Уязвимость атаки на локальные сервисы через некорректную обработку PAC-файлов в Mozilla Firefox
Описание
Когда включено автоматическое определение прокси и веб-сервер предоставляет файл автоматической конфигурации прокси (PAC), или если такой файл загружается локально, этот PAC-файл может задать отправку запросов на localhost через прокси на другой сервер. Такое поведение по умолчанию запрещено при ручной настройке прокси, однако при включении этой опции оно может позволить злоумышленникам атаковать сервисы и инструменты, подключающиеся к localhost, при доступе через браузер.
Затронутые версии ПО
- Mozilla Firefox до версии 65
Тип уязвимости
Подмена поведения с использованием файлов автоматической конфигурации прокси (PAC)
Ссылки
- Broken LinkMailing ListThird Party Advisory
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- Broken LinkThird Party AdvisoryVDB Entry
- Third Party Advisory
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Уязвимые конфигурации
Одно из
Одно из
Одно из
Одно из
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2
Дефекты
Связанные уязвимости
When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.
When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.
When proxy auto-detection is enabled, if a web server serves a Proxy A ...
When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.
Уязвимость компонента Proxy Auto-Config браузера Firefox, позволяющая нарушителю обойти существующие ограничения безопасности и произвести атаки на службы и инструменты, привязанные к локальному хосту
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2