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Newsgroups: mail-lists.delegate-en

[DeleGate-En] Antwort: Re: [DeleGate-En:3553] delegate security flaw [Virus checked]
18 Oct 2006 12:26:05 GMT

Hello Yutaka,

even with stls this is not the case ! the permission is denied after an 
initial relay has been made to an arbitrary server.
therefore the delegate master process still is vulnerable to ddos ! :-(

greetz martin papadopoulos (Yutaka Sato) 
18.10.2006 13:46
Bitte antworten an

Re: [DeleGate-En:3553] delegate security flaw [Virus checked]


In message 
on 10/18/06(18:36:53)
you wrote:
 |i recently discovered a security flaw which is related to the delegate 
 |permission control
 |allthough using a filter like FCL="sslway ..... -Vrfy" , when running in 

 |master mode , clients which are rejected by the ssl-layer, still
 |cause delegate to open a connection to a destination server , this can 
 |has been used to accomplish ddos . the FCL should reject the connection
 |establishment to an arbitrary server , before rejecting the ssl 
 |. in case you need log files for forensik analysis, i will post them. 
 |now, i strongly 
 |recommend everyone to shut down delegate master services until this one 
 |fixed :-)

Maybe you are using a version of DeleGate older than DeleGate/9.2.5-pre7.
As written in <URL:> after 
I'm shifting to STLS=fcl,fsv instead obsoleted FCL,FSV=sslway in the 
versions.  In fact, FCL,FSV=sslway for MASTER is disabled in 9.2.5-pre7.

With STLS=fcl, the whole communication between DeleGates is encrypted with
SSL, so if the SSL-layer is not established, no father action will be 
Chaining DeleGates with MASTER and STLS can be done as follows.

  a% delegated -Pa:8888 STLS=fcl
  b% delegated -Pb:8023 STLS=fsv MASTER=a:8888 SERVER=telnet

You can use authentication by client-side certificate as follows:

  a% delegated -Pa:8888 STLS="fcl,sslway -Vrfy"
  b% delegated -Pb:8023 STLS="fsv,sslway -cert file" MASTER=a:8888 

Now the latest pre-release version of DeleGate has become 9.2.5-pre19 
is almost ready to be released as an official version DeleGate/9.2.5
to be released tomorrow <URL:
So you are strongly recommended to use the latest version of DeleGate with

  9 9   Yutaka Sato <>
 ( ~ )  National Institute of Advanced Industrial Science and Technology
_<   >_ 1-1-4 Umezono, Tsukuba, Ibaraki, 305-8568 Japan
Do the more with the less -- B. Fuller

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