I successfully "fixed" this problem by directly hacking the $CDEBOOT variable and using the xz extraction tool on data.tar.xz instead of anticipating data.tar.gz as in the current /usr/www/cgi-bin/debian_proc.cgi
My debian_proc.cgi is as follows:
/usr/www/cgi-bin/debian_proc.cgi

#!/bin/sh

cleanup() {
        echo "</pre><h4>An error has occurred, cleaning up.</h4>$(back_button)</body></html>"
        clean
        exit 0
}

clean() {
        rm -f data.tar.xz data.tar $CDEBOOT

        for i in $filelist; do
                if test -f /$i; then
                        rm -f /$i >& /dev/null
                fi
        done

        for i in $(echo $filelist | tr ' ' '\n' | sort -r); do
                if test -d /$i; then
                        rmdir /$i  >& /dev/null
                fi
        done
}

. common.sh
check_cookie
read_args

#debug

if test -z "$part" -o "$part" = "none"; then
        msg "You have to specify the filesystem where to install Debian"
fi

DEBDEV=$part
DEBDIR=/mnt/$DEBDEV

if ! test -d "$DEBDIR"; then
        DEBDIR="$(awk '/'$part'/{print $2}' /proc/mounts)"
fi

if test "$submit" = "Install"; then

        if test -z "$mirror" -o "$mirror" = "none"; then
                msg "You have to specify a mirror near you in order to download Debian"
        fi

        if grep -qE 'DNS-320-A1A2|DNS-325-A1A2' /tmp/board ; then SoC=kirkwood; else SoC=orion5x; fi

        DEBMIRROR=$(httpd -d $mirror)

        if test -f $DEBDIR/boot/vmlinuz-*-$SoC -a -f $DEBDIR/boot/initrd.img-*-$SoC; then
                msg "Debian is already installed in this filesystem."
        fi

        #CDEBOOT=$(wget -q -O - $DEBMIRROR/pool/main/c/cdebootstrap/ | sed -n 's/.*>\(cdebootstrap-static_.*_armel.deb\)<.*/\1/p' | tail -1)
        CDEBOOT="cdebootstrap-static_0.6.2_armel.deb"
        write_header "Installing Debian"

        echo "<small><h4>Downloading installer...</h4><pre>"

        cd /tmp
        wget --progress=dot:binary $DEBMIRROR/pool/main/c/cdebootstrap/$CDEBOOT
        if test $? != 0; then cleanup; fi

        echo "</pre><h4>Extracting installer...</h4><pre>"

        ar x $CDEBOOT data.tar.xz
        if test $? != 0; then cleanup; fi

        /ffp/bin/xz -d data.tar.xz
        filelist=$(tar -tf data.tar)
        tar -C / -xf data.tar
        if test $? != 0; then cleanup; fi

        echo "</pre><h4>Downloading and installing Debian, this might take some time...</h4><pre>"

        mkdir -p $DEBDIR
        cdebootstrap-static --allow-unauthenticated --arch=armel \
                --include=linux-image-$SoC,openssh-server,kexec-tools,mdadm \
                wheezy $DEBDIR $DEBMIRROR
        if test $? != 0; then cleanup; fi

        echo "</pre><h4>Debian installed successfully.</h4>"

        echo "<h4>Updating packages....</h4><pre>"

        chroot $DEBDIR /usr/bin/apt-get update

        mdadm --detail --test /dev/$DEBDEV >& /dev/null
        if test $? -lt 2; then # allow degraded but working RAID

                echo "</pre><h4>Adding RAID boot support....</h4><pre>"

                mount -o bind  /proc $DEBDIR/proc
                mount -o bind  /sys  $DEBDIR/sys
                mount -o bind  /dev  $DEBDIR/dev

                chroot $DEBDIR /usr/sbin/update-initramfs -u

                umount $DEBDIR/proc
                umount $DEBDIR/sys
                umount $DEBDIR/dev
        fi

        vers="$(cat /etc/Alt-F) 0.1RC3 0.1RC2" # fallback
        echo "</pre><h4>Downloading and installing Alt-F into Debian...</h4><pre>"
        for ver in $vers; do
                sites="http://sourceforge.net/projects/alt-f/files/Releases/$ver http://alt-f.googlecode.com/files"
                for site in $sites; do
                        echo "</pre><h5>Try downloading Alt-F-$ver from $site...</h5><pre>"
                        wget --progress=dot:mega $site/Alt-F-${ver}.tar
                        if test $? = 0; then
                                altf_down="ok"
                                break
                        fi
                done
                if test -n "$altf_down"; then
                        break
                fi
        done
        if test -z "$altf_down"; then
                echo "</pre><h4>Downloading Alt-F $ver failed...</h4><pre>"
                cleanup
        fi

        tar -xf Alt-F-${ver}.tar
        if test $? != 0; then cleanup; fi
        rootfs=$(basename $(ls alt-f/rootfs.arm.*))
        mv alt-f/$rootfs $DEBDIR/boot/Alt-F-$rootfs
        mv alt-f/zImage $DEBDIR/boot/Alt-F-zImage
        rm -rf alt-f Alt-F-${ver}.tar

        echo "</pre><h4>Setting up some Debian installation details...</h4>"

        echo "<p>Enabling serial port acess..."

        sed -i 's/^[1-6]:/#&/' $DEBDIR/etc/inittab
        echo "T0:1235:respawn:/sbin/getty -n -l /bin/bash -L ttyS0 115200 vt100" >> $DEBDIR/etc/inittab

        echo "<p>Changing Debian message of the day..."

        echo -e "\nYou leaved Alt-F, you are now on your own.\nTo return to Alt-F, execute the command 'alt-f',\n" >> $DEBDIR/etc/motd.tail

        echo "<p>Using same ssh host key as Alt-F is using now...<pre>"

        for i in ssh_host_dsa_key ssh_host_rsa_key ssh_host_dsa_key.pub ssh_host_rsa_key.pub; do
                mv $DEBDIR/etc/ssh/$i $DEBDIR/etc/ssh/${i}-orig
        done

        dropbearconvert dropbear openssh /etc/dropbear/dropbear_rsa_host_key $DEBDIR/etc/ssh/ssh_host_rsa_key
        dropbearconvert dropbear openssh /etc/dropbear/dropbear_dss_host_key $DEBDIR/etc/ssh/ssh_host_dsa_key
        chmod og-rw $DEBDIR/etc/ssh/*
        chown root $DEBDIR/etc/ssh/*

        echo "</pre><p>Setting root password the same as Alt-F web admin password..."

        chroot $DEBDIR /bin/bash -c "/bin/echo root:$(cat /etc/web-secret) | /usr/sbin/chpasswd"
        if test $? != 0; then cleanup; fi

        cp $DEBDIR/etc/default/kexec $DEBDIR/etc/default/kexec-debian
        cp $DEBDIR/etc/default/kexec $DEBDIR/etc/default/kexec-alt-f
        sed -i -e 's|^KERNEL_IMAGE.*|KERNEL_IMAGE="/boot/Alt-F-zImage"|' \
                -e 's|^INITRD.*|INITRD="/boot/Alt-F-'$rootfs'"|' \
                $DEBDIR/etc/default/kexec-alt-f
        cat<<-EOF > $DEBDIR/usr/sbin/alt-f
                #!/bin/bash
                cp /etc/default/kexec-alt-f /etc/default/kexec
                reboot
        EOF
        chmod +x $DEBDIR/usr/sbin/alt-f

        clean

        echo "<h4>Success.</h4>$(goto_button Continue /cgi-bin/debian.cgi)</body></html>"

elif test "$submit" = "Uninstall"; then

        html_header "Uninstalling Debian..."
        busy_cursor_start

        for i in bin boot dev etc home initrd.img lib media mnt opt proc root sbin selinux \
                        srv sys tmp usr var vmlinuz; do
                echo "Removing $DEBDIR/$i...<br>"
                rm -rf $DEBDIR/$i >& /dev/null
        done

        busy_cursor_end
        cat<<-EOF
                <script type="text/javascript">
                        window.location.assign(document.referrer)
                </script></body></html>
        EOF

elif test "$submit" = "Execute"; then

        part=/dev/$(basename $DEBDIR)

        html_header "Executing Debian"

        debian -kexec > /dev/null

        echo "</body></html>"
fi

#enddebug
Debian install script broken

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#329 Debian install script broken

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/usr/www/cgi-bin/debian_proc.cgi
