[Snort-users] 回复: Need help with telnet

sepehr hashtroudilar sepehr.ha at ...11827...
Sun Dec 25 10:33:04 EST 2016


You are right,  but this is a special case and i cant block telnet :(

On Dec 25, 2016 3:23 PM, "Luke Ager" <luke.ager at ...14399...> wrote:

> 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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