[AsteriskBrasil] Res: RES: Vulnerabilidade Asterisk

Quarta Novembro 4 15:07:44 BRST 2009

Retirado do link que Saulo passou:

"...
Utilize a opção "alwaysauthreject=yes" dentro da seção [general] do  
seu sip.conf. Esta opção fará que o Asterisk responda a requisições de  
usuários válidos com credenciais invalidas da mesma maneira que ele  
faz para usuários inválidos;
...
"

On Nov 4, 2009, at 2:00 PM, Luciano Antonio Borguetti Faustino wrote:

> Não culparia o Asterisk
>
> http://www.ietf.org/rfc/rfc3261.txt - Sessão 10 Registrations
>
> :-)
>
> []s
>
>
> 2009/11/4 José Eduardo C. Mazolini <eduardo_mazolini em yahoo.com>
> Eu acabo de fazer um teste com X-LITE
> E o asterisk é um problema, aconselho colocar um router SIP na  
> frente e tratar esse problema.
> Ele não devia mostrar para o atacante qual ramal existe qual não.  
> Pois depois de identificado o ramal existente ele passa a testar  
> senhas.
>
> Obrigado pela dica do programa pois é necessário criar algo  
> automático pra bloqueio de intrusos.
> Já ouvi falar em um serviço semelhante a DNS onde são cadastrados  
> maquinas que geram ataque e esse registro dura algumas horas.
> Assim se alguem atacar meu asterisk eu bloqueio e registro esse ip  
> la, vc antes de autorizar uma conexão já confere nesta lista se  
> tiver vc ja bloqueia de cara o atacante.
>
> Isso pode ser complicado pois alguem mal intencionado pode fazer  
> falsas acusações contra vc e vc fica bloqueado sem ter feito nada.
> Mas criar uma base desta com controle sobre os que fazem a denucia,  
> só servidores da empresa, grupo de trabalho, empresas que possuem  
> negocio em comum pode ajudar.
>
> Observe o que aconteceu:
>
> Ramal 1 inexistente:
> x-lite: REGISTER
> Asterisk: 404 Not found
>
> Ramal 2 existente
> x-lite: REGISTER
> Asterisk: 100 Trying
> Asterisk: 401 Unauthorized
> x-lite: REGISTER
> Asterisk: 100 Trying
> Asterisk: 403 Forbidden (Bad auth)
>
>
>
>
>
> Eduardo Mazolini
> (19) 9191-2705
>
>
> De: Luciano Antonio Borguetti Faustino <lucianoborguetti.listas em gmail.com 
> >
>
> Para: asteriskbrasil em listas.asteriskbrasil.org
> Enviadas: Quarta-feira, 4 de Novembro de 2009 13:40:10
>
> Assunto: Re: [AsteriskBrasil] RES: Vulnerabilidade Asterisk
>
> Eder,
>
> Interessante,
>
> Trantando o problema mais profissionamente acoselho a instalação de  
> um IDS/IPS (Snort por exemplo -http://www.snort.org/), onde você  
> consegue identificar esses tipos de ataques e criar ações, como  
> exemplo o bloqueio do host atacante.
>
> []s,
>
> 2009/11/4 Itamar Reis Peixoto <itamar em ispbrasil.com.br>
> eu continuo com a minha opiniao de que iptables e' pra boiola
>
> route add -host 208.38.164.96 reject
>
> resolve o problema !
>
>
>
> 2009/11/4 Eder Souza <eder.souza em bsd.com.br>
> >
> > Log do Asterisk segue ae para vc ver um ataque massivo chutando  
> users sips, repare quantos users ele conseguiu chutar em apenas um  
> segundo !!!
> >
> >
> > uma amostra do log referente ao ataque !!!
> >
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"0"<sip:0 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"1"<sip:1 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"2"<sip:2 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"3"<sip:3 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"4"<sip:4 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"5"<sip:5 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"6"<sip:6 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"7"<sip:7 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"8"<sip:8 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"9"<sip:9 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"10"<sip:10 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"11"<sip:11 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"12"<sip:12 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"13"<sip:13 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"14"<sip:14 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"15"<sip:15 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"16"<sip:16 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"17"<sip:17 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"18"<sip:18 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"19"<sip:19 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"20"<sip:20 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"21"<sip:21 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"22"<sip:22 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"23"<sip:23 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"24"<sip:24 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"25"<sip:25 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"26"<sip:26 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"27"<sip:27 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"28"<sip:28 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"29"<sip:29 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"30"<sip:30 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"31"<sip:31 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"32"<sip:32 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"33"<sip:33 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"34"<sip:34 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"35"<sip:35 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"36"<sip:36 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"37"<sip:37 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"38"<sip:38 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"39"<sip:39 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"40"<sip:40 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"41"<sip:41 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"42"<sip:42 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"43"<sip:43 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"44"<sip:44 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"45"<sip:45 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"46"<sip:46 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"47"<sip:47 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"48"<sip:48 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"49"<sip:49 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"50"<sip:50 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"51"<sip:51 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"52"<sip:52 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"53"<sip:53 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"54"<sip:54 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"55"<sip:55 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"56"<sip:56 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"57"<sip:57 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"58"<sip:58 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:26] NOTICE[2751] chan_sip.c: Registration from '"59"<sip:59 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"60"<sip:60 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"61"<sip:61 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"62"<sip:62 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"63"<sip:63 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"64"<sip:64 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"65"<sip:65 em IP 
> >' failed for '208.38.164.96' - No matching peer found
> > [Oct 12 09:31:27] NOTICE[2751] chan_sip.c: Registration from '"66"<sip:66 em IP 
> >' failed for '208.38.164.96' - No matching peer found
>
>
> ------------
>
> Itamar Reis Peixoto
>
> e-mail/msn/google talk/sip: itamar em ispbrasil.com.br
> skype: itamarjp
> icq: 81053601
> +55 11 4063 5033
> +55 34 3221 8599
>
> _______________________________________________
> http://www.voipmania.com.br
> Telefone IP sem fio Gigaset A580IP por 6 x R$59,90.
> Promoção por tempo limitado!
> Acesse agora http://promo.voipmania.com.br
>
> _______________________________________________
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> AsteriskBrasil em listas.asteriskbrasil.org
> http://listas.asteriskbrasil.org/mailman/listinfo/asteriskbrasil
>
>
>
> -- 
> #!/bin/bash
>
> Luciano Antonio Borguetti Faustino
> GNU/Linux user number: 339110
> ICQ UIN number: 82092097 - ICQ ainda na atividade :)
> http://lucianoborguetti.blogspot.com
>
> Preconceito é opinião sem conhecimento.
>
> :wq
>
> Veja quais são os assuntos do momento no Yahoo! + Buscados: Top 10 -  
> Celebridades - Música - Esportes
>
>
> _______________________________________________
> http://www.voipmania.com.br
> Telefone IP sem fio Gigaset A580IP por 6 x R$59,90.
> Promoção por tempo limitado!
> Acesse agora http://promo.voipmania.com.br
>
> _______________________________________________
> Lista de discussões AsteriskBrasil.org
> AsteriskBrasil em listas.asteriskbrasil.org
> http://listas.asteriskbrasil.org/mailman/listinfo/asteriskbrasil
>
>
>
> -- 
> #!/bin/bash
>
> Luciano Antonio Borguetti Faustino
> GNU/Linux user number: 339110
> ICQ UIN number: 82092097 - ICQ ainda na atividade :)
> http://lucianoborguetti.blogspot.com
>
> Preconceito é opinião sem conhecimento.
>
> :wq
>
> _______________________________________________
> http://www.voipmania.com.br
> Telefone IP sem fio Gigaset A580IP por 6 x R$59,90.
> Promoção por tempo limitado!
> Acesse agora http://promo.voipmania.com.br
>
> _______________________________________________
> Lista de discussões AsteriskBrasil.org
> AsteriskBrasil em listas.asteriskbrasil.org
> http://listas.asteriskbrasil.org/mailman/listinfo/asteriskbrasil