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CVE-2021-29442— Authentication bypass

Quick assessment

Affected
alibaba nacos
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nacos是中国阿里巴巴（Alibaba）的一个动态服务发现、配置和服务管理平台。该软件支持基于 DNS 和基于 RPC 的服务发现，可提供提供实时健康检查，阻止服务向不健康的主机或服务实例发送请求等功能。 Nacos 存在访问控制错误漏洞，该漏洞源于ConfigOpsController允许用户执行管理操作，比如查询数据库，甚至清除数据库。

CVSS 8.6 · High EPSS 65.72% · P99

Public Exploits 1

Nuclei · 1 CVE-2021-29442.yaml [template]
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I. Basic Information for CVE-2021-29442

Vulnerability Information
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Vulnerability Title
Authentication bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Alibaba nacos 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nacos是中国阿里巴巴（Alibaba）的一个动态服务发现、配置和服务管理平台。该软件支持基于 DNS 和基于 RPC 的服务发现，可提供提供实时健康检查，阻止服务向不健康的主机或服务实例发送请求等功能。 Nacos 存在访问控制错误漏洞，该漏洞源于ConfigOpsController允许用户执行管理操作，比如查询数据库，甚至清除数据库。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
alibaba nacos < 1.4.1 -

II. Public POCs for CVE-2021-29442

# POC Description Source Link Shenlong Link
1 QVD-2024-26473 && CVE-2021-29442 https://github.com/VictorShem/QVD-2024-26473 POC Details
2 Nacos Derby命令执行漏洞利用脚本 https://github.com/XiaomingX/cve-2021-29442-Nacos-Derby-rce-exp POC Details
3 Nacos before version 1.4.1 is vulnerable to authentication bypass because the ConfigOpsController lets the user perform management operations like querying the database or even wiping it out. While the /data/remove endpoint is properly protected with the @Secured annotation, the /derby endpoint is not protected and can be openly accessed by unauthenticated users. These endpoints are only valid when using embedded storage (derby DB) so this issue should not affect those installations using external storage (e.g. mysql). https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-29442.yaml POC Details
4 None https://github.com/Threekiii/Awesome-POC/blob/master/%E4%BA%91%E5%AE%89%E5%85%A8%E6%BC%8F%E6%B4%9E/Nacos%20%E6%9C%AA%E6%8E%88%E6%9D%83%E6%8E%A5%E5%8F%A3%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8C%E6%BC%8F%E6%B4%9E%20CVE-2021-29442.md POC Details
5 https://github.com/vulhub/vulhub/blob/master/nacos/CVE-2021-29442/README.md POC Details
6 Nacos Derby命令执行漏洞利用脚本 https://github.com/nanaao/cve-2021-29442-Nacos-Derby-rce-exp POC Details
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III. Intelligence Information for CVE-2021-29442

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Patches & Fixes for CVE-2021-29442 (1)

Other References for CVE-2021-29442 (2)

IV. Related Vulnerabilities

Same product: nacos
Same vendor: alibaba
Same weakness: CWE-306

V. Comments for CVE-2021-29442

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