Questions tagged [tunneling]
tunneling refers to a mechanism in which one network protocol encapsulates a different payload protocol.
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OpenVPN Access Server - Split tunnel to selected users [migrated]
Not sure if this is the right platform to ask. Here is my question:
I have OpenVPN Access Server 2.6.1 currently configured with split tunnelling and its working fine. I have two VPN users, X and Y. ...
2
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0answers
38 views
Split tunneling to speed up Windows update
We have almost 10 years worth of Win7 updates that need to be done and the amount of bandwith can't be handled by our VPN. Are the security risks of enabling split-tunnel a lot smaller when its just ...
1
vote
1answer
46 views
Why is GRE tunneling is needed when having a BGP based solution against DDoS?
I understand that GRE tunneling is very handy when sending the data back to the client after scrubbing because it's designed to ensure that the data is sent reliably by initiating a private point-to-...
0
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1answer
128 views
how to force openvpn client to use TLS instead of SSL connection [duplicate]
i'm trying to use openvpn client to connect TLS VPN server
here is my .ovpn file
client
tls-client
dev tun
proto tcp
remote example.com 443
resolv-retry infinite
auth-user-pass
persist-key
...
2
votes
1answer
59 views
What's the difference between SSH tunneling and login into the same SSH server and executing commands?
Consider these 2 scenarios.
(1)
Let's say I login into an SSH server named A normally using
ssh [username] @ [IP address of A].
And now I connected to another server named B which is accepting ...
0
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1answer
237 views
What's the security concern of browsers using the HTTP CONNECT method?
The XMLHttpRequest spec says that attempted usage of the CONNECT method should throw a security error.
Is there a security issue with client-side JavaScript sending CONNECT requests to servers? It ...
0
votes
1answer
170 views
Deanonimizing VPN/tor traffic [duplicate]
What a VPN does is take the encrypted traffic from the client, decrypt it and forward it to the server, while tor bounces the traffic in multiple nodes decrypting a layer at each node.
I have some ...
0
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1answer
179 views
Problems with getting reverse shell
I got a badUsb, my current solution is: it downloads netcat.exe and establishes a netcat connection between test-box and me with the help of localxpose tunneling (when I'm not in the same network).
...
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1answer
243 views
VPN vs SSH tunnelling for hotel wifi
I know it's recommended to use a VPN with a hotel WiFi but if I'm in a hurry and don't have time to setup my own VPN server would an SSH tunnel (invoked with ssh -D) work just as well to secure my web ...
23
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2answers
4k views
Is telnet secure through SSH tunneling
Firstly sorry, maybe dumb question, but I have one service running on my server which can be operated only by telnet (port 23), but I know that telnet is insecure, so I blocked port 23 in iptables ...
2
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1answer
98 views
Is the same key used for Authorization and Encryption? (SSH Tunnel)
I am a bit confused on how SSH encryption works.
From reading this question, I see you can use a private key to authenticate with the -i flag.
I also know think that SSH encrypts data using ...
2
votes
1answer
950 views
Tunnel ssh over http with custom headers
I'm trying to set up corkscrew to make an SSH tunnel over HTTP, but I need to add custom headers after the "CONNECT" statement and before the ssh tunnel.
Does corkscrew support it? If yes, how can I ...
2
votes
1answer
382 views
How to obfuscate SSH tunnel Mac?
I am looking to test a DPI (deep packet inspector). I currently have it set up to block SSH connections (which it does successfully).
I have learned that DPI can be bypassed by obfuscating/encrypting ...
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3answers
1k views
Are there any feasible ways to block the stunnel utility at the network level?
The stunnel utility written by Michał Trojnara allows, if I understand correctly, to "wrap" non-SSL protocols (such as ssh) in an SSL connection.
For example, imagine that all network ports on a ...
2
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0answers
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Tunneling SSH over Shadowsocks
This post on unix.se explains how to tunnel SSH over shadowsocks.
This post on sec.se discusses some of the vulnerabilities of shadowsocks (namely its vulnerability to brute force).
After reading ...
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1answer
374 views
tunnelling HTTP request through DMZ from a secured area
In my topology I have a secured area where all the servers are. There is also a DMZ with a few reverse proxy servers. I now need to make one of the servers in the secure area open to make HTTP calls ...
0
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1answer
53 views
Negative consequences of forced encryption of unencrypted secvices
Are there any negative consequences to encrypting an unencrypted service/protocol like FTP, VNC, telnet, and so on by using forced encryption like ssh tunneling or OpenVPN tunnels?
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1answer
381 views
In DNS Tunneling, What's the DNS Response packet size?
In DNS Tunneling server use RR (CNAME, TXT, NULL) to send back data to the client. My question is what's the size of response packet and how much data can be sent using DNS response in DNS Tunnel ?
4
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1answer
555 views
Trying to tunnel a reverse shell out of an internal network
I am practicing performing a pentest and getting stuck trying to get an interactive reverse shell from an internal machine to my attacker machine.
This is what I have done so far:
Me(attacker): 67....
3
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1answer
572 views
Pivoting with Metasploit
I am trying to exploit a Windows VM on a different subnet behind a dual home Linux VM where I already have a shell. To keep it simple, I have a meterpreter reverse_tcp shell on the Linux VM (192.168....
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2answers
1k views
VPN tunneling, routing and sniffing
I did not understand some things regarding the VPN.
How is the VPN tunnel established? My computer and the end VPN server need to exchange some info to establish a tunnel? (some kind of handshake or ...
6
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1answer
888 views
DNS Tunneling - Mitigation
I believe the root cause for DNS tunneling is because the internal hosts are allowed to do recursive queries of external domains. For DNS tunneling to work, an internal host should be able to send ...
4
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1answer
1k views
Is it sensible to tunnel TLS traffic over another TLS?
I'd like to secure my application's traffic using TLS with pre-distributed self-signed certificates (as a drop-in replacement of plain TCP).
In some cases, two clients won't be able to talk to each ...
1
vote
1answer
213 views
VPN and SSH overseas
I stopped penetration testing and studying network security, for the most part, when the "NSA Playset" was released years ago. Thus, I have an IT question to impose upon you.
I will be traveling ...
4
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2answers
567 views
Can a Government block a specific app traffic, even with a VPN running?
A few minutes ago, there was a terror attack on a nightclub in Istanbul/Turkey(Thoughts and prayers to the victims and families), usually, the Government limits most of the communications apps traffic ...
0
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1answer
338 views
How to ensure if an SSH tunnling failed (if I haven't really tunneled)
I tunneled data transition as 22-22 and 2222-80, between my PC and VPS:
ssh user@1.1.1.1 -L 22:localhost:22 -L 2222:localhost:80 -i ~/.ssh/key
To make sure both tunnels were created, I executed lsof ...
1
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1answer
68 views
How to make sure the data is indeed tunneled?
I am not of the IS field so sorry if anything I write here seems pathetic.
Background for this question:
I login to my server with the following command. The second -L porition is to encrypt data ...
1
vote
4answers
342 views
How could I tunnel all actions I do in my VPS from my browser (like PHPmyadmin actions)?
I am not of the field of information security so sorry if something I wrote below seems pathetic to you.
I am to defend my server's DB and for that I filtered port 3306 with CSF-LFD and now control ...
0
votes
2answers
271 views
Why can hackers get in network using tunneling? [closed]
I can't hack but I like to read about it. From my readings (securityfocus, exploit-db, owasp, etc...) it appears that hackers can actually get in a network using tunneling ; I'm not from a network ...
2
votes
1answer
1k views
Does a Server connecting to port 3544 pose an increased risk
I had look at the firewall logs and i can see my production server connects to microsoft (13.92.90.48) on UDP port 3544. A quick reading suggests this is to do with Teredo tunneling (IPV6 translation ...
2
votes
1answer
599 views
Does AH in tunneling mode provide encryption?
I've been reading on IP sec for a few days, and i have some confusion on the differences between AH and ESP in tunnel/transport mode. I understand that AH only provides authentication and integrity ...
3
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2answers
90 views
Security concerns with external MySQL access using tunnelling
I have gotten my personal vServer with a standard installation of Ubuntu Server 16.04 and I wanted to install and configure a MySQL server on it. I was considering to disable direct external access, ...
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2answers
472 views
Authentication helpers for tunneling through an HTTP proxy?
corkscrew is quite good for tunning SSH through an HTTP proxy. However, it only supports basic authentication. Have other people developed similar software supporting other types of authentications? ...
2
votes
1answer
156 views
Tunneling over a HTTP subfolder?
I have a firewall, which only forwards HTTP requests, and only if the request is pointing to something in a /admin/ folder, so it only lets through requests like this:
http://www.anysite.com/admin/...
0
votes
3answers
74 views
Webserver port tunneling security - security options
I'm developing system that allows access to client devices behind firewall, using port tunneling via SSH. Every client has dedicated linux based server, with port 80 being tunneled to public server. ...
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0answers
66 views
Tunnel after authentication is complete with EAP-TTLS or PEAP
After authentication is complete with EAP-TLS, EAP-TTLS or PEAP, what happens to the tunnel?
Is it collapsed?
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1answer
492 views
Detecting DNS tunneling
I have been trying to detect/establish DNS tunneling. First of all I logged out of my user account of the captive portal. Findings:
$ nslookup <somesite> // works fine
$ ping <somesite> //...
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2answers
595 views
Are VPN tunnels really completely private? [duplicate]
I've been considering a VPN tunnel, specifically PIA.
These types of companies make bold claims of complete anonymity and privacy, with no one in the world (ISP's, governments, school or corporate ...
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0answers
2k views
Can SSH tunneling over DNS tunnel work in China to use free WiFi at airport?
I have followed a tutorial here: http://ebnj.net/sshoverdns/
This tutorial tells us how to carry all internet traffic via DNS tunnel if your airport enables no-limit outgoing DNS.
This guides us to ...
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2answers
916 views
SSH Tunnels for Securing IoT Sensor-to-Server Connections (Many to One)
All,
How bad (or good) an idea would it be to utilize SSH tunnels from my sensor gathering remote computers (imagine an "industrial" Raspberry Pi-like device w/ Linux) to my centralized server (also ...
2
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1answer
2k views
X windows security: VNC and X server vs xpra
I have a CentOS server that currently has no X server on it. It will be used for doing statistical crunching and providing other services (probably via a web interface). The main security for the ...
3
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4answers
3k views
How to know if accessing to a VPN service is safe and won't steal my data
I want to know if a VPN service is safe or not. If the VPN server itself can catch or sneak peek my data? Or as long as it is a VPN service, then the security is protected by the algorithm itself?
...
2
votes
1answer
593 views
Captive portal DNS tunneling
I recently had a meeting with a security researcher who told me about tunnelling over a captive portal using DNS.
I have done some research into this but I was wondering what is the simplest way to ...
1
vote
1answer
193 views
How would a SSL tunnel be exploited?
I am looking at our CI (Bamboo) Server initiating an outbound connection to setup a SSL tunnel to an agent running on an AWS ec2 instance. As per the documentation:
All traffic sent between the ...
0
votes
1answer
1k views
Transfer of packets in a VPN connection
I am trying to figure out how a computer communicates with a website when using a VPN connection (specifically, how packets are transferred) as compared to a computer that's not using a VPN connection....
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0answers
71 views
TLS in slow/unstable mobile/wireless networks [closed]
We have this rather old VPN tunnel software that is running in various wireless/mobile networks (from 2G mobile and upwards). It is currently running WTLS, as this software is from the old days when ...
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1answer
173 views
when router get's ipsec packet does it look into crypto map acl
So I have a question about IPSec.
For example, we have an extended ACL with one line 10.10.10.0/24 10.20.20.0/24 on one side (R1)
and 10.20.20.0/24 10.10.10.0/24 on the other (R2).
When we see ...
12
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1answer
2k views
Does a VPN provide any security benefits over sshuttle or a vanilla ssh tunnel?
I use sshuttle to tunnel my traffic through one of my remote boxes whenever I'm in a cafe or connected to an insecure network.
Does a VPN provide any additional security benefit over this kind of ...
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votes
6answers
10k views
How does a network admin block the reverse SSH in company?
Given firewall
inbound: all are blocked
outbound: allow port 80, 443
Problem
colleagues are still able to ssh to home device by port 80/443, and establish a reverse ssh tunnel from company to home, ...
5
votes
1answer
1k views
How should I tunnel arbitrary protocol traffic over HTTPS?
I'm posting this question from a moving train! (Ok, maybe that's not so impressive.) This train has an annoying WiFi - it's low-throughput, high-latency, tends to lose packets, and blocks most kinds ...
