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Cisco router Tcl script backdoor 2nd tests
Author: Vic
The security of Cisco routers is certain. Password verification is required for remote login. The Cisco passwords are encrypted in the following ways:1 not encrypted, plaintext display
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: single two-way authentication: www.2cto.com 2.2, CHAP authentication: CHAP: Challenge Handshake Authentication Protocol, full name: challenge Handshake Authentication Protocol. CHAP verifies the identity of the authenticated end through a three-way handshake. It is completed when the initial link is established. To improve security, it is periodically verified after the link is established. CHAP is safer than PAP because CHAP does not send plain text online, but instead sends a random number s
Article Title: simulate a cisco router using dynamic in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Environment: centos5.2
Software: dynamic. cisco-ios
1: Download the dynamic binfile.
Wget http://www.ipflow.utc.fr/
CHAP (Challenge Handshake Authentication Protocol) and PAP (Password Authentication Protocol) are generally used to provide security Authentication on PPP encapsulated serial lines. With CHAP and PAP authentication, each Cisco router is identified by a name to prevent unauthorized access.
Task commands
Set the PPP encapsulation ppp1
Set the authentication method
supports SSH. log on to your vro or vswitch and check whether you have loaded an IPSec IOS image that supports SSH.
In our example, we will use the Cisco IOS command. Run the following command:
Router> Show flash
This command displays the name of the loaded IOS image. You can use the result to compare the list of supported features of your supplier.
After you verify that your device supports SSH, make sure
Router upgrade
IOS
Summary
Step 1:
Note:Using a TFTP server software with cisco TFTPServer or 3 CDaemon), 3Cdaemon is faster when the transmitted files are too large. 1. first, place the IOS file in the specified directory and enable the TFTP server software. 2. use the USB to switch to the console line to connect the router to the PC and use the CRT login softwa
1. Preparation Tools
Cisco TFTP server, HyperTerminal, iOS files
iOS files are not easy to find, you need to look at the hardware version, as well as the size of ROM RAM, to my Cisco 2621XM for example (with two fastethernet),Start looking for a few 2600 of iOS, the brush is not correct, the problem of unrecognized network interface, can not be configured, there should be F interface with S Ios,
A Cisco router is detected infected with a secret backdoor.
Security company FireEye researchers reported that backdoor programs called SYNful knock were found on 14 Cisco routers in 4 countries. Cisco has confirmed this. The attack does not take advantage of the vulnerability of the product itself, but requires valid
Cisco router configuration manual Virtual LAN (VLAN) routing 1. The main network technology we currently use when constructing an enterprise network is generally based on exchange and virtual networks. The exchange technology changes shared media to exclusive media, greatly improving the network speed. The Virtual Network Technology breaks the restrictions of the geographical environment. without changing t
Cisco router has become a commonly used network device, but we are not very clear about its storage classification. Here we will introduce it in detail.
Memory category:
1: RAM: Random Access to memory, equivalent to computer memory
2: ROM: read-only memory. Some microcodes used to start and maintain the router are resident in the ROM.
3: FLASH Memory, equiva
server has a set callback, the server dials back the phone number that has been set up or asks the user to choose the callback. below is the specific configuration: ------------------------- Access#show Run Building configuration ... current configuration:1833 bytes !version 12.2 No parser cache No service single-slot-reload-enable Service Timestamps Debug uptime Service Timestamps log uptime No service password-encryption !hostname Acces
...Writing monlib sectors........................................................................................................Monlib Write complete Format:all system sectors written. Ok...Format:operation completed successfully. Format of Flash:completeProgram load complete, entry point:0x8000f000, size:0xcb80(5) TFTP to see if iOS upload is complete.(6) Rommon 8 > Reset//Restart router
Cisco router IOS upload and download 1. Prepare a console line and a network cable. The connection cable is connected to the console port of the computer. The network cable is connected to the computer and the F0/0 port of the router. (Only F0/0 can be used. The router has no system, the IP address configured for the
Cisco router register configuration objective: Register configuration is used to change the router startup process. The Start bit consists of four hexadecimal registers. The value range of 0 xABCD www.2cto.com ranges from 0x0 to 0 xFFFF 0x2102: Industrial default value 0x2142: starts from FLASH, but do not use the configuration file (for
are used
The route of this packet.
---- GRE only provides encapsulation of data packets. It does not have encryption to prevent network listening and attacks. Therefore, in the actual environment, it often corresponds to an IP address.
When the SEC is used together, IPSec provides encryption of user data to provide users with better security.
The GRE protocol has two main purposes: internal protocol encapsulation and private address encapsulation. In China, CEN uses almost all TCP/IP protocols,
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