Integer overflow in URI leading to potential host spoofing

Vapor is an HTTP web framework for Swift. Prior to version 4.90.0, Vapor's `vapor_urlparser_parse` function uses `uint16_t` indexes when parsing a URI's components, which may cause integer overflows when parsing untrusted inputs. This vulnerability does not affect Vapor directly but could impact applications relying on the URI type for validating user input. The URI type is used in several places in Vapor. A developer may decide to use URI to represent a URL in their application (especially if that URL is then passed to the HTTP Client) and rely on its public properties and methods. However, URI may fail to properly parse a valid (albeit abnormally long) URL, due to string ranges being converted to 16-bit integers. An attacker may use this behavior to trick the application into accepting a URL to an untrusted destination. By padding the port number with zeros, an attacker can cause an integer overflow to occur when the URL authority is parsed and, as a result, spoof the host. Version 4.90.0 contains a patch for this issue. As a workaround, validate user input before parsing as a URI or, if possible, use Foundation's `URL` and `URLComponents` utilities.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

输入验证不恰当

Vapor 安全漏洞

Vapor是vapor个人开发者的一个 Swift 的 Web 开发框架。可用于开发高性能的Web应用，支持 iOS、OS X 和 Ubuntu 系统。 Vapor 4.90.0 之前版本存在安全漏洞，该漏洞源于 vapor_urlparser_parse函数在解析 URI 的组件时使用 uint16_t索引，这可能导致整数溢出。

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