LAB 8.7: econet kernel vulnerability on ubuntu-10.04
Hello,
I'm struggling with lab 8.7 and I can't figure out what I am doing wrong so help would be greatly appreciated.
When I run ./full-nelson it doesn't hang but returns "Exploit failed to get root".
- sysctl kernel.modules_disabled = 0
- commented out blacklist econet and blacklist rds in /etc/modprobe.d/blacklist.conf
- network adapter is eth0
- rds exploit is working
./full-nelson output
[*] Resolving kernel addresses...
[+] Resolved econet_ioctl to 0xf8ef02d0
[+] Resolved econet_ops to 0xf8ef03c0
[+] Resolved commit_creds to 0xc0176140
[+] Resolved prepare_kernel_cred to 0xc0176480
[*] Calculating target...
[*] Triggering payload...
[*] Exploit failed to get root.
What am I missing ?
Thanks in advance !
Comments
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Hi k0dard,
It sounds like everything is set, did you modify the 70-persistent-net.rules file to change the adapter name to eth0?
I just ran through the exercise and it worked. Please reboot after rds-fail and full-nelson.The only hiccup in this exercise is usually the adapter name.
You used the compiler in Ubuntu 10.4 ?Can you post the entire output from full-nelson in a file, maybe a clue in there.
Regards Lee
0 -
Hello Lee,
Thanks for your prompt reply.Original adapter name was eth1 but changed to eth0 after I deleted the 70-persistent-net.rules file, as suggested in lab 8.5 solution.
I've compiled full-nelson.c with Ubuntu 10.04 compiler.So, I tried to redirect output of full-nelson to a file and only the above output (from my first post) redirects, although there is a lot of output on the screen I've tried also to redirect error output, no success.
Then I tried executing full-nelson and saving output from vim, but couldn't save the output either... I did screen capture with some of the output.
Then I tried
script -c "./full-nelson" error.log
and surprisingly I got the root shellSo I guess all this has to do with starting new shells, but I have no idea what happened. The exploit still doesn't work without script...
Any ideas on what's going on ?
Maybe it's worth specifying that I'm using KVM with qemu image and virtual machine manager
Thanks a lot for your help !
k0dard
0 -
Ahh, we are getting closer. The full-nelson is two parts, in the first screen , run full-nelson and it should hang. Move to the second screen and run full-nelson again. The second instance gets the "root" privileges and /bin/sh, while the first screen will terminate the program.
Now your observation, I'll bet there was a full-nelson running without a screen from a previous attempt and when you ran the script it found the running copy and got root.
0 -
Hmm, I know it's two parts, however full-nelson does not hang on the first screen, it just exits with "Exploit failed to get root"
On the other hand, I reboot the VM, I login and run
script -c "./full-nelson"
and I have root without ever running a second instance of full-nelson.Btw, a stupid question - when you say screen, you mean switching virtual terminal, CTRL-ALT-F(something) ?
0 -
My fault for not being clear, "open another terminal session in the GUI" or "open another Virtual Terminal on the console" .
I will continue to investigate and see if I can re-create what you are seeing.0 -
OK, I thought so
There's no GUI on ubuntu 10.04 VM, at least not on mine...
Thanks for your help !0
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