CVE-2021-29441
Vulnerability data via CVEDB (Shodan)
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.
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
vuln:CVE-2021-29441product:"Alibaba Nacos" version:"0.1.0"http.html:"Nacos"More intel sources (5)
vuln:CVE-2021-29441vulnerabilities.cve_id: CVE-2021-29441CVE-2021-29441CVE-2021-29441"CVE-2021-29441" exploit -site:nvd.nist.gov