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Thread: Question about gdm tcp sockets

  1. #1
    Join Date
    2018-Jan
    Posts
    10

    Question Question about gdm tcp sockets

    Hi,

    I've noticed that gdm has a listening tcp and tcp6 sockets on random ports. Application which is opening them is gnome-session. I understand that gnome needs to use sockets in order to work but why are they tcp and tcp6? They probably there for remote access, is it possible to switch them off?

    Code:
    # netstat -tulpan
    Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
    tcp        0      0 0.0.0.0:40569           0.0.0.0:*               LISTEN      1038/gnome-session- 
    tcp        0      0 0.0.0.0:45603           0.0.0.0:*               LISTEN      1373/gnome-session- 
    tcp6       0      0 :::44501                :::*                    LISTEN      1038/gnome-session- 
    tcp6       0      0 :::41849                :::*                    LISTEN      1373/gnome-session- 
    udp        0      0 0.0.0.0:68              0.0.0.0:*                           1096/dhclient
    
    # lsof -Pnl +M -i4 -i6
    COMMAND    PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
    gnome-ses 1038      131   11u  IPv6  12625      0t0  TCP *:44501 (LISTEN)
    gnome-ses 1038      131   12u  IPv4  12626      0t0  TCP *:40569 (LISTEN)
    dhclient  1096        0    6u  IPv4  19931      0t0  UDP *:68 
    gnome-ses 1373     1000   11u  IPv6  26079      0t0  TCP *:41849 (LISTEN)
    gnome-ses 1373     1000   12u  IPv4  26080      0t0  TCP *:45603 (LISTEN)
    Kali version 4.14 and 4.15

    I also have a live USB with kali a bit older version 4.13 and I don't see any open tcp connection from gdm.

    I tried to disable tcp in /etc/gdm3/daemon.conf
    DisallowTCP=true
    but it doesn't work.

  2. #2
    Join Date
    2018-Apr
    Posts
    1
    I also noticed the ports change from time to time. Makes me slightly uncomfortable.

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