virtualhost – Something wrong with configuring apache for it to serve as a virtual host in a local domain on a local network

I'm using Apache 2.4.29 on Ubuntu 18. With a default domain, Apache was working fine, but I'm trying to configure additional subdomains. Here is my virtual host configuration:

adam@gondolin:~$ cat /etc/apache2/sites-available/edoras_mysql.conf


    ServerName edoras_mysql.gondolin.localdomain
    ServerAdmin webmaster@localhost
    DocumentRoot "/var/www/edoras_mysql"

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined


The default conf is unchanged.

I ran a2ensite edoras_mysql and he did not complain, and restarted the Apache demon, but browsing the site results in:

We can’t connect to the server at edoras_mysql.gondolin.localdomain.

of the same machine. Navigation gondolin.localdomain although it works.

That's my /etc/hosts:

adam@gondolin:~$ cat /etc/hosts
127.0.0.1   localhost localhost.localdomain gondolin
127.0.1.1   gondolin
192.168.0.3     gondolin.localdomain gondolin

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

If I did something wrong, I do not see it. That's what I should have after all that I've read on the net.

I use this gondolin host as a DHCP server and DNS, and gateway with iptables that works fine, so I do not see any problems with that.

network – The connection is established on one IP but not on another on the same host / nic

I am debugging a problem where some http requests take longer at random than usual. (Normal being a few ms, abnormally 1000 ms up to a minute or more)

The host has multiple IP addresses and the service it is working with is proxied by nginx on two of these IP addresses.

If I send requests to the first IP address, everything works as expected and all requests are fast.
If I send requests to the second IP address, some requests take several seconds or more randomly.

Both IPs are on the same nic:

2: eth0:  mtu 1500 qdisc mq      master bond0 state UP group default qlen 1000
link/ether 00:0c:29:5e:47:7d brd ff:ff:ff:ff:ff:ff
3: bond0:  mtu 1500 qdisc noqueue state UP group default 
link/ether 00:0c:29:5e:47:7d brd ff:ff:ff:ff:ff:ff
inet 192.168.10.73/24 brd 192.168.10.255 scope global bond0
   valid_lft forever preferred_lft forever
inet 192.168.10.72/32 scope global bond0
   valid_lft forever preferred_lft forever
inet 192.168.10.75/32 scope global bond0
   valid_lft forever preferred_lft forever
inet 192.168.10.76/32 scope global bond0
   valid_lft forever preferred_lft forever
inet 192.168.10.54/32 scope global bond0
   valid_lft forever preferred_lft forever

So, for example:

curl -H "Host: xxx" http://192.168.10.54/test

will be randomly slow, while

curl -H "Host: xxx" http://192.168.10.75/test

is always fast.

Both IP addresses are serviced by the same nginx server block:

server {
        listen 192.168.10.75:6700;
        listen 192.168.10.54:6700;

        location / {
                proxy_pass http://...;
        }
}

I've checked the open ports, but it's only a few hundred connections on each IP.

This is under Linux (3.16.0-8-amd64 # 1 Debian SMP 3.16.64-2 (2019-04-01) x86_64 GNU / Linux)

I do not have any iptable rules

I am not sure how to proceed with the debugging and I would appreciate all the tricks 🙂

Concrete questions:

  • What settings can be different at the IP level on the same link that I could check
  • What indicators can I check to give me clues about the cause

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Varnish Web site with authentication returning 200 when the host header is set to "#"

So I'm testing a website that runs on Varnish and has HTTP authentication. Generally, if you try to visit the site, it will ask you for a username and password. If you enter it incorrectly / close the prompt, you get a 401 response. However, if you change the request's host header to an invalid site, you receive a 500 response. with a quick error for the unknown domain. All this makes sense and seems to work normally.

However, if you set the host header to a pound sign "#", an ampersand, or a slash, the site returns a 200 with a length of content equal to zero in the response, even if you request an existing page on the server. . Why can this happen and are there methods to exploit it?

Edit: I've also noticed that this increases the response time from 20-50 ms to over 1000 ms if it's useful.

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networking – Direct connection to WSL with SSH from another host

Can you connect from a host (linux) directly into a windows-wsl-ssh? without connecting to windows first? Like, change the wsl port under linux and connect to this port instead? What should I change for that? On the Internet, I can only find solutions for connecting to WSL from the Windows host via 127.0.0.1, and I have to log in from another host.

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dns – cname usage methodology to check domain ownership for use with a host

Web hosting services, such as Squarespace, allow customers to connect their third-party hosted domains to their site without transferring ownership or changing name servers. This is achieved by adding specific records to the DNS configuration of the domain itself. This is what Squarespace requires:

HOST            RECORD    VALUE
9aa5s43zpykpn   cname     verify.squarespace.com
www             cname     ext-cust.squarespace.com
@               a         192.49.23.144
@               a         192.185.159.145
@               a         192.185.159.144
@               a         192.49.23.145

Presumably, when the domain is visited, the A record connects to the appropriate server which, with the help of the CNAME registry verify.squarespace.com, discerns and directs the request to the appropriate content in function of the unique identifier stored in the host (9aa5s43zpykpn).

Is this really how it works and why?

Is verify.squarespace.com queried as part of DNS resolution? (before the squarespace servers receive the request via the A record)

Are there other objectives at work here for this type of installation?

Why the need for registration www?

More importantly, what Squarespace technique would it use to actually display the CNAME record for verification purposes? In other words, is there an appropriate DNS record for this purpose, or should the server identify the incoming host (domain), match it, and look for the associated hash (9aa5s43zpykpn) in a database, then use a tool such as dig check that the cname registration exists?

Insight appreciated.

metasploit – Proxy chains to access ports on the same host

It may be an amazing stupid question but I need to know if this concept is even possible.

I got a low privilege shell on a target machine. After an enumeration, I know that the host is vulnerable to EternalBlue but port 445 is blocked by firewall restrictions.

Is it possible to transfer port 445 to my machine as a low privileged user? As can be seen in the screen shot below, I used the MSF socks4a module in combination with the proxy chains, but my probes were denied.

screen capture

I've also tried using the MSF portfwd module which for some reason did not stop killing my meter-meter sessions as soon as I connected to the local port.

Could someone please clarify this for me?

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I want to use lambda to speed up and process if necessary. How can I get there, how can I start?