{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/lambda/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["AWS Lambda","Lambda"],"_cs_severities":["low"],"_cs_tags":["cloud","aws","lambda","persistence","execution"],"_cs_type":"advisory","_cs_vendors":["Amazon"],"content_html":"\u003cp\u003eAdversaries possessing sufficient permissions to interact with the AWS Lambda API can exploit the service's layer architecture to maintain stealthy persistence. By adding a malicious or unauthorized Lambda layer to an existing function, an attacker can inject code into the function's execution environment without modifying the primary source code. This technique allows for the interception of sensitive data, execution of unauthorized backend tasks, or modification of function output.\u003c/p\u003e\n\u003cp\u003eThis activity is often identified via AWS CloudTrail events where \u003ccode\u003eUpdateFunctionConfiguration\u003c/code\u003e or \u003ccode\u003ePublishLayerVersion\u003c/code\u003e actions occur outside of established CI/CD pipelines. Because Lambda layers are designed for legitimate code sharing and dependency management, monitoring requires distinguishing between automated infrastructure-as-code (IaC) deployments and manual or anomalous API requests. Security teams should prioritize visibility into configuration changes originating from non-authorized identities or unexpected source IP addresses.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows attackers to persist within a serverless environment, potentially leading to long-term data exfiltration or the subversion of internal business logic. The impact is significant for organizations relying heavily on serverless architectures, where such modifications can remain undetected if not monitored at the API level.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the provided detection logic to monitor for AWS Lambda configuration updates that do not originate from known CI/CD or IaC tooling.\u003c/li\u003e\n\u003cli\u003eAudit existing Lambda functions to identify currently attached layers that do not map to authorized internal code repositories.\u003c/li\u003e\n\u003cli\u003eImplement IAM policies that restrict the ability to modify Lambda configurations and publish new layers to specific, highly-privileged automation service roles.\u003c/li\u003e\n\u003cli\u003eEstablish a baseline of expected deployment activity to reduce noise from routine CI/CD releases.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-19T13:23:51Z","date_published":"2026-08-24T09:47:20Z","id":"https://feed.craftedsignal.io/briefs/2026-08-aws-lambda-layer-persistence/","summary":"Adversaries with compromised credentials may modify AWS Lambda configurations by injecting unauthorized layers to establish persistence, run arbitrary code, or intercept data.","title":"Detection of Unauthorized AWS Lambda Layer Modifications","url":"https://feed.craftedsignal.io/briefs/2026-08-aws-lambda-layer-persistence/"}],"language":"en","title":"CraftedSignal Threat Feed - Lambda","version":"https://jsonfeed.org/version/1.1"}