Искусственный интеллект Nemesida WAF
Есть мнение, что искусственный интеллект — это не больше, чем маркетинговый ход. В статье мы покажем, как искусственный интеллект Nemesida WAF позволяет выявлять и блокировать атаки на веб-приложения с поразительной точностью в 99,96%.
Теория: принцип работы Nemesida AI
Машинное обучение (распознавание образов) или искусственный интеллект (как сейчас модно говорить), применяется в тех областях, где анализ данных, проводимый человеком, становится невозможным из-за больших объемов информации или неполноты выделяемой информации. В общем, когда у нас в арсенале накопилось больше миллиона запросов к различным веб-приложениям, решение о необходимости применения машинного обучения назрело само собой.
На основе анализа научных исследований и существующих прототипов была построена схема работы Nemeisda AI, а после анализа данных сформировано признаковое пространство из элементов. Поскольку большинство признаков являются текстовыми, производилась их векторизация для дальнейшего использования в алгоритме распознавания. Поскольку поля запросов не являются отдельными словами, а зачастую состоят из последовательностей символов, было принято решение об использовании подхода на основе анализа частоты встречаемости n-грамм (TF-IDF).
Анализ имеющихся данных позволил сформировать пространство признаков, на основе которого и был построен классификатор. Задача обнаружения атак с математической точки зрения формализовалась как классическая задача классификации (два класса: легитимный и нелегитимный трафик). Выбор алгоритмов производился по критерию доступности реализации и возможности тестирования. Наилучшим образом себя показал алгоритм градиентного бустинга (AdaBoost), который позволил на 100 млн. запросов обеспечить 99.96% точности при уровне ложных срабатываний менее 0,04%. Таким образом, после обучения принятие решения Nemesida WAF осуществляется c учетом статистических свойств анализируемых данных, а не на основе детерминированных признаков (сигнатур) атак.
Недостаток сигнатурного метода обнаружения атак по сравнению с AI очевиден — высокая вероятность обхода WAF с большим количеством ложны срабатываний (от 5% до 15%). Тем не менее, сигнатурный анализ является основным источником при обучении и обеспечивает базовую защиту веб-приложения на период обучения Nemesida AI.
Атаки, ложные срабатывания и искусственный интеллект
Для того, чтобы понимать как работает Nemesida AI и какие возможности предоставляет, рассмотрим несколько примеров.
Блокирование атаки сигнатурным методом
Пример атаки, которая будет заблокирована сигнатурным методом. Такой запрос будет заблокирован из-за вхождения цепочки сигнатур «UNION + SELECT»:
POST /wp-content/plugins/answer-my-question/modal.php HTTP/1.1
Host: vulns.pentestit.ru
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 113
Cookie: _ym_uid=1505734077122804829; _ym_isad=2; _ym_visorc_45042173=w
Connection: close
Upgrade-Insecure-Requests: 1id=0+UNION+SELECT+1%2C2%2C3%2C4%2C5%2C6%2Cslug%2Cterm_group%2Cname%2C10%2C11%2C12+FROM+wp_terms+WHERE+term_id%3D1
В этом примере запрос будет заблокирован сигнатурным модулем Nemesida WAF, не смотря на частичную обфускацию:
action=getTopic&topic_id=1 anD0 unio%4e %0a sELEc%74 %23%0a 0b001110010011100100111001001110010011100100100000011101010110111001101001011011110110111000100000011100110110010101101100011001010110001101110100001000000011000100110001001011000110001101101111011011100110001101100001011101000101111101110111011100110010100000110000011110000011001101100001001011000111010101110011011001010111001001011111011011000110111101100111011010010110111000101100011101010111001101100101011100100101111101110000011000010111001101110011001011000111010101110011011001010111001001011111011001010110110101100001011010010110110000101001001000000110011001110010011011110110110100100000011101110111000001011111011101010111001101100101011100100111001100100000011011000110100101101101011010010111010000100000001100010010000000101101001011010010000000101101,12,13,14,15,16,17,18,1,2 %0a&group_id=0id=-1 uniO%6e/*a*/seLEC%74{d1},{d2},{d3},{d4},{d0},{d6},{d7},{d(%23%0aseLEC%74{a0x3c})},NULL,{d10},{d11},{d12}--
Ложные срабатывания при сигнатурном анализе
Теперь рассмотрим примеры запросов, которые не являются атаками на веб-приложение, но все-же будут заблокированы WAF. Результат обработки такого запроса — ложное срабатывание:
GET /function shift() { [native code] } HTTP/1.1
Host: vulns.pentestit.ru
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: _ym_uid=1505734077122804829; _ym_isad=2; _ym_visorc_45042173=w
Connection: close
Upgrade-Insecure-Requests: 1Обработка запроса ниже также приведет в ложному срабатыванию при использовании сигнатурного метода определения атак:
GET /.../news HTTP/1.1
Host: vulns.pentestit.ru
User-agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: _ym_uid=1505734077122804829; _ym_isad=2; _ym_visorc_45042173=w
Connection: close
Upgrade-Insecure-Requests: 1Nemesida AI в действии: повышаем точность определения атак, устраняя ложные срабатывания
Рассмотрим атаки, которые не определятся сигнатурным методом, но будут заблокированы Nemesida AI:
POST /wp-content/plugins/answer-my-question/modal.php HTTP/1.1
Host: vulns.pentestit.ru
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Content-Type: application/x-www-form-urlencoded
Connection: close
Content-Length: 78053id=-1 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