Описание
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23, an issue in the @angular/platform-server package allows remote attackers to bypass host allowlist constraints and direct server-side outgoing requests to arbitrary external endpoints. This occurs due to a parser differential between the strict WHATWG URL parser used for allowlist validation and the lenient Domino URL parser used to initialize the server emulated DOM. When a server-side request contains a malformed URL with a double port structure (e.g., http://evil.com:80:80/path), Node's strict URL.canParse(url) logic returns false and skips host check validation entirely. However, the same malformed URL is later accepted and parsed leniently by Domino's internal parser, which resolves the origin to http://evil.com:80. The Angular SSR HTTP request interceptor (relativeUrlsTransformerInterceptorFn) then resolves all relative backend HTTP requests against this adopted origin, executing the SSRF attack. This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23.
A flaw was found in the @angular/platform-server package of Angular. This vulnerability allows remote attackers to bypass host allowlist constraints and direct server-side outgoing requests to arbitrary external endpoints. This occurs due to a parser differential between the strict WHATWG URL parser used for allowlist validation and the lenient Domino URL parser. By sending a malformed URL with a double port structure, an attacker can cause the server to skip host validation and resolve the origin to a malicious external endpoint, leading to a Server-Side Request Forgery (SSRF) attack.
Отчет
Important: A Server-Side Request Forgery (SSRF) flaw exists in Angular's @angular/platform-server package, allowing remote attackers to bypass host allowlist restrictions. This vulnerability, present in applications utilizing server-side rendering with host routing allowlists, enables the redirection of internal API requests to arbitrary external endpoints, potentially leading to information disclosure or content manipulation.
Меры по смягчению последствий
If updating is not immediately possible, restrict the outbound network connectivity of the server-side rendering application to only trusted backend services using network egress filtering or firewall rules to prevent connections to arbitrary external endpoints. Additionally, validate and normalize incoming request URLs and Host headers before they are passed to @angular/platform-server, rejecting malformed values that could bypass host allowlist validation. Where possible, avoid constructing the SSR request URL directly from untrusted client-supplied Host headers or absolute-form request URIs.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 8 | dotnet5.0-build-reference-packages | Not affected |
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Дополнительная информация
Статус:
EPSS
8.2 High
CVSS3
Связанные уязвимости
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23, an issue in the @angular/platform-server package allows remote attackers to bypass host allowlist constraints and direct server-side outgoing requests to arbitrary external endpoints. This occurs due to a parser differential between the strict WHATWG URL parser used for allowlist validation and the lenient Domino URL parser used to initialize the server emulated DOM. When a server-side request contains a malformed URL with a double port structure (e.g., http://evil.com:80:80/path), Node's strict URL.canParse(url) logic returns false and skips host check validation entirely. However, the same malformed URL is later accepted and parsed leniently by Domino's internal parser, which resolves the origin to http://evil.com:80. The Angular SSR HTTP request interceptor (relativeUrlsTransformerInterceptorFn) th...
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23, an issue in the @angular/platform-server package allows remote attackers to bypass host allowlist constraints and direct server-side outgoing requests to arbitrary external endpoints. This occurs due to a parser differential between the strict WHATWG URL parser used for allowlist validation and the lenient Domino URL parser used to initialize the server emulated DOM. When a server-side request contains a malformed URL with a double port structure (e.g., http://evil.com:80:80/path), Node's strict URL.canParse(url) logic returns false and skips host check validation entirely. However, the same malformed URL is later accepted and parsed leniently by Domino's internal parser, which resolves the origin to http://evil.com:80. The Angular SSR HTTP request interceptor (relativeUrlsTransformerInterceptorFn) then
Angular is a development platform for building mobile and desktop web ...
@angular/platform-server: URL Parser Differential leading to SSRF Allowlist Bypass
EPSS
8.2 High
CVSS3