Montana Flynn

For older versions of Ubuntu the apt-get repos won't have the fix. In that cases I recommend building from source. Here's a handy-dandy shell script to do it for you:

#!/bin/sh

GCC=`which gcc`
if [ -z "$GCC" ]; then
    echo "Your system does not have the GNU gcc complier installed."
    echo "Please install the gcc complier and then run this script again."
    exit 1
fi

echo "Creating tmp folder..."
cd /tmp
mkdir bash
cd bash
echo "Downloading Bash..."
wget -N https://ftp.gnu.org/gnu/bash/bash-4.3.tar.gz
echo "Downloading Bash patches..."
while [ true ];
    do i=`expr $i + 1`; wget -N https://ftp.gnu.org/gnu/bash/bash-4.3-patches/bash43-$(printf '%03g' $i);
    if [ $? -ne 0 ];
        then break;
    fi;
done
echo "Extracting bash from tar.gz..."
tar zxvf bash-4.3.tar.gz 
cd bash-4.3
echo "Applying Patches..."
for p in `ls ../bash43-[0-9][0-9][0-9]`; do patch -p0 < $p; done

echo "Ready to install. Configuring..."
./configure --prefix=/
echo "Running make"
make
echo "Running make install"
if [[ "$USER" == "root" ]]
then
  make install
  cp /bin/bash /usr/local/bin/bash
else
  sudo make install
  sudo cp /bin/bash /usr/local/bin/bash
fi

echo "----------------------------------------------"
echo "Now open a new bash shell to see if it's still vulnerable."