Type packetstorm
Reporter Viktor Steinmann
Modified 2005-12-14T00:00:00


                                            `Situation: Employees should be allowed to access your company network from  
remote by VPN. You want to make sure, that only the hardware of your own  
company is allowed to access the network on the VPN. This because your company  
hardware uses a hardened operating system (personal firewall, virusscanner  
etc.) and you want to make sure, that no viruses/trojans etc. are transported  
into your company network by the VPN from badly configured hardware and/or home  
networks of your employees.  
Solution: Checkpoint SecureClient enforces a policy on the VPN Client, which you  
can define on the VPN Endpoint you log on to (the firewall). Furthermore  
SecureClient includes a personal firewall, which protects the VPN Client from  
the network around him. Every time the VPN Client opens the VPN tunnel, the  
policy is updated, so you can be sure, that your policy is the latest one. In  
the above situation, you would create a policy, which checks several  
parameters, to ensure the workstation is one of yours, e.g. check the windows  
serial number, check a specific process which must be running, you could even  
check the CPUID.  
Checkpoints Datasheet  
"VPN-1 SecureClient strengthens enterprise security by ensuring client machines  
cannot be configured to circumvent the enterprise security policy."  
So far, so good.  
Now we've found a way, to disable that security policy very easily (a 3 line  
batch is all it needs). This means, that people who have a login to your VPN  
site can use whatever hardware they like. No secuity policy is enforced, no  
personal firewall is running - but the VPN part works.  
And now to the sugar part: The Procedure that makes it work:  
Step a) Download SecureClient from the Checkpoint Website  
Step b) Install SecureClient  
Step c) Connect to the VPN Endpoint (which will download the policy)  
Step d) Copy the downloaded policy (local.scv) to a different name (e.g. x.scv)  
Step e) Shutdown SecureClient  
Step f) Create a Batch-File, that looks like this  
copy x.scv local.scv  
goto Loop  
Step g) Edit x.scv to suit your needs (so you fulfill the policy)  
Step h) Run your batch  
Step i) Start SecureClient  
Step j) Connect to the VPN Endpoint and be surprised, that this stupid trick