{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/secret-abuse/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Kubernetes"],"_cs_severities":["high"],"_cs_tags":["kubernetes","secret-abuse","cloud"],"_cs_type":"advisory","_cs_vendors":["Kubernetes"],"content_html":"\u003cp\u003eThis detection identifies unauthorized access or misuse of Kubernetes Secrets by unusual user names. It leverages Kubernetes Audit logs to identify anomalies in access patterns by analyzing the source of requests based on user names. Kubernetes Secrets store sensitive information like passwords, OAuth tokens, and SSH keys, making them critical assets within a Kubernetes environment. This activity is significant because successful exploitation could lead to unauthorized access to sensitive systems or data, potentially resulting in significant security breaches and exfiltration of sensitive information. The detection logic operates by identifying 'get' requests for secrets originating from usernames that deviate from an established baseline of allowed or expected users.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial access to a system or service with Kubernetes API access.\u003c/li\u003e\n\u003cli\u003eAttacker authenticates to the Kubernetes API using compromised credentials or exploiting a vulnerability.\u003c/li\u003e\n\u003cli\u003eAttacker attempts to enumerate available secrets using \u003ccode\u003ekubectl get secrets --all-namespaces\u003c/code\u003e or a similar command, generating audit logs with \u003ccode\u003everb=list\u003c/code\u003e or \u003ccode\u003everb=get\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eAttacker identifies a target secret containing sensitive information (e.g., database credentials, API keys).\u003c/li\u003e\n\u003cli\u003eAttacker attempts to retrieve the target secret using \u003ccode\u003ekubectl get secret \u0026lt;secret-name\u0026gt; -n \u0026lt;namespace\u0026gt;\u003c/code\u003e or a direct API call, generating an audit log with \u003ccode\u003everb=get\u003c/code\u003e and the target secret name in \u003ccode\u003eobjectRef.name\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe Kubernetes Audit logs record the request, including the username (\u003ccode\u003euser.username\u003c/code\u003e), source IP address (\u003ccode\u003esourceIPs{}\u003c/code\u003e), and the resource being accessed (\u003ccode\u003eobjectRef.resource=secrets\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe detection logic flags the request because the username is not in the allowed list (\u003ccode\u003ekube_allowed_user_names\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eAttacker uses the retrieved credentials or API keys to gain unauthorized access to other systems or data, leading to data exfiltration or further compromise.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows attackers to steal sensitive data stored within Kubernetes secrets, such as credentials, API keys, and certificates. This can lead to unauthorized access to databases, applications, and other systems, resulting in data breaches, service disruption, and potential financial loss. The impact is high due to the sensitive nature of secrets and their potential for widespread damage.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable Kubernetes audit logging and configure the audit policy to capture API requests, as described in the detection configuration notes in the brief.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule to your SIEM to detect unauthorized access to Kubernetes secrets by unusual user names and tune for your environment.\u003c/li\u003e\n\u003cli\u003eInvestigate any alerts generated by the Sigma rule to determine the legitimacy of the access and take appropriate remediation steps.\u003c/li\u003e\n\u003cli\u003eReview and update the \u003ccode\u003ekube_allowed_user_names\u003c/code\u003e macro to ensure it accurately reflects the authorized users in your environment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-03-kubernetes-secret-abuse/","summary":"An unusual username is accessing Kubernetes secrets, potentially leading to unauthorized access and data exfiltration.","title":"Kubernetes Secret Abuse by Unusual User","url":"https://feed.craftedsignal.io/briefs/2024-01-03-kubernetes-secret-abuse/"}],"language":"en","title":"CraftedSignal Threat Feed - Secret-Abuse","version":"https://jsonfeed.org/version/1.1"}