Telnet Puns

Each week, I thought I'd post these SysAdmin tools, tips, tutorials etc.

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Here are the most-interesting items that have come across our desks, laptops and phones this week. As always, Hornetsecurity has no known affiliation with any of these unless we explicitly state otherwise.

** We're looking for your favorite tools and resources to share with the community... the ones that help you do your job better and more easily. Please comment with your favorite(s) and we'll be featuring them over the following weeks.

A Script

[PowerShell] Advanced HTML reporting explains how you can use some simple scripting to create feature-rich reports you can share. Author MadBoyEvo clarifies, "While it says in the title Advanced HTML reporting, it's actually advanced in terms of what you can achieve, but not complicated to use."

A Tip

Some sage career advice for the junior sysadmin, compliments of cliffhnz: "Never EVER be afraid to ask! That’s how you learn! Maybe they are doing [whatever you are wondering about] purely out of habit and shouldn’t. Maybe they have found that after following all instruction from the maker of the software… for now, this is the “easiest way” to get things done. Be curious. Ask away. This is what gets a junior up to a senior level, gaining knowledge."

A Free eBook

A SysAdmin Guide to Azure IaaS – 2nd Edition is a free 100+ page guide from Altaro that teaches how to set up and maintain a high-performing Azure IaaS environment. Covers the whys and hows of VM sizing and deployment, migration, storage & networking, security & identity, infrastructure as code, backup & replication, Azure

I would like to write a simple Python script to check and filter the stream of information available from the reverse beacon network (or cluster).

Several times a day, my internet provider cuts my internet connectivity for few tens of seconds. This is enough to make the telnet link lost. When this happens, my python script (below) does not resume but does not print any error message (or catch exceptions): it hangs.

I need to find a way to check that the connection is not there anymore and restart/reopen the telnet connection.

This is a minimal code able to reproduce the problem, I reported:

----8<-----

import telnetlibfrom time import sleeptn = telnetlib.Telnet("telnet.reversebeacon.net", 7000, timeout=5)sleep(2)line = tn.read_until(b"Please enter your call: ", 100)tn.write(b"T3ST\n")sleep(1)while True:try:line = tn.read_very_eager()#line = tn.read_very_lazy()if b'DX' in line:print(line.decode("utf-8")[:-1])except EOFError:print("Something went wrong....")----8<-----

First of all print("Something went wrong....")is never executed.

As I unplug my internet connection (for at least 10-15s) - simulating the episodic interruptions from my internet provider, the stream of text from the server stops, does not resume, and the code hangs.

It is obvious that the telnet session has been dropped by the server, however the client still does not return any exception. I would really love to restart the connection and restart the data streaming.

Edit: indentation is correct, in the original code. I cannot make Reddit markdown working today.

Im working in a previously existing switch that I did not configure. I'm trying to enable SSH. Telnet works, but when SSH prompts for username and password, I get Access Denied, even though the user i am using is privilege 15. I'm sure I am missing something STUPID. any help would be awesome. I am able to log into the Web GUI with no issue. Here are the VTY lines:

line con 0
  stopbits 1
line aux 0
  stopbits 1
line vty 0 4
  password XXXX
  login
line vty 5 15
  login local
  transport input ssh

Hi neo geo gamers,

Just a quick announcement that it is now possible to TTY access the NGM over USB only, without the need of soldering to the UART pins on the PCB. Today, I was able to telnet in to my NGM remotely over fast ethernet using a USB adapter. Hoping that this will kickstart other developers to help in finally expanding the homebrew scene with this device. See my Gitlab projects for details and feel free to ask questions!

Reub

https://gitlab.com/reubenajohnston/mips-toolchain https://gitlab.com/reubenajohnston/uartdownloader

Consider this website: http://www.httpbin.org/basic-auth/user/passwd

If I use my browser, I just need to provide the username/password once. There is no requirement to provide it again on subsequent requests to the same page. On the other hand, I have to provide the authentication credentials every time in the case of telnet.

Why is it so?

I have a local server that i use for testing, when tryin' to access it with Putty via SSH or Telnet it just stops working and disconnects everyone i have to reboot, i can't even access the admin panel because of error timed out.This is wifi only (since my server is connected to the wifi) as with my cabled pc i can still continue browsing but i can't access the router via DG and the wifi becomes unreachable. Router model D7000v2 latest firmware.

EDIT: after some changes it just dies even with ethernet, disabling beamforming helped increasing the duration of the session to 15-20 minutes.

Ssh crashes the router instantly on login (username and password) even if i can get the key so the first connection is happening.Telnet takes a little more i could login and use a couple of commands, it lasted 4-5 minutes more but then died the same way ssh did.

So, I kinda can get on a Telnet BBS via the following:

- UltraSatan2 for a hard drive install so that I can pre-load drivers

- NetUSBee for physical network connectivity

- STiNG for driver for NetUSBee

- STiK for compatibility with the Telnet Program

- "Telnet" application via "Atari Inside 052" cover disk, loaded from a Gotek floppy emulator

So far I could not find a better solution, so if anyone has anything better to do this with the following configuration, I am completely open to suggestions. Otherwise, it technically works! (I still have to work on fiddling with the settings, as for some telnet BBSes so far when I try to type, the system ends up sending double/triple/quadruple commands, so "phalkon13" becomes "pphhaallkkkoonn111133".

I thought this would be an easy-to-find answer but I've had no luck.

The BBS I want to run requires MSDOS and won't run on Windows 10.

So I run it in a VM.

However, I'd like people to ssh/telnet to it because I don't want to set up modems.

I need some sort of shim running on Windows 10 that will listen for ssh/telnet connections from the Internet and connect them in a bidirectional way with the COM ports on the virtual machine so the remote users look as if they are connecting to the BBS via the COM ports, even though they used TCP/IP to connect to the host machine.

Ideally, the first person to ssh/telnet in would go to a COM1, the second would go to COM2, the third to COM3, and so on so they appear to be multiple modems.

Maybe there's a VM where the COM ports look like TCP/IP ports from outside the VM but like COM ports inside the VM?

Thanks very much in advance!!!

Hi everyone I am doing some routine stuff and notice that port 21 (ftp) is open on my router.

I enabled telnet on my pc and tried to telnet using my public IP. I got a response that connection failed.

Does this mean the routers firewall is blocking the telnet request?

I forgot to check if telnet is enabled and set the ssh server port to 23 and now I can't connect to the sevrer with neither telnet nor ssh because they just clash with each other. Is there a way to unbrick it without reinstalling linux?

EDIT: managed to unbrick it by connecting a monitor and keyboard because apparently I installed an x server on it at some point, not that the x server matters, I just found a VGA monitor I didn't know I had

Hello, I recently posted asking about setting up a 56K Dial Up NAS with some old Cisco gear and Digital Modems. I've now got it working (although there's probably some still tweaking to do) with the help of DrDeke

The next thing I'd like to play with is running a BBS with several lines. I'd rather avoid having a stack of modems, so if I can utilise Cisco hardware (Either the NM-30DM Digital Modem or a NM-8AM-V2) that would be ideal.

Is it possible for an inbound dial in async connection to automatically telnet out to another service and bridge the two? I'm not talking ppp here, just a transparent connection.

If that's not possible, is it possible to bridge two lines on the router? E.G Dial In Asnc is bridged transparently to another async port on the router?

Apologies if I've got some of the terminology wrong, I'm new to this (old) technology.

Thanks!

Hi,

A cluster of kubernetes is up, where the network is controlled by the Calico. A deployment has been created where telnet is used to connect to a third-party server (outside of the cluster). Connection attempts are leaving the cluster, but there is no incoming connection to pod itself.

tcpdump:

192.168.44.93.39750 > 192.168.56.21.1521: Flags [S], cksum 0xaeb0 (incorrect -> 0x25fc), seq 1301555203, win 64860, options [mss 1410,sackOK,TS val 947660556 ecr 0,nop,wscale 7], length 0

11:13:30.403393 IP (tos 0x0, ttl 63, id 34819, offset 0, flags [DF], proto TCP (6), length 60)

192.168.44.93.39750 > 192.168.56.21.1521: Flags [S], cksum 0xaeb0 (incorrect -> 0x25fc), seq 1301555203, win 64860, options [mss 1410,sackOK,TS val 947660556 ecr 0,nop,wscale 7], length 0

11:13:31.415006 IP (tos 0x0, ttl 64, id 34820, offset 0, flags [DF], proto TCP (6), length 60)

192.168.44.93.39750 > 192.168.56.21.1521: Flags [S], cksum 0xaeb0 (incorrect -> 0x2209), seq 1301555203, win 64860, options [mss 1410,sackOK,TS val 947661567 ecr 0,nop,wscale 7], length 0

11:13:31.415077 IP (tos 0x0, ttl 63, id 34820, offset 0, flags [DF], proto TCP (6), length 60)

Yaml file:

---

apiVersion: v1

kind: Namespace

metadata:

creationTimestamp: null

name: sms-service

spec: {}

status: {}

---

apiVersion: apps/v1

kind: Deployment

metadata:

creationTimestamp: null

name: sms-service

namespace: sms-service

spec:

replicas: 3

selector:

matchLabels:

app: sms-service-pod

strategy: {}

template:

metadata:

creationTimestamp: null

labels:

app: sms-service-pod

spec:

containers:

- image: donch/net-tools

name: sms-service

imagePullPolicy: Always

resources: {}

command: [ "/bin/sh", "-c", "--" ]

args: [ "while true; do sleep 30; done;" ]

status: {}

What's happening and how I can fix this?

Hello all,

Just started working with Hack The Box and I am really enjoying the experience. However, I am encountering an issue with one of the Starter Boxes called 'Meow'. I am able to enumerate the target system and Telnet shows up as an open port. When attempting to use Telnet, I am given an error stating Telnet is an unknown command. Based on this I attempted to install Telnet onto the PwnBox yet more errors occurred.

Checking the Walkthrough simply shows the user accessing Telnet and the target machine without any issue, so I am quite confused as to what I am doing wrong here. There is no mention in the Walkthrough of this particular issue as far as I know, and multiple forum searches have not yielded any further answers.

Any chance I could get some guidance on this issue? Am I encountering a bug or have I completely misunderstood what needs to be done with the box?

My apologies for such a basic question! Thank you in advance!

I've been playing around with my Rak V2 while I wait for it to finish Syncing. I read a post where you could remotely telnet into your miner to see if it was actually online or not. I tried using JuiceSSH, and it worked:

Trying 192.168.0.999... Connected to 192.168.0.999. Escape character is '^]'. /multistream/1.0.0

So that's cool... But is there anything else you can do besides connect? Any commands you can run from the telnet prompt?

Hello I’ve have been doing some enumeration on my target in this room and I was supposed to find the port that Telnet is running on I tried all sorts of commands but it didn’t show me any ports I used this command “.

nmap <ip> -A -vv.

and few other but it just isn’t working, what am I doing wrong?

Hi! Alright? Sorry for any spelling errors, I'm using Translator :(. I have access to my router via Winbox and HTTPS page (WebFig), this access via web page is protected with Cloudflare Proxy, with it, I can hide the IP address and allow only clients from my country to access the page. In the Firewall, for port 443, only the proxy can access, being the only way to access the page. Still, on the RouterOS proprietary login screen, there is a Telnet icon, which shows my real IPv6 address My question is, can I edit the main WebFig login page and remove the "telnet" icon to hide my IP address perfectly this way?

I’m studying for my CCNA and going over ports. I understand subjects better when I know their practical use. If telnet is not secure and SSH is why wouldn’t I just always use SSH to remote into a device?

I'd really like to use an old 8bit computer to connect to the telnet server in KOS. I already have a serial connection between them which I use to move disk images from my Winbox to it, and I have terminal emulation software for the old computer.

Would I be able to put "com1" in the KOS IP address box or would that not work?

Hey guys, this very well may not be the right place for this question, but I didn't know where else to ask so sorry in advance if it isn't.

I am trying to show one of my friends the beauty that is the ASCII star wars movie through telnet, but when she tried to run it, the connection timed out. I thought they might just be doing something wrong since I was typing instructions via text, so I tried it myself and the same thing happened. Does this still work for anyone else or has it finally been shut down?

Hello all, I'm not sure if I'm just missing something here but I’m using the router on a stick inter-vlan routing method with a simple topology consisting of 2 PCs (2 subnets), 1 switch, and 1 router. I've configured the two Vlans and two sub interfaces properly and they’re pinging successfully however I'm having trouble setting up the management vlan. I’m trying to create and use vlan 99 as the Telnet with ssh on the switch.

For the SVI I’ve created the vlan 99, applied the ip address/subnet mask, and applied the default gateway to the switch.

For telnet/ssh I’ve Configured ip domain, generated rsa key pairs, configured user authentication, and configured vty lines on the switch.

Am I missing something or are there more steps? Would really appreciate any guidance or assistance! I’m pretty confused.

Welcome back to IT Pro Tuesday!

We're looking for your favorite tips and tools we can share with the community... those that help you do your job better and more easily. Please reply or leave a comment with your suggestions, and we'll be featuring them in the coming weeks.

And as always, we’re updating the full list on our website here. Enjoy.

But on with this week's tools...! Here are the most-interesting items that have come across our desks, laptops and phones this week. Hornetsecurity has no known affiliation with any of these unless we explicitly state otherwise.

A Script

[PowerShell] Advanced HTML reporting explains how you can use some simple scripting to create feature-rich reports you can share. Author MadBoyEvo clarifies, "While it says in the title Advanced HTML reporting, it's actually advanced in terms of what you can achieve, but not complicated to use."

A Tip

Some sage career advice for the junior sysadmin, compliments of cliffhnz: "Never EVER be afraid to ask! That’s how you learn! Maybe they are doing [whatever you are wondering about] purely out of habit and shouldn’t. Maybe they have found that after following all instruction from the maker of the software… for now, this is the “easiest way” to get things done. Be curious. Ask away. This is what gets a junior up to a senior level, gaining knowledge."

A Free eBook

A SysAdmin Guide to Azure IaaS – 2nd Edition is a free 100+ page guide from Altaro that teaches how to set up and maintain a high-performing Azure IaaS environment. Covers the whys and hows of VM sizing and deployment, migration, storage & networking, security & identity, infrastructure as code, backup & replication, Azure Active Directory, Azure Arc, Automanage and more.

A Tutorial

What is Reverse Telnet and how do I configure it? is a helpful post that explains how to telnet to a device and then console to another device from there so you can remotel

Just a few free tools, resources etc. that can make your tech life a little nicer.

But without further ado, here's the list… I have no known association with any of these unless stated otherwise.

A Script

[PowerShell] Advanced HTML reporting explains how you can use some simple scripting to create feature-rich reports you can share. Author MadBoyEvo clarifies, "While it says in the title Advanced HTML reporting, it's actually advanced in terms of what you can achieve, but not complicated to use."

A Tip

Some sage career advice for the junior sysadmin, compliments of cliffhnz: "Never EVER be afraid to ask! That’s how you learn! Maybe they are doing [whatever you are wondering about] purely out of habit and shouldn’t. Maybe they have found that after following all instruction from the maker of the software… for now, this is the “easiest way” to get things done. Be curious. Ask away. This is what gets a junior up to a senior level, gaining knowledge."

A Free eBook

A SysAdmin Guide to Azure IaaS – 2nd Edition is a free 100+ page guide from Altaro that teaches how to set up and maintain a high-performing Azure IaaS environment. Covers the whys and hows of VM sizing and deployment, migration, storage & networking, security & identity, infrastructure as code, backup & replication, Azure Active Directory, Azure Arc, Automanage and more.

A Tutorial

What is Reverse Telnet and how do I configure it? is a helpful post that explains how to telnet to a device and then console to another device from there so you can remotely recover a device that loses network access because of a boot failure or config error—without an expensive console server at each remote site. crznet66 shares, "I do this all the time… Ensure you set an ACL on your AUX line too, as it would be reachable once enabled."

Another Tip

itdumbass offers a clever metaphor to explain the impact of latency to a non-technical individual: *"A man got a job painting the white lines down the middle of a highway. On his first day he painted 10 miles; the next day six