Critical UniFi OS bug lets hackers gain root without authentication

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Upgrade UniFi OS Server installations to version 5.0.8 or later, as this release addresses all three vulnerabilities and prevents the exploit chain. Use the detection script provided by Bishop Fox to identify vulnerable instances. Because the attack leaves no authentication logs, verify that systems have not been previously compromised before applying updates. Monitor for suspicious requests to '/api/auth/validate-sso/' and '/ucs/update/latest_package', as well as unusual child processes under 'ucs-update' and unexpected sudo command executions. No additional vendor advisories indicate further mitigation steps or that the issue is already mitigated without patching.