vlad11 Posted May 10, 2017 Компания Cisco выпустила обновление прошивки, в котором устранена критическая уязвимость (CVE-2017-3881), позволяющая получить доступ к коммутаторам на базе Cisco IOS и Cisco IOS XE, поддерживающим протокол CMP (Cluster Management Protocol). Атакующий может получить полный контроль над коммутатором, передав специфичный набор опций CMP при обращении к устройству через telnet. В том числе уязвимости подвержены популярные модели коммутаторов Cisco Catalyst 29xx, 35xx, 37xx, 45xx, 49xx. Уязвимость подтверждена в 318 моделях коммутаторов Cisco и позволяет без аутентификации выполнить любые команды в интерфейсе командной строки, при наличии у атакующего доступа к коммутатору по протоколу telnet. Проблема вызвана ошибкой в реализации протокола CMP, предназначенного для построения кластеров коммутаторов, и связана с тем, что опции CMP могли использоваться не только для локально подключенных между собой устройств, но и при внешнем запросе по сети. В качестве обходного пути защиты можно ограничить доступ к 23 сетевому порту (telnet) или отключить обработку опций CMP. Информация об уязвимости была выявлена в ходе разбора мартовской утечки документов ЦРУ. via Opennet Приличный список моделей Cisco. 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Где прошивки брать будем? Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
snvoronkov Posted May 10, 2017 А зачем прошивки? Акцесс лист на доступ - первое дело. :-) Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
_J_ Posted May 10, 2017 А зачем прошивки? Акцесс лист на доступ - первое дело. :-) Так был access list на control plane что дропал телнет извне - пофиг, команды выполнялись. Нам на нескольких каталистах потерли стартап конфиг и пытались залить свой. Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
snvoronkov Posted May 10, 2017 А зачем прошивки? Акцесс лист на доступ - первое дело. :-) Так был access list на control plane что дропал телнет извне - пофиг, команды выполнялись. Нам на нескольких каталистах потерли стартап конфиг и пытались залить свой. Жёстко. Не знал. Впрочем, у нас все равно нужные модели извне недоступны. Совсем. Немаршрутизируемый сегмент. Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
sol Posted May 10, 2017 This configuration is not vulnerable. Switch#show running-config | include ^line vty|transport input line vty 0 4 transport input ssh line vty 5 15 transport input ssh Switch# Всё не так страшно. Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
ShyLion Posted May 11, 2017 telnet первым делом отключаю на сиськах, там испокон веков у них дыры Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
moonfire Posted May 11, 2017 А зачем прошивки? Акцесс лист на доступ - первое дело. :-) Так был access list на control plane что дропал телнет извне - пофиг, команды выполнялись. Нам на нескольких каталистах потерли стартап конфиг и пытались залить свой. Слабо верится. Как можно без установки TCP сессии, что-то там выполнять? И как можно установить TCP сессию, если висит аксес лист? В публичных местах эксплоита под это дело не было. Больше похоже, что у вас кто-то криво настроил свитчик, и решил свалить всё на хакеров. Вставить ник Quote Ответить с цитированием Share this post Link to post Share on other sites More sharing options...
