[Snort-users] 回复: Need help with telnet

Luke Ager luke.ager at ...14399...
Sun Dec 25 06:53:51 EST 2016


Since telnet isn't exactly secure my advice would be to block it altogether if possible. 

Sent from my iPhone

> On 25 Dec 2016, at 11:23, sepehr hashtroudilar <sepehr.ha at ...11827...> wrote:
> 
> No i cant speak in Chinese. 
> Let me simplify :
> 
> In my situation:
> i want to detect and drop telnet cmd (send from client) bofore execution on telnet server.
> 
> I want snort:
> 1. to check the stream and match rules with that.
> 2.If any rule matched dont send the final packet to server (witch in telnet is always enter \r or 0d) 
> 3.drop connection.
> 
> I know that stream5 and ftp/telnet is made for these purpose.
> 
> I tried many configuration,  but all the time i get alert after a while. 
> And Connection drop after cmd executed.
> 
> 
>> On Dec 25, 2016 2:16 PM, "eagleliujin" <eagleliujin at ...7427...> wrote:
>> i am sorry,i cant exactly understand you.i dont know your problem.could you please speak chinese?
>> 
>> 在 sepehr hashtroudilar <sepehr.ha at ...11827...>,2016年12月25日 下午4:28写道:
>> Hi, 
>> I have problem with telnet commands that user is typing. 
>> The server to client is ok,  and i successfully get the alert with incoming packets from server, witch i can drop.
>> The problem starts with telnet behavior witch sends every character one by one.
>> With stream5 i managed to get it work but i get the alert afther cmd executed. 
>> Witch I want is, to prevent cmd from execution (ips) and drop the packet before is is executed.
>> 
>> For example: i want every time user try to execute "net user" cmd,  drop the connection before cmd executed on server. 
>> Is there any configuration for this purpose with stream5 or ftp/telnet processors.  or any other configuration/rule?
>> I read entire docs, maybe i cant find!!?
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