The Zsun Wifi card reader is a USB card MicroSD reader with an integrated wifi chip running Linux.
root@sabayon /home/zoobab/lf/git # lsusb Bus 002 Device 005: ID 05e3:0723 Genesys Logic, Inc. GL827L SD/MMC/MS Flash Card Reader
It is exposed as an AP without any encryption ESSID "zsun-sd7F0087FE". I had problems to DHCP to it, but it finally gave my phone an IP in 10.168.168.100 with 10.168.168.1 as default gateway.
I was looking on how to reflash this device with openwrt, there seems to be a serial port left on the board, but I don't know how to dissassemble the device cleanly. So maybe at the end, I will cut the nice plastic enclosure.
Another road is the web interface, which does not seem to resist to shell injection, just type `reboot` in the ESSID, and it will execute that command:
When I press Confirm, the device actually reboots!
I was not able to pass more complex commands with spaces, but now there is a strange malformed telnet port open…
Telnetd on port 11880
There is actually a telnet login prompt on port 11880, I cannot get in with the telnet client I have, so I use socat:
zoobab@zoobab /Users/zoobab $ socat - TCP4:10.168.168.1:11880 ������!���� (none) login: root root Password: zsun1188 Welcome to ------- | / /--/ ___ | / | /| \/ _____ --|--| /_____\ |--- --|-- //--/ / / | __|__ | /|\ / \/ /___\ / | ___|___ ___|____ / | \ / / \| 深圳至上移动科技有限公司 Shenzhen Zsun Cloud Technology Co., LTD. www.zsuncloud.com BusyBox v1.01 (2014.12.27-02:50+0000) Built-in shell (ash) Enter 'help' for a list of built-in commands. ~ #
You can also use Putty, I tried it successfully.
There is 16M flash and and 32M of RAM.
To which directory does it mount its microSD card? It does mount the microsd card under /etc/XXX directory.
It is possible to reflash the device if you insert a VFAT formatted microsd card on the slot, and flash the content via some telnet commands.
There are some command line tool that use the built-in samba server, but it did not worked for me.
~ # cat /proc/version cat /proc/version Linux version 2.6.31--LSDK-9.2.0_U11.14 (root@jwyue) (gcc version 4.3.3 (GCC) ) #1 Wed Dec 17 15:53:04 CST 2014
Those URLs are not working anymore, so I recopied the PCB pictures here: