SSH (Secure shell) is a protocol for secure communication between computers to execute remote commands, transfer data and tunnel TCP connections.

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7
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2answers
81 views

What could cause “Bad packet length” with sshd?

I am getting a lot of failed ssh login attempts by one specific IP-Address with a strange error. I cannot make sense of the information found through google, so I was thinking it is maybe a new form ...
5
votes
1answer
131 views

System breach or OpenSSH glitch?

The system runs a SSH daemon, and a nginx web server, both ports being open to the internet. We are part of a university so our ports are forwarded from the main router to the intranet. At about 19:...
4
votes
1answer
211 views

Does RekeyLimit property in sshd_config enforce re-keying / key re-exchange?

I have set the RekeyLimit property in sshd_config and tried to perform a SSH. However, I could not see rekeying happening in the verbose logs, all I see is the log message below at the start of the ...
3
votes
1answer
190 views

Why does the server ssh public key not look like the key in client known hosts?

From my naive understanding of ssh, the server shares its public key ( /etc/shh/ssh_host_rsa_key.pub ) with the client, who then adds it to the list of known hosts ( /user/.ssh/known_hosts ). So, I ...
2
votes
1answer
241 views

There might be a man in the middle attack against my server

I have a little $7.20/y VPS, and the fingerprint for the ECDSA key has changed three times on me. This time, it happened shortly after I reinstalled the server (same day, in fact.) I always disable ...
2
votes
1answer
47 views

Can a user verify the quality/safety of pregenerated SSH moduli parameters?

Many tutorials about how to mitigate the Logjam recommend regenerating Diffie-Hellman moduli. This is a resource intensive operation, especially for high-bit groups. This made me think if it made ...
0
votes
1answer
80 views

Robots trying to login to Azure VM when SSH port is closed in manager

I have many robots trying to do SSH login in a Azure VM. In the resource manager SSH is disabled but attacker IPs are public, as you can see below, where I copy a log for auth.log (I have an Ubuntu ...
2
votes
0answers
749 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 ...
2
votes
0answers
52 views

Wayland Partial Encryption for Mouse / Keyboard? (Also X and RDP)

Question What are the best practices for implementing Partial Encryption, to encrypt just the input devices (mouse/keyboard, etc), not the actual video display, during remote desktop sessions using X,...
2
votes
0answers
196 views

Why my proxy is still having some connections blocked

I am behind a firewall in France. I connect to proxy A, in Ireland with Dante via SSH port 22 and make a tunnel forwarding port 1080. The proxy works as expected but still having a port range blocked....
1
vote
0answers
28 views

Enabling specific access with iptables on Debian

I am running a Debian server that hosts several Docker containers but also works as my router and internet gateway. I am having trouble getting SSH access from outside (specific ipaddresses) working ...
1
vote
0answers
27 views

SSH certfificates generated on server user-creation + login scheme secure?

I'm sketching on a way to harden and automate server login using ssh-keygen with certificates where certificates, valid for e.g. 1 week, are generated on a trusted server and can be used to both ...
1
vote
0answers
49 views

find owner of private key

On one of the old dev servers I manage there is an RSA public and private key pair ~/.ssh/id_rsa.pub and ~/.ssh/id_rsa in a staging user account (used for automation and testing prior to production)...
1
vote
0answers
93 views

Tunneling rdp over ssh as a network newbie

For whatever reason I need to access a virtual machine (Windows server 2008r2) on my home network from outside the network over the internet via remote desktop. I read that there are "concerns" with ...
1
vote
0answers
106 views

SSH intrusion suspected: Logwatch report versus SSH log file entries

My Web server's Logwatch report shows ssh and su activity that should not be there: sshd: Sessions Opened: deployer: 45 Time(s) su: Sessions Opened: root -> deployer: 8 Time(s) ...
1
vote
0answers
110 views

Programmatically open router ports via port triggering

I'm getting many brute force attacks on my home computer which is behind a DSL modem (very old D-Link, has only web interface), so I decided to protect SSH this way: Every time I want an SSH ...
1
vote
0answers
283 views

Logging all traffic crossing SSH proxy

Is there a way to log SSH sessions proxied through a machine (User-> SSH Proxy -> Server (with SSH)) without modifying the SSH daemon on the proxy? I need to log all the commands as well as responses ...
1
vote
0answers
93 views

Find the location of a hidden host

I'm doing a penetration test for a client who wants me to try and target a specific server. I have managed to get credentials(hard-coded in an in-house app) to a limited account on this server that ...
1
vote
0answers
94 views

Pwn Plug like tunneling suite

Is there some sort of a (free) SSH tunneling suite like the one on the Pwnie Express' Pwn Plug (R2)? It has SSH over HTTP, DNS, ICMP, and other covert tunneling options and uses BackTrack 5 as a SSH ...
1
vote
0answers
283 views

SSH using pre-existing session (symmetric) keys

Is there at present a way to open a SSH connection using pre-existing symmetric session keys? In other words, if I create a list of symmetric keys can I send that list to the recipient on a CD or USB ...
1
vote
0answers
97 views

Central Authentication Server

I have many client devices that I need to reverse SSH tunnel into. I am finding that managing all these certificate files are becoming cumbersome. I am looking into a centralized authentication system....
1
vote
0answers
104 views

Considerations when implementing a key based SSH-like auth scheme

I have a SMTP server where all the users (for an unrelated reason) will have public keys tied to their username and registered with the server. I want to add a non-standard extension that uses these ...
1
vote
0answers
188 views

Test S/KEY support for PCI compliance - CVE-2007-2243

In order for our business to be PCI compliant, we need to prove that we are not vulnerable to CVE-2007-2243. This states that: OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is ...
0
votes
0answers
13 views

Attacker's Potential Scope of Dmg if He/She can SSH into Android Phone

I've recently started researching the ability to SSH into an Android device. From what I've seen, this is a figured out challenge, which makes me wonder how much damage an attacker could do. Let's ...
0
votes
0answers
35 views

What can possibly happen to a public SSH server?

I'm writing a console emulator in JQuery, which will connect to a server through SSH and dynamically send commands (through AJAX) and receive output. Basically it will be a remote ssh console on a ...
0
votes
0answers
47 views

Can I use process crash information to detect buffer overflow attacks?

Buffer overflow is a very common vulnerability, often targeted with zero-day exploits. Successful attacks often result in arbitrary code execution, while failed attempts tend to crash the target ...
0
votes
0answers
40 views

On the Import Client Key screen in Bitvise what is numeric field just next to the Location Profile dropdown?

What is this field for? I know I saved a profile in the beginning, and I want this private key to be attached to just the profile that I'm using, but what on earth is that numeric field for?
0
votes
0answers
54 views

Is CurveZMQ Mature Enough to be Trusted?

We're using ZMQ for our projects and are now looking at extending usage to traverse a LAN. We'd like to implement security as this LAN could potentially have hostile parties. I'm leaning towards ...
0
votes
0answers
81 views

SSH attempt blocked now ECDSA keys changed

Last night I had an external IP tried to access my server over SSH. The attempt was blocked as it failed to authorise in the number of times and time limit that I'd specified. Doing a whois on the ip ...
0
votes
0answers
71 views

Silent security on android

I saw a DEFCON talk about owning back a stolen PC/Mac, with a SSHd daemon and a dynamic-ip service installed,running in background. I was wondering if is it possible to achieve tha same results on an ...
-3
votes
0answers
72 views

Alternate SSH authenticate

I was doing a little bit of research on how SSH actually authenticates a user and different things. And I came across a document which nicely explains how SSH authentication works which is something ...