Add MASTG-TEST-0x76-3

tests-beta/ios/MASVS-PLATFORM/MASTG-TEST-0x76-3.md

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+---
+platform: ios
+title: URI Manipulation in WebView 
+id: MASTG-TEST-0x76-3
+type: [static]
+weakness: MASWE-0071
+---
+
+## Overview
+
+The target URL of a [`WkWebView`](https://developer.apple.com/documentation/webkit/wkwebview "Apple Developer") can be set dynamically, for example via the [load](https://developer.apple.com/documentation/webkit/wkwebview/1414954-load "Apple Developer") method. This will load the corresponding content into the view.
+
+The `WkWebView` can be tricked into showing malicious content if this URL can be controlled by an attacker. The input must be properly sanitized to avoid this issue.
+
+## Steps
+
+1. Extract the app as described in @MASTG-TECH-0058.
+2. Review the code or reverse engineer the binary according to @MASTG-TECH-0076 and identify data flows from attacker-controlled input to the load method of `WkWebView`.
+
+## Observation
+
+The output could contain [load operations](https://developer.apple.com/documentation/webkit/wkwebview "Apple Developer") where the URL in the [`URLRequest`](https://developer.apple.com/documentation/foundation/urlrequest?language=objc "Apple Developer") is not hard-coded.
+
+## Evaluation
+
+The test case fails if an attacker-controlled input is passed into a load operation without being sanitized.
+
+The URL should not depend on dynamic input. If this is not avoidable, the input must be sanitized. For example, the app must ensure that only URLs with a set of well-known domains are loaded.