Security vulnerabilities and automated fixes for cwe 494 issues
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A critical vulnerability in the YourSSH application's update service allowed attackers to serve malicious binaries through man-in-the-middle attacks. The `downloadAsset()` function in `update_service.dart` downloaded application binaries directly from URLs without any cryptographic signature or integrity verification. The fix adds SHA-256 digest validation using the GitHub Releases API's digest field, ensuring only authentic binaries are installed.