OpenSSH Security Advisory (adv.fwd)

Hostile servers can force OpenSSH clients to do agent or X11 forwarding 1. Systems affected: All versions of OpenSSH prior to 2.3.0 are affected. 2. Description: If agent or X11 forwarding is disabled in the ssh client configuration, the client does not request these features during session setup...

X Server Detection

The remote host is running an X11 server. X11 is a client-server protocol that can be used to display graphical applications running on a given host on a remote client. Since the X11 traffic is not ciphered, it is possible for an attacker to eavesdrop on the connection. C Tenable Network Security...

Solaris 7.0/8 - Xsun Buffer Overrun

// source: https://www.securityfocus.com/bid/1140/info A buffer overrun vulnerability exists in the Xsun X11 server, as shipped as part of Solaris 7 and 8 from Sun Microsystems. By supplying a long argument to the -dev option normally used to set the output device, it is possible to execute...

ssh-xauth.txt

The default SSH configuration for SSH1 and SSH2 allow for remote controlling of X sessions through X forwarding. All children of the SSH connection are able to tunnel X11 sessions through the X tunnel to the client X11 session. This is accomplished by running xauth upon logging in. If xauth is...

X11.tmp.txt

Date: Mon, 2 Nov 1998 23:04:43 +0100 From: Pavel Kankovsky To: [email protected] Subject: X11 cookie hijacker drwxrwxrwx 2 root root 1024 Oct 30 19:57 /tmp/.X11-unix Hang on, aren't those dangerous permissions? Pretty dangerous. Shall I look for my old cookie hijacker? Please post the bloody...

X11R6 3.3.3 - Symlink

X11R6 3.3.3 - Symlink // source: https://www.securityfocus.com/bid/326/info There is a symlink vulnerability known to exist under most modern linux and NetBSD distributions. It involves /tmp/.X11-unix and the tendency to follow to/overwrite the file pointed to if a symlink. It may be possible for...