| タイトル | casdoor commit 0585ecf Missing Authorization |
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| 説明 | Unauthenticated Arbitrary File Upload via /api/upload-resource
Summary
The POST /api/upload-resource endpoint in Casdoor accepts uploads from completely unauthenticated callers. The Casbin authorization policy whitelists this route for the anonymous principal (p, *, *, POST, /api/upload-resource, *, *), and the controller's helper that resolves the target storage provider (GetProviderFromContext) returns the provider directly when a ?provider= query parameter is supplied, bypassing the RequireSignedIn check that gates the fallback path. Any storage provider configured by an administrator (S3, Aliyun OSS, Local File System, Azure Blob, etc.) becomes a public write destination. The resulting Resource record is registered under the attacker-supplied owner / user / application query parameters, so the upload appears as if it were performed by an arbitrary legitimate user. When the storage provider serves uploaded files back (Local File System provider exposes /files/<path>), the attacker can retrieve the file with no authentication, creating a fully unauthenticated read-after-write primitive against the host.
https://github.com/casdoor/casdoor/ |
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| ソース | ⚠️ https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-1-unauthenticated-arbitrary-file-upload-via-apiupload-resource |
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| ユーザー | geochen (UID 78995) |
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| 送信 | 2026年07月08日 15:52 (2 月 ago) |
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| モデレーション | 2026年09月01日 19:55 (2 months later) |
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| ステータス | 承諾済み |
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| VulDBエントリ | 397791 [Casdoor 迄 4.0.0 upload-resource API controllers/resource.go 弱い認証] |
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| ポイント | 20 |
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