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yersinia: A FrameWork for layer 2 attacks


Yersinia - A FrameWork for layer 2 attacks


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


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.


-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.
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)
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 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


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


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 :)


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


Yersinia is Copyright (c)




Alfredo Andres Omella <alfredo@yersinia.net> David Barroso Berrueta <tomac@yersinia.net> YERSINIA(8)

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