// For flags

CVE-2021-29441

Authentication bypass

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

3
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.

Nacos es una plataforma diseñada para el descubrimiento y la configuración dinámica de servicios y la gestión de servicios. En Nacos versiones anteriores a 1.4.1, cuando se configura para usar autenticación (-Dnacos.core.auth.enabled=true), Nacos usa el filtro de servlet AuthFilter para hacer cumplir la autenticación. Este filtro presenta una backdoor que permite a servidores de Nacos omitir este filtro y, por lo tanto, omitir las comprobaciones de autenticación. Este mecanismo es basado en el encabezado HTTP del agente de usuario para que pueda falsificarse fácilmente. Este problema puede permitir a cualquier usuario llevar a cabo cualquier tarea administrativa en el servidor de Nacos

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-30 CVE Reserved
  • 2021-04-27 CVE Published
  • 2022-03-15 First Exploit
  • 2024-08-03 CVE Updated
  • 2024-11-04 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-290: Authentication Bypass by Spoofing
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Alibaba
Search vendor "Alibaba"
Nacos
Search vendor "Alibaba" for product "Nacos"
< 1.4.1
Search vendor "Alibaba" for product "Nacos" and version " < 1.4.1"
-
Affected