[GTER] Advisory: Vulnerability exploiting the Winbox port

[Andrio Prestes Jasper]

agora vamos ter que atualizar as RB toda semana kkkkkkkkkkkk

Em 24 de abril de 2018 14:05, Silvio Licht Ahmad <silviola at gmail.com>
escreveu:

> Frediane, não entendi "quando usa o IP Services" ?
>
> Aqui por exemplo, nestas opção eu mantenho tudo desativado menos Winbox (
> porém criei regras para somente aceitar acesso interno ou externo de faixas
> seguras designadas por mim, só que isso é um pouco oneroso, um dia que eu
> estiver viajando, não poderei acessar de onde quiser ).
>
>
>
>
> 2018-04-24 2:02 GMT-03:00 Fernando Frediani <fhfrediani at gmail.com>:
>
> > Quando usa o /ip services acredito que não precisa utilizar regras de
> > firewall. Pra quem tem Fast-path ativado não vai perder essa
> funcionalidade
> > bastante importante para performance do roteador.
> >
> > Cuidado com regras de bloqueio de forward. Por mais bem intencionadas que
> > sejam podem facilmente violar o Marco Civil da Internet bloqueando algo
> que
> > seu cliente (seja ele de trânsito ou de banda larga) não deseje que seja
> > bloqueado.
> >
> > Fernando
> >
> > On 23/04/2018 11:37, Joao Paulo Saldanha wrote:
> >
> >> Vamos atentar a segurança:
> >>
> >> Fiz algumas regrinhas aqui que podem ajudar aos amigos a protegerem seus
> >> MIkrotik. A mesma pode ser aplicada a todas RBs./ip firewall
> address-list
> >>
> >>
> >> add address=SEU_PREFIXO_1 list=ACCESSO_WINBOX
> >>
> >>> add address=SEU_PREFIXO_2 list=ACCESSO_WINBOX
> >>> add address=100.64.0.0/10 list=ACCESSO_WINBOX
> >>> add address=192.168.0.0/16 list=ACCESSO_WINBOX
> >>> add address=172.160.0.0/12 list=ACCESSO_WINBOX
> >>> add address=10.0.0.0/8 list=ACCESSO_WINBOX
> >>>
> >>> /ip firewall filter
> >>> add action=drop chain=input comment=PROTECAO_WINBOX dst-port=8291
> >>> protocol=tcp src-address-list=!ACCESSO_WINBOX
> >>> add action=drop chain=forward comment=PROTECAO_WINBOX dst-port=8291
> >>> protocol=tcp src-address-list=!ACCESSO_WINBOX
> >>>
> >>> /ip firewall filter move [/ip firewall filter find
> >>> comment=PROTECAO_WINBOX] 0
> >>>
> >>> /ip service
> >>> set winbox address="SEU_PREFIXO_1/21,SEU_PREFIXO_2/22,
> >>> 100.64.0.0/10,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16"
> >>>
> >>>
> >> Atentem aos campos SEU_PREFIXO_1, SEU_PREFIXO_2. Coloquem suas faixas no
> >> lugar, caso tenha mais de 2, replique a regra. Se precisarem de
> >> esclarecimentos podem me chamar.
> >> Outro detalhe, que estamos bloqueando acesso total a porta default 8291.
> >> Caso vendam transito, precisaram permitir antes do bloqueio, se não seu
> >> cliente ficará sem acesso externo aos Winbox dele.
> >>
> >> 2018-04-23 9:20 GMT-03:00 Andre Almeida <andre at bnet.com.br>:
> >>
> >> https://forum.mikrotik.com/viewtopic.php?f=21&t=133533
> >>>
> >>> We have discovered a new RouterOS vulnerability affecting all RouterOS
> >>> versions since v6.29.
> >>>
> >>> *How it works*: The vulnerability allowed a special tool to connect to
> >>> the
> >>> Winbox port, and request the system user database file.
> >>>
> >>> *Versions affected*: 6.29 to 6.43rc3 (included). Updated versions in
> all
> >>> release chains coming ASAP.
> >>>
> >>> *Am I affected?* Currently there is no sure way to see if you were
> >>> affected. If your Winbox port is open to untrusted networks, assume
> that
> >>> you are affected and upgrade + change password + add firewall. The log
> >>> may
> >>> show unsuccessful login attempt, followed by a succefful login attempt
> >>> from
> >>> unknown IP addresses.
> >>>
> >>> *What do do*: 1) *Firewall* the Winbox port from the public interface,
> >>> and
> >>> from untrusted networks. It is best, if you only allow known IP
> addresses
> >>> to connect to your router to any services, not just Winbox. We suggest
> >>> this
> >>> to become common practice. As an alternative, possibly easier, use the
> >>> "IP
> >>> -> Services" menu to specify "*Allowed From*" addresses. Include your
> >>> LAN,
> >>> and the public IP that you will be accessing the device from. 2)
> *Change
> >>> your passwords. *
> >>>
> >>> *What to expect in the coming hours/days*: Updated RouterOS versions
> >>> coming
> >>> ASAP. RouterOS user database security will be hardened, and deciphering
> >>> will no longer be possible in the same manner.
> >>>
> >>>
> >>> Andre
> >>> --
> >>> gter list    https://eng.registro.br/mailman/listinfo/gter
> >>>
> >>> --
> >> gter list    https://eng.registro.br/mailman/listinfo/gter
> >>
> >
> > --
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> >
> --
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>



-- 
*Andrio prestes Jasper*
(65) 9 9320-3170 / 8444-0040


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