[caiu] Ataque a servidor de e-mail
Osvaldo Filho
osvaldofilho.redes em gmail.com
Quarta Agosto 26 17:28:31 BRT 2015
Infelizmente sim. Verifiquei agora, pois não possuo acesso ao FW.
2015-08-26 15:31 GMT-03:00 Cássio Elias de Sousa Figueiredo <
cassioelias em corples.com.br>:
> Só uma dúvida, mas você deixa pingar nesse servidor em questão?
>
>
> Em 26/08/2015 15:01, Leonardo da Silva Fiuza Pina escreveu:
>
>> A pergunta é se o invasor irá utilizar o webmail com captcha ou o
>> servidor SMTP/POP/IMAP diretamente, que nem faz idéia o que é um captcha.
>>
>> Impor o uso de senhas seguras ainda é uma solução válida e viável se
>> souber implementar.
>>
>> Cordial cumprimento.
>>
>> On 08/26/2015 14:52, Osvaldo Filho wrote:
>>
>>> Acho que se houver acesso via webmail sim, isso seria implementado em
>>> cima
>>> do Apache com PHP.
>>>
>>> 2015-08-26 14:42 GMT-03:00 Eduardo Rigler <erigler em gmail.com>:
>>>
>>> rola captcha no smtp? :-)
>>>>
>>>> []'s
>>>>
>>>>
>>>> Em 26 de agosto de 2015 14:30, Cássio Elias de Sousa Figueiredo <
>>>> cassioelias em corples.com.br> escreveu:
>>>>
>>>> Um captcha nessa poderia ter te ajudado, não?
>>>>>
>>>>>
>>>>> Em 26/08/2015 14:26, Eduardo Rigler escreveu:
>>>>>
>>>>> Isso é um problema. Vc pode elaborar N formas de segurança em todos os
>>>>>> níveis de acesso, se um único usuário tiver um login/senha fácil
>>>>>> demais,
>>>>>> pode ser o mesmo que não ter nada.
>>>>>>
>>>>>> Já entrei em blacklist da noite pro dia por causa da conta de um
>>>>>> ex-colaborador que foi mantida ativa "só por mais um tempinho" e com
>>>>>> "aproveita e troca a senha pra 123456 aí".
>>>>>>
>>>>>>
>>>>>> []'s
>>>>>>
>>>>>>
>>>>>> Em 26 de agosto de 2015 14:17, Osvaldo Filho <
>>>>>> osvaldofilho.redes em gmail.com>
>>>>>> escreveu:
>>>>>>
>>>>>> Terceirização de serviços deste tipo em ambiente público é complicado.
>>>>>>
>>>>>>> Deixar informações sensíveis nas mãos de terceiros para nós aqui.
>>>>>>>
>>>>>>> Sobre a política de senha estamos revendo. O problema é que temos
>>>>>>> servidores antigos e/ou aposentados que não conseguem decorar senhas
>>>>>>> fortes, o que piora mais ainda nossa situação.
>>>>>>>
>>>>>>> 2015-08-26 13:13 GMT-03:00 suporte salvador <
>>>>>>> suporteinfossa em gmail.com
>>>>>>>
>>>>>> :
>>>>>
>>>>>> Se for um usuário de login, pode ter certeza que vem mais por ai.
>>>>>>> Tente
>>>>>>>
>>>>>>>> implementar uma captcha na página de login, isso não soluciona mas
>>>>>>>>
>>>>>>> pode
>>>>
>>>>> inibir.
>>>>>>>> Em 26/08/2015 13:04, "Osvaldo Filho" <osvaldofilho.redes em gmail.com>
>>>>>>>> escreveu:
>>>>>>>>
>>>>>>>> Agradeço a ajuda de todos. De cara fiz uma gambiarra paliativa.
>>>>>>>> Criei
>>>>>>>> um
>>>>>>>> script para pegar os IPs e bloquear direto na máquina via IPTABLES.
>>>>>>>>
>>>>>>>>> Nossos servidores já estão separados (MX/POP/IMAP). Cara um roda em
>>>>>>>>>
>>>>>>>> um
>>>>
>>>>> server.
>>>>>>>>>
>>>>>>>>> 2015-08-26 12:13 GMT-03:00 Eduardo Rigler <erigler em gmail.com>:
>>>>>>>>>
>>>>>>>>> Com certeza, além de colocar os IP's/redes de gerência na whitelist
>>>>>>>>> (pq
>>>>>>>>>
>>>>>>>> sempre vai ter um ~abençoado~ que vai ficar errando a senha até
>>>>>>>>
>>>>>>>>> bloquear
>>>>>>>>> todo mundo).
>>>>>>>>>
>>>>>>>>>> Aqui o padrão é 3 erradas de senha e vai pra banlist por 10 anos
>>>>>>>>>> :D
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> []'s
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Em 26 de agosto de 2015 12:01, Guilherme Domingues <
>>>>>>>>>> guilherme.domingues.oliveira em gmail.com> escreveu:
>>>>>>>>>>
>>>>>>>>>> +1 para Fail2ban
>>>>>>>>>>
>>>>>>>>>>> Ao implementar sugiro aumentar o tempo de estadia destes ips na
>>>>>>>>>>>
>>>>>>>>>>> lista,
>>>>>>>>>>
>>>>>>>>> e
>>>>>>>>>
>>>>>>>>> reduzir o número de tentativas para ser banido.
>>>>>>>>>>
>>>>>>>>>>> LPI 201
>>>>>>>>>>> LPI000161013
>>>>>>>>>>> https://cs.lpi.org/caf/Xamman/certification/process_verify
>>>>>>>>>>> code verification: v8bwxqzja7
>>>>>>>>>>> Linux ID #425752
>>>>>>>>>>> ---
>>>>>>>>>>> "A mente que se abre a uma nova idéia jamais voltará ao seu
>>>>>>>>>>> tamanho
>>>>>>>>>>> original." Albert Einstein
>>>>>>>>>>>
>>>>>>>>>>> 2015-08-26 11:57 GMT-03:00 Douglas Fischer <
>>>>>>>>>>>
>>>>>>>>>>> fischerdouglas em gmail.com
>>>>>>>>>>
>>>>>>>>> :
>>>>>>>>
>>>>>>>>> +1 para Fail2Ban
>>>>>>>>>>
>>>>>>>>>>> Eu recomendaria também tirar o MX(tanto in quanto out) do mesmo
>>>>>>>>>>>>
>>>>>>>>>>>> server
>>>>>>>>>>>
>>>>>>>>>> que
>>>>>>>>>>
>>>>>>>>>>> atende requisições de usuários(Submission/POP3/IMAP/Webmail).
>>>>>>>>>>>>
>>>>>>>>>>>> Alíás, DNS Autoritativo, Proxy Reverso, e MX, eu sempre costumo
>>>>>>>>>>>>
>>>>>>>>>>>> colocar
>>>>>>>>>>>
>>>>>>>>>> numa DMZ específica para serviços de cara-pra-rua....
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> Em 26 de agosto de 2015 11:33, Osvaldo Filho <
>>>>>>>>>>>>
>>>>>>>>>>>> osvaldofilho.redes em gmail.com
>>>>>>>>>>>
>>>>>>>>>>> escreveu:
>>>>>>>>>>>>
>>>>>>>>>>>> Aparentemente brute force. Várias mensagens de log do tip:
>>>>>>>>>>>>
>>>>>>>>>>>>> SASL LOGIN authentication failed: authentication failure
>>>>>>>>>>>>>
>>>>>>>>>>>>> Vou ver com o pessoal que cuida do nosso firewall. Mas como
>>>>>>>>>>>>>
>>>>>>>>>>>>> temos
>>>>>>>>>>>>
>>>>>>>>>>> alunos
>>>>>>>>
>>>>>>>>> e
>>>>>>>>>>>>
>>>>>>>>>>>> professores que publicam coisas em eventos internacionais não
>>>>>>>>>>>>>
>>>>>>>>>>>>> sei
>>>>>>>>>>>>
>>>>>>>>>>> se
>>>>>>>>
>>>>>>>>> podemos bloquear todos os IPs internacionais.
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>>> 2015-08-26 11:26 GMT-03:00 Eduardo Rigler <erigler em gmail.com>:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Ataques de que tipo?
>>>>>>>>>>>>>
>>>>>>>>>>>>>> relay? ssh/rdp or what?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Em 26 de agosto de 2015 11:21, Osvaldo Filho <
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> osvaldofilho.redes em gmail.com
>>>>>>>>>>>>>
>>>>>>>>>>>>> escreveu:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Bom dia,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Alguém está sofrendo ataques aos seus servidores de e-mail.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Aqui
>>>>>>>>>>>>>>
>>>>>>>>>>>>> na
>>>>>>>>>>
>>>>>>>>>> Universidade Federal do Ceará estamos sofrendo ataques
>>>>>>>>>>>
>>>>>>>>>>>> desde
>>>>>>>>>>>>>>
>>>>>>>>>>>>> as
>>>>>>>>
>>>>>>>> 04:00
>>>>>>>>>
>>>>>>>>>> da
>>>>>>>>>>>>
>>>>>>>>>>>>> matina.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Seguem os IPs de origem:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> 173-162-132-221-NewEngland.hfc.comcastbusiness.net
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> [173.162.132.221]
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> unknown[176.61.140.126]
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> unknown[187.85.170.68]
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Esses são os IPs que mais tentaram.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>> Att,
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Osvaldo Filho.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Técnico em TI/Redes - Universidade Federal do Ceará.
>>>>>>>>>>>>>>> Sócio-fundador do i-TIC Digital Livre <
>>>>>>>>>>>>>>> https://www.facebook.com/iticdigital>
>>>>>>>>>>>>>>> - Informação Livre para todos!
>>>>>>>>>>>>>>> Twitter i-TIC Digital Livre: @iticdigital
>>>>>>>>>>>>>>> TUX-CE Member.
>>>>>>>>>>>>>>> Pós-graduando em MBA em Arquitetura de Redes e Cloud
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Computing
>>>>>>>>>>>>>>
>>>>>>>>>>>>> -
>>>>>>>>>
>>>>>>>>> Instituto
>>>>>>>>>>
>>>>>>>>>>> BSB.
>>>>>>>>>>>>>>> Graduado em Redes de Computadores - Centro Universitário
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Estácio
>>>>>>>>>>>>>>
>>>>>>>>>>>>> do
>>>>>>>>>>
>>>>>>>>>> Ceará.
>>>>>>>>>>>
>>>>>>>>>>>> Técnico em Conectividade com Extensão em Desenvolvimento de
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Software
>>>>>>>>>>>>>>
>>>>>>>>>>>>> -
>>>>>>>>>>>>
>>>>>>>>>>>> IFCE
>>>>>>>>>>>>>
>>>>>>>>>>>>>> (Cefet).
>>>>>>>>>>>>>>> Graduando em Telemática - IFCE (Cefet).
>>>>>>>>>>>>>>> Novell Datacenter Technical Specialist.
>>>>>>>>>>>>>>> Linux Professional Institute Certified Level 1.
>>>>>>>>>>>>>>> Novell Certified Linux Administrator (CLA).
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Facebook: Osvaldo Filho
>>>>>>>>>>>>>>> Twitter: @osvaldofilho
>>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>>> caiu mailing list
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>>>>>>>>>>>>>>>
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>> Att,
>>>>>>>>>>>>>
>>>>>>>>>>>>> Osvaldo Filho.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Técnico em TI/Redes - Universidade Federal do Ceará.
>>>>>>>>>>>>> Sócio-fundador do i-TIC Digital Livre <
>>>>>>>>>>>>> https://www.facebook.com/iticdigital>
>>>>>>>>>>>>> - Informação Livre para todos!
>>>>>>>>>>>>> Twitter i-TIC Digital Livre: @iticdigital
>>>>>>>>>>>>> TUX-CE Member.
>>>>>>>>>>>>> Pós-graduando em MBA em Arquitetura de Redes e Cloud Computing
>>>>>>>>>>>>>
>>>>>>>>>>>>> -
>>>>>>>>>>>>
>>>>>>>>>>> Instituto
>>>>>>>>
>>>>>>>>> BSB.
>>>>>>>>>>>>> Graduado em Redes de Computadores - Centro Universitário
>>>>>>>>>>>>>
>>>>>>>>>>>>> Estácio
>>>>>>>>>>>>
>>>>>>>>>>> do
>>>>>>>>
>>>>>>>> Ceará.
>>>>>>>>>
>>>>>>>>>> Técnico em Conectividade com Extensão em Desenvolvimento de
>>>>>>>>>>>>>
>>>>>>>>>>>>> Software
>>>>>>>>>>>>
>>>>>>>>>>> -
>>>>>>>>>>
>>>>>>>>>> IFCE
>>>>>>>>>>>
>>>>>>>>>>>> (Cefet).
>>>>>>>>>>>>> Graduando em Telemática - IFCE (Cefet).
>>>>>>>>>>>>> Novell Datacenter Technical Specialist.
>>>>>>>>>>>>> Linux Professional Institute Certified Level 1.
>>>>>>>>>>>>> Novell Certified Linux Administrator (CLA).
>>>>>>>>>>>>>
>>>>>>>>>>>>> Facebook: Osvaldo Filho
>>>>>>>>>>>>> Twitter: @osvaldofilho
>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>> caiu mailing list
>>>>>>>>>>>>> caiu em eng.registro.br
>>>>>>>>>>>>> https://eng.registro.br/mailman/listinfo/caiu
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> --> PARA SAIR DA LISTA SIGA AS INSTRUÇÕES em:
>>>>>>>>>>>>>
>>>>>>>>>>>>> https://eng.registro.br/mailman/options/caiu
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>> Douglas Fernando Fischer
>>>>>>>>>>>> Engº de Controle e Automação
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> caiu mailing list
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>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>> caiu mailing list
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>>>>>>>>>>>
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>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>
>>>>>>>>>> caiu mailing list
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>>>>>>>>>> https://eng.registro.br/mailman/listinfo/caiu
>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>> Att,
>>>>>>>>>
>>>>>>>>> Osvaldo Filho.
>>>>>>>>>
>>>>>>>>> Técnico em TI/Redes - Universidade Federal do Ceará.
>>>>>>>>> Sócio-fundador do i-TIC Digital Livre <
>>>>>>>>> https://www.facebook.com/iticdigital>
>>>>>>>>> - Informação Livre para todos!
>>>>>>>>> Twitter i-TIC Digital Livre: @iticdigital
>>>>>>>>> TUX-CE Member.
>>>>>>>>> Pós-graduando em MBA em Arquitetura de Redes e Cloud Computing -
>>>>>>>>>
>>>>>>>>> Instituto
>>>>>>>>
>>>>>>>> BSB.
>>>>>>>>> Graduado em Redes de Computadores - Centro Universitário Estácio do
>>>>>>>>>
>>>>>>>>> Ceará.
>>>>>>>>
>>>>>>>> Técnico em Conectividade com Extensão em Desenvolvimento de Software
>>>>>>>>>
>>>>>>>> -
>>>>
>>>>> IFCE
>>>>>>>>
>>>>>>>> (Cefet).
>>>>>>>>> Graduando em Telemática - IFCE (Cefet).
>>>>>>>>> Novell Datacenter Technical Specialist.
>>>>>>>>> Linux Professional Institute Certified Level 1.
>>>>>>>>> Novell Certified Linux Administrator (CLA).
>>>>>>>>>
>>>>>>>>> Facebook: Osvaldo Filho
>>>>>>>>> Twitter: @osvaldofilho
>>>>>>>>> _______________________________________________
>>>>>>>>> caiu mailing list
>>>>>>>>> caiu em eng.registro.br
>>>>>>>>> https://eng.registro.br/mailman/listinfo/caiu
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --> PARA SAIR DA LISTA SIGA AS INSTRUÇÕES em:
>>>>>>>>>
>>>>>>>>> https://eng.registro.br/mailman/options/caiu
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>>
>>>>>>>> caiu mailing list
>>>>>>>> caiu em eng.registro.br
>>>>>>>> https://eng.registro.br/mailman/listinfo/caiu
>>>>>>>>
>>>>>>>>
>>>>>>>> --> PARA SAIR DA LISTA SIGA AS INSTRUÇÕES em:
>>>>>>>>
>>>>>>>> https://eng.registro.br/mailman/options/caiu
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>> Att,
>>>>>>>
>>>>>>> Osvaldo Filho.
>>>>>>>
>>>>>>> Técnico em TI/Redes - Universidade Federal do Ceará.
>>>>>>> Sócio-fundador do i-TIC Digital Livre <
>>>>>>> https://www.facebook.com/iticdigital>
>>>>>>> - Informação Livre para todos!
>>>>>>> Twitter i-TIC Digital Livre: @iticdigital
>>>>>>> TUX-CE Member.
>>>>>>> Pós-graduando em MBA em Arquitetura de Redes e Cloud Computing -
>>>>>>> Instituto
>>>>>>> BSB.
>>>>>>> Graduado em Redes de Computadores - Centro Universitário Estácio do
>>>>>>> Ceará.
>>>>>>> Técnico em Conectividade com Extensão em Desenvolvimento de Software
>>>>>>> -
>>>>>>> IFCE
>>>>>>> (Cefet).
>>>>>>> Graduando em Telemática - IFCE (Cefet).
>>>>>>> Novell Datacenter Technical Specialist.
>>>>>>> Linux Professional Institute Certified Level 1.
>>>>>>> Novell Certified Linux Administrator (CLA).
>>>>>>>
>>>>>>> Facebook: Osvaldo Filho
>>>>>>> Twitter: @osvaldofilho
>>>>>>> _______________________________________________
>>>>>>> caiu mailing list
>>>>>>> caiu em eng.registro.br
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>>>>>>>
>>>>>>>
>>>>>>> --> PARA SAIR DA LISTA SIGA AS INSTRUÇÕES em:
>>>>>>>
>>>>>>> https://eng.registro.br/mailman/options/caiu
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>>
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>>>
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--
Att,
Osvaldo Filho.
Técnico em TI/Redes - Universidade Federal do Ceará.
Sócio-fundador do i-TIC Digital Livre <https://www.facebook.com/iticdigital>
- Informação Livre para todos!
Twitter i-TIC Digital Livre: @iticdigital
TUX-CE Member.
Pós-graduando em MBA em Arquitetura de Redes e Cloud Computing - Instituto
BSB.
Graduado em Redes de Computadores - Centro Universitário Estácio do Ceará.
Técnico em Conectividade com Extensão em Desenvolvimento de Software - IFCE
(Cefet).
Graduando em Telemática - IFCE (Cefet).
Novell Datacenter Technical Specialist.
Linux Professional Institute Certified Level 1.
Novell Certified Linux Administrator (CLA).
Facebook: Osvaldo Filho
Twitter: @osvaldofilho
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