Hi
1st question - try this exploits:
http://milw0rm.com/exploits/9641
http://milw0rm.com/exploits/9598
http://milw0rm.com/exploits/9575
http://milw0rm.com/exploits/9545
http://milw0rm.com/exploits/9542
http://milw0rm.com/exploits/9436
http://milw0rm.com/exploits/9479
this exploits should work on kernel updates older that 15 Aug

2nd - netcat doesn't save logs, but a webserver, like apache save logs
You should clean it, after you will receive a root privileges

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