROTOCOLS OPTIONS

Spanning Tree Protocol (STP): is a link management protocol that provides path redundancy while preventing undesirable loops in the network. The supported options are:

-version version
    BPDU version (0 STP, 2 RSTP, 3 MSTP)

-type type
    BPDU type (Configuration, TCN)

-flags flags
    BPDU Flags

-id id
    BPDU ID

-cost pathcost
    BPDU root path cost

-rootid id
    BPDU Root ID

-bridgeid id
    BPDU Bridge ID

-portid id
    BPDU Port ID

-message secs
    BPDU Message Age

-max-age secs
    BPDU Max Age (default is 20)

-hello secs
    BPDU Hello Time (default is 2)

-forward secs
    BPDU Forward Delay

-source hw_addr
    Source MAC address

-dest hw_addr
    Destination MAC address

-interface iface
    Set network interface to use

-attack attack
    Attack to launch

Cisco Discovery Protocol (CDP): is a Cisco propietary Protocol which main aim is to let Cisco devices to communicate to each other about their device settings and protocol configurations. The supported options are:

-source hw_addr
    MAC Source Address

-dest hw_addr
    MAC Destination Address

-v version
    CDP Version

-ttl ttl
    Time To Live

-devid id
    Device ID

-address address
    Device Address

-port id
    Device Port

-capability cap
    Device Capabilities

-version version
    Device IOS Version

-duplex 0|1
    Device Duplex Configuration

-platform platform
    Device Platform

-ipprefix ip
    Device IP Prefix

-phello hello
    Device Protocol Hello

-mtu mtu
    Device MTU

-vtp_mgm_dom domain
    Device VTP Management Domain

-native_vlan vlan
    Device Native VLAN

-voip_vlan_r req
    Device VoIP VLAN Reply

-voip_vlan_q query
    Device VoIP VLAN Query

-t_bitmap bitmap
    Device Trust Bitmap

-untrust_cos cos
    Device Untrusted CoS

-system_name name
    Device System Name

-system_oid oid
    Device System ObjectID

-mgm_address address
    Device Management Address

-location location
    Device Location

-attack attack
    Attack to launch

Hot Standby Router Protocol (HSRP):

Inter-Switch Link Protocol (ISL):

VLAN Trunking Protocol (VTP):

Dynamic Host Configuration Protocol (DHCP):

IEEE 802.1Q:

Dynamic Trunking Protocol (DTP):

ATTACKS

Attacks Implemented in STP:

0: NONDOS attack sending conf BPDU

1: NONDOS attack sending tcn BPDU

2: DOS attack sending conf BPDUs

3: DOS attack sending tcn BPDUs

4: NONDOS attack Claiming Root Role

5: NONDOS attack Claiming Other Role

6: DOS attack Claiming Root Role with MiTM

Attacks Implemented in CDP:

0: NONDOS attack sending CDP packet

1: DOS attack flooding CDP table

2: NONDOS attack Setting up a virtual device

Attacks Implemented in HSRP:

0: NONDOS attack sending raw HSRP packet

1: NONDOS attack becoming ACTIVE router

2: NONDOS attack becoming ACTIVE router (MITM)

Attacks Implemented in DHCP:

0: NONDOS attack sending RAW packet

1: DOS attack sending DISCOVER packet

2: NONDOS attack creating DHCP rogue server

3: DOS attack sending RELEASE packet

Attacks Implemented in DTP:

0: NONDOS attack sending DTP packet

1: NONDOS attack enabling trunking

Attacks Implemented in 802.1Q:

0: NONDOS attack sending 802.1Q packet

1: NONDOS attack sending 802.1Q double enc. packet

2: DOS attack sending 802.1Q arp poisoning

Attacks Implemented in VTP:

0: NONDOS attack sending VTP packet

1: DOS attack deleting all VTP vlans

2: DOS attack deleting one vlan

3: NONDOS attack adding one vlan

4: DOS attack Catalyst zero day

Attacks Implemented in ISL:

None at the moment

GTK GUI
The GTK GUI (-G) is a GTK graphical interface with all of the yersinia powerful features and a professional 'look and feel'.

NCURSES GUI
The ncurses GUI (-I) is a ncurses (or curses) based console where the user can take advantage of yersinia powerful features. Press 'h' to display the Help Screen and enjoy your session :)

NETWORK DAEMON
The Network Daemon (-D) is a telnet based server (ala Cisco mode) that listens by default in port 12000/tcp waiting for incoming telnet connections. It supports a CLI similar to a Cisco device where the user (once authenticated) can display different settings and can launch attacks without having yersinia running in her own machine (specially useful for Windows users).

EXAMPLES
- Send a Rapid Spanning-Tree BPDU with port role designated, port state agreement, learning and port id 0x3000 to eth1: yersinia stp -attack 0 -version 2 -flags 5c -portid 3000 -interface eth1 - Start a Spanning-Tree nonDoS root claiming attack in the first nonloopback interface (keep in mind that this kind of attack will use the first BPDU on the network interface to fill in the BPDU fields properly): yersinia stp -attack 4 - Start a Spanning-Tree DoS attack sending TCN BPDUs in the eth0 interface with MAC address 66:66:66:66:66:66: yersinia stp -attack 3 -source 66:66:66:66:66:66

SEE ALSO
The README file contains more in-depth documentation about the attacks.

COPYRIGHT
Yersinia is Copyright (c)

BUGS
Lots

AUTHORS
Alfredo Andres Omella <alfredo@yersinia.net>
David Barroso Berrueta <tomac@yersinia.net>