Vulnerability in Alibaba Nacos
CVE-2021-29441
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.
EPSS: 0.877 (99.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Alibaba Nacos — versions < 1.4.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-29441?
- CVE-2021-29441 is a high-severity vulnerability in Alibaba Nacos, classified under Authentication Bypass by Spoofing. CVSS score: 8.6/10. Published 2021-04-27.
- How severe is CVE-2021-29441?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2021-29441 known to be exploited?
- 46 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.