How To Crack Fortinet Firewall Bypass

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How To Crack Fortinet Firewall Bypass Windows 10

2 recommendations

2016-Jan-8 6:50 pm

to cramer

Re: AT&T Residential Gateway Bypass - True bridge mode!

Huh? Cramer, the article mentions extracting the cert as an unexplored idea, and specifically shows a way without touching or modifying the At&t box, at all.
Also, the static IPs don't matter, as the entire logic is done on layer 2. So not sure why you bash the first few lines of the article, did you read all of it?
cramer
Premium Member
join:2007-04-10
Raleigh, NC
Westell 6100
Cisco PIX 501

1 recommendation

2016-Jan-9 12:54 am

It's not entirely L2. The RG still has it's own address ('street address') that allows it to continue to interact with the mothership. The other addresses are pealed away from the RG at L2. This method essentially gives two machines the same MAC and uses the L3 (IP) address to funnel traffic to the correct one. It has the advantage of allowing TV and phone to continue working uninterrupted. It's a neat approach for those with the additional netblock.
Two machines using the same MAC and IP address is a much harder nut to crack. This works with the RG's 'pass-thru' mode because all traffic is passing through the RG. It's the man-in-the-middle. It's simply NAT at that point. ('identity NAT') The RG takes what it wants and passes everything else thru -- 1:1 NAT. A 3rd party upstream of the RG has a much harder time knowing what belongs to which clone; EAPOL obviously goes to the RG, but what other things the RG doesn't initiate need to be mapped???
(My original protocol-based vlan hack bridged EAPOL only. That was for an internet only adsl2+ business account. I ran it like that for a few weeks before I switched that NVG510 to true bridged mode, and it worked just fine for ~2yrs -- until we dumped that slow crap.)
I'm pointing out their hand-wavey dismissal of things that don't even matter to their methods. (at best it's filler, at worst search engine clickbait) They don't need the certificate(s) because they aren't replacing the box. They don't need to do any code analysis or reverse engineering, again, because they aren't replacing the box. TR-069 is, and has been, unnecessary for internet service. (tv might . phone certainly does, as that's how it gets provisioned.)

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-18 4:18 pm

to brianlan
It's been awhile since folks posted to this thread. I know Brianlan moved back to TWC. Are others still using this technique to bypass the RG for the two week period?
I don't mind starting a new thread about that for folks currently running the bypass. I'm asking because our Gigapower is almost ready for service. I'd like to know if this still works before I agree to a 1 year term.
kbatman
join:2016-03-23
1 edit

1 recommendation

2016-Mar-23 8:29 pm

to brianlan
I have been trying to get this to work with a Cisco SG300 and haven't had much luck. I have tried the following already:
- Set the switch's IP to 192.168.9.254 (is this consequential vs DHCP?)
- Set port 1 to VLAN 2 (untagged)
- Set port 2 to VLAN 2 (untagged)
- Set port 3 to VLAN 3 (untagged)
Disabled SLP, LLDP, CDP, EEE, and LAG on all 3 ports.
I plugged the ONT into port 1. Turned off our NVG595 (and waited). Then plugged in the NVG595 into port 2.
I get a solid red SERVICE LED and the modem says No IP Obtained. The modem is still in DHCPS from the original setup.
What settings am I missing on the switch/modem? Could someone put together a settings/steps for the Cisco SG300 series?
Thanks!

mitchell195
join:2012-03-25
Trumbull, CT

2016-Mar-23 8:43 pm

Are both ports on the switch showing up?
kbatman
join:2016-03-23

2016-Mar-23 8:46 pm

Showing up as connected? yes. I am wondering if the ONT is seeing the mac/ip of the switch itself and therefore not authenticating. I don't know how to verify this though.

mitchell195
join:2012-03-25
Trumbull, CT

2016-Mar-23 8:48 pm

Hmm, is there a layer 3 interface configured on vlan 2? The SG300 is a layer 3 switch
kbatman
join:2016-03-23

2016-Mar-23 9:02 pm

It says layer 2 operational mode. As for vlan 2 specifically, I didn't configure anything after I created the vlan.
Attached is a copy of my configuration if that helps?
actions · 2016-Mar-23 9:02 pm · (locked)

2016-Mar-23 9:48 pm

to kbatman
said by kbatman:

Showing up as connected? yes. I am wondering if the ONT is seeing the mac/ip of the switch itself and therefore not authenticating. I don't know how to verify this though.

it wouldn't be 'seeing' the IP of the switch unless you have some layer three routing setup, which you should not.
the only way this would really make a difference is if AT&T is whitelisting manufacturer MAC addresses that can talk to the ONT, or, if the ONT can't handle talking to more than one MAC address (IE: it's expecting every IP to be assigned to the same MAC, which won't be the case if you're doing this switch trick)
kbatman
join:2016-03-23

2016-Mar-23 9:53 pm

Is there a way to tell?

mackey
Premium Member
join:2007-08-20

2016-Mar-23 11:13 pm

There's an almost zero chance the SG300 will work. The fact that it has the option to support STP means it's 802.1D compliant, and because it's 802.1D compliant it will drop 802.1X frames.

mitchell195
join:2012-03-25
Trumbull, CT
Juniper SRX220
Cisco Meraki MR16

2016-Mar-24 12:07 am

to kbatman
Here's my thought(Correct me if someone has tried this or finds a flaw in my logic). Use a dumb unmanaged switch, Plug Port 1 into ont, Port 2 into RG. Check to see that the RG connects up. Make sure the mac address of the RG is cloned to your preferred router with the RG's WAN IP information configured on the preferred router's wan interface.
After the configuration of the preferred router is ensured, connect a patch cable to the wan interface of your preferred router. Then quickly disconnect the RG from port 2 of the switch & connect the preferred router into port 2. The switch shouldn't notice as the mac address and ports are the same-meanwhile the link to the ont should remain up allowing traffic to pass.

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-24 12:20 am

to mackey
said by mackey:

There's an almost zero chance the SG300 will work. The fact that it has the option to support STP means it's 802.1D compliant, and because it's 802.1D compliant it will drop 802.1X frames.

So I have a TP-Link SG2424 Smart switch and thought I could use it when I can get Gigapower. Here are the specs. »www.tp-link.us/products/ ··· ications
Do you think it will work? I could get another switch but since this one does VLANS, I was hoping I wouldn't need to. AT&T subs literally just finished installing the drop hand hole boxes today in front of our houses so service should be available very soon. Gigapower Fiber is now in my front yard.
I'd like to keep using my pfSense router which is an older computer. For the price, the features of pfSense are great. I'm actually not sure if this older Core2duo can push full Gigabit with NAT. All Nics are gigabit but I haven't had it on that fast of connection to test. It's a 2007 Lenovo PC. I've got another one at work where I have gigabit so maybe I should test there. I can upgrade the router as well if needed.

mackey
Premium Member
join:2007-08-20
347.6 22.6

2016-Mar-24 1:09 am

said by http://www.tp-link.us/products/details/cat-40_TL-SG2424.html#specifications :

Standards and Protocols: ... IEEE 802.1d ...

If it is truly compliant as it claims then no, it will not work. However there is a small chance it's not completely compliant or certain config options can override it, though I wouldn't count on it.
A 3-NIC computer is probably your best bet at this point; one of the NICs can be a 10/100 USB dongle though as it's only needed for 802.1X from the otherwise unused RG.
mackey

2016-Mar-24 1:17 am

to mitchell195
said by mitchell195:

Here's my thought(Correct me if someone has tried this or finds a flaw in my logic). Use a dumb unmanaged switch, Plug Port 1 into ont, Port 2 into RG. Check to see that the RG connects up. Make sure the mac address of the RG is cloned to your preferred router with the RG's WAN IP information configured on the preferred router's wan interface. After the configuration of the preferred router is ensured, connect a patch cable to the wan interface of your preferred router. Then quickly disconnect the RG from port 2 of the switch & connect the preferred router into port 2. The switch shouldn't notice as the mac address and ports are the same-meanwhile the link to the ont should remain up allowing traffic to pass.

I thought that was discussed earlier in the thread, not sure. It should work fine but will need manual cable swapping whenever you need to re-auth.

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-24 12:03 pm

to mackey
said by mackey:

If it is truly compliant as it claims then no, it will not work. However there is a small chance it's not completely compliant or certain config options can override it, though I wouldn't count on it.
A 3-NIC computer is probably your best bet at this point; one of the NICs can be a 10/100 USB dongle though as it's only needed for 802.1X from the otherwise unused RG.

So even with any Spanning Tree settings disabled, it still won't bridge traffic at layer 2 if I just do a port based VLAN swap as untagged ports? I'm talking about just getting the bridge to work at all for the 14 days like brianlan did. Initially, I'm fine with flopping the VLANS but I didn't want to buy a GS108Ev3 if I didn't need to as I have spare ports on the SG2424. Today the Netgear switch is $34 on Newegg so it's not much money if needed.
Does the GS108Ev3 work because it doesn't have 802.1d? So you would need an almost dumb switch that has vlans but not much else?
I do have a 2 port NIC card that I can add to my pfSense box. Right now the WAN is the motherboad's Broadcom NIC and the LAN is an Intel CT desktop PCIx NIC. Works fine on my 50x5 TWC connection.
So instead of buying a switch, could you do the same VLAN swap with NICs on the pfSense router? Just long enough to bridge the RG so the ONT authenticates. I like the idea of being able to do the VLAN changes better on the switch because the config is easier and there is less to mess up.
I'd be willing to try and see if there is a way to leave the RG in place and configure to not have to do the VLAN switches as long as I can get the bypass to work in the 1st place. Thanks for your help and patience on this. I'm still learning a lot of my networking skills.
The rub with all this is that Gigapower is a year term to sign up for service. While I can 'manage' for a year if needed, it's not like being able to jump back to TWC a month later if things don't work well. I'd still like to have house wired for fiber so I will probably get Gigapower as Google is realistically more than a year away from service. My Gigapower Hand hole box from the tap to my yard got set yesterday. After inspections today or next week, they should finally hand us over to sales.

mackey
Premium Member
join:2007-08-20
347.6 22.6

2016-Mar-24 12:18 pm

said by F100:

So even with any Spanning Tree settings disabled, it still won't bridge traffic at layer 2 if I just do a port based VLAN swap as untagged ports?

Correct. Spanning Tree is just one sub-part of 802.1D; a device can be 802.1D compliant and not support Spanning Tree at all, but if it supports STP then it must be 802.1D compliant. Disabling STP does not disable 802.1D compliance.
said by F100:

Does the GS108Ev3 work because it doesn't have 802.1d? So you would need an almost dumb switch that has vlans but not much else?

Correct. The GS108E does not support STP or 802.1D.
said by F100:

I do have a 2 port NIC card that I can add to my pfSense box.

Like I said, even a USB dongle should work as a 3rd NIC as it just needs to pass 802.1X traffic.
said by F100:

While I can 'manage' for a year if needed, it's not like being able to jump back to TWC a month later if things don't work well.

I believe there is a 30-day guarantee that allows you to cancel within 30 days if you're not happy with it.

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-24 2:41 pm

Well, I may pick up a GS108E then just to have my bases covered. The one time when having something without advanced features is better. I have a little 8 port unmanged switch and could do the physical swap. But with the VLAN config, and the correct ports forwarded, you should be able to bounce the config from outside the home LAN if you needed to renew the connection.
How many folks here are actively running this RG bypass? I'm wondering what folks are seeing with peering speeds outside this NC area. That seems to be the other issue with AT&T service when compared to TWC who's peering is not too bad.
Anyone have a Gigapower connection I can traceroute to? I was using biranlan's when he had it. Our networking director got some feedback from the folks at MCNC that run NCREN based on this traceroute. They were going to tweak the outbound policies at some point. They did say that AT&T does appear to have quite a few of their own devices in the path but Latency is low.
DMS1
join:2005-04-06
Plano, TX

2016-Mar-24 3:01 pm

said by F100:

But with the VLAN config, and the correct ports forwarded, you should be able to bounce the config from outside the home LAN if you needed to renew the connection.

How come, given that it is the local side of the ONT that won't be authenticated, so nothing will be able to get in or out?
kbatman
join:2016-03-23

2016-Mar-24 3:44 pm

to mackey
Thanks for your help mackey and everyone else!
kbatman
1 edit

2016-Mar-24 4:49 pm

to mackey
I tried doing the cable swap and it didn't work. We have a Fortinet 90D and I configured it with the broadband information of the modem (which is different from the public IP information that the firewall was using from the passthrough). I wonder if there are special settings or virtual routes I need to set up since the modem's WAN information is completely different from the public IP information the router uses.
Edit: It looks like public subnet mode is enabled. I am not sure what the modem's settings should be to make this work (or if the modem's settings matter at all).
Also I am not sure how the router is supposed to route traffic to/from the WAN IP which is different from our external static IPs.
kbatman

2016-Mar-24 5:05 pm

to mitchell195
mitchell195, This is exactly what I tried. It did not work. I am not sure how it could work when the WAN IP information of the RG is different from our static IP addresses.

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-24 5:29 pm

to DMS1
said by DMS1:
said by F100:

But with the VLAN config, and the correct ports forwarded, you should be able to bounce the config from outside the home LAN if you needed to renew the connection.

How come, given that it is the local side of the ONT that won't be authenticated, so nothing will be able to get in or out?
Never Mind, you are right. The ONT would loose authentication completely. I guess I was thinking if you needed to remote in and 'renew' the lease before it expired. Say on day 10 if you were going to be out of town. Have ports forwarded so you can get in with either the RG your your own router.

mackey
Premium Member
join:2007-08-20
347.6 22.6

2016-Mar-24 6:07 pm

to kbatman
said by kbatman:

I am not sure how it could work when the WAN IP information of the RG is different from our static IP addresses.

You need to set the WAN IP of your router to the WAN IP from the NVG (not your statics). at&t's router should route your statics to that IP, though I'm not positive it can do this without CWMP.
kbatman
join:2016-03-23

2016-Mar-24 6:49 pm

That is exactly what I did. Although I am not sure it will work without policy routes that allow 0.0.0.0 to/from the WAN IP. If that is the case, then with a commercial firewall I think I'll need another router with the static IP connected to the router being used as the gateway?

ATT_Pain
@sbcglobal.net

2016-Mar-25 11:51 am

Hi all,
We are considering using the procedure with the NVG595 and AT&T small business U-Verse. Our internet is crippled while the NVG595 is in place.
Our connection to the VNG595 is the direct fiber via a transceiver (per our our network engineer). Would this procedure work for setup? Are people still having success with the original methodology described in the first post, i.e. successfully bypassing the NVG595 and the NAT table limitiations?
Thank you.
dc81
join:2016-01-05

2016-Mar-25 1:38 pm

to brianlan
does this vlan switch method require a reboot every two weeks? Or will just switching the VLANs back for a moment restart the 2 weeks authentication?
I was looking at TP-LINK TL-SG2008 switch since it has a CLI and can setup a cron regularly to take care of this for me.
750.9 947.5

1 recommendation

2016-Mar-25 1:57 pm

said by dc81:

does this vlan switch method require a reboot every two weeks? Or will just switching the VLANs back for a moment restart the 2 weeks authentication?
I was looking at TP-LINK TL-SG2008 switch since it has a CLI and can setup a cron regularly to take care of this for me.

yes, you will have to power cycle the NVG5XX device to reauth the ONT once every 14 days for ondemand reauths. the NVG5XX tries to reauth every 24 hours otherwise.
towards the end of my service with AT&T GP, I had it down to about 30 seconds of downtime, but it was still a manual procedure that you had to be physically present to perform.

F100
join:2013-01-15
Durham, NC
Alcatel-Lucent G-010G-A
(Software) pfSense
Pace 5268AC

2016-Mar-28 2:04 pm

said by brianlan:

yes, you will have to power cycle the NVG5XX device to reauth the ONT once every 14 days for ondemand reauths. the NVG5XX tries to reauth every 24 hours otherwise.
towards the end of my service with AT&T GP, I had it down to about 30 seconds of downtime, but it was still a manual procedure that you had to be physically present to perform.

That's helpful brian. Guess the only way to force reauth on demad is power cycle of the RG.
What you have proved brian is that from a Networking perspective, it's very possible for AT&T to fix the firmware of the RG to have a true bridge mode that passes all traffic for an IP address for Internet only service. The network supports this as does the modem firmware before AT&T customizes it.
That fact that they don't do this for Small business service is what is most disturbing. Businesses like a medical practice that need HIPPA compliance need to be able to control what data is passed across their network on all ports using their own router. With the RG doing NAT on the traffic vs routing it, I'm not sure I could recommend the service to business customers unless AT&T is willing to sign off legally on security compliance. I'd like to see a third party verify that AT&T's firmware on the RG is truly compliant. This is in addition to the limited NAT tables and other issues which impact business customers.

mackey
Premium Member
join:2007-08-20

1 recommendation

2016-Mar-28 2:36 pm

No, the RG should be treated like a black box and presumed hostile, just like every other internet router. Routed vs NATted means nothing, everything sensitive hitting an ISP-controlled device should be encrypted.

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