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medium threat

Rancher Fleet Helm Deployer Vulnerability Allows Security Bypass

A remote, authenticated attacker can exploit a vulnerability in Rancher Fleet Helm Deployer to bypass security measures and disclose sensitive information, which may enable further attacks.

A vulnerability exists within the Rancher Fleet Helm Deployer that allows a remote, authenticated attacker to bypass security precautions. While the specifics of the vulnerability are not detailed in this advisory, successful exploitation could lead to the exposure of sensitive information. The absence of CVE details limits further analysis; however, the potential for unauthorized information disclosure within a Rancher environment warrants attention from security teams. This could be an entry point for more significant attacks.

Attack Chain

  1. The attacker gains initial access to the Rancher Fleet Helm Deployer with valid credentials.
  2. The attacker crafts a malicious Helm chart or modifies an existing one to include payloads designed to exploit the vulnerability.
  3. The attacker deploys the crafted Helm chart via the Rancher Fleet Helm Deployer.
  4. The vulnerability is triggered during the deployment process.
  5. The attacker gains unauthorized access to sensitive information managed by the Rancher Fleet Helm Deployer.
  6. The attacker leverages the disclosed information to further compromise the Rancher environment.
  7. The attacker escalates privileges or moves laterally within the Rancher infrastructure.
  8. The final objective is achieved by the attacker.

Impact

Successful exploitation of this vulnerability could lead to the disclosure of sensitive information within the Rancher environment. This could include configuration details, secrets, or other critical data used by deployed applications. The information obtained could then be used to further compromise the environment, potentially leading to data breaches, service disruption, or other malicious activities. The exact scope and impact depend on the specifics of the vulnerability and the data managed by the Rancher Fleet Helm Deployer.

Recommendation

  • Monitor Rancher Fleet Helm Deployer logs for suspicious activity related to Helm chart deployments, focusing on unusual parameters or unexpected resource access (see example Sigma rule).
  • Implement strict access controls and multi-factor authentication for Rancher Fleet Helm Deployer to limit the potential attack surface.
  • Stay informed about updates and patches released by Rancher for the Fleet Helm Deployer and apply them promptly.

Detection coverage 2

Detect Suspicious Helm Chart Deployments in Rancher Fleet

medium

Detects suspicious Helm chart deployments in Rancher Fleet Helm Deployer based on command-line arguments indicating potential exploitation.

sigma tactics: defense_evasion, discovery sources: process_creation, linux

Detect Sensitive Information Disclosure via Rancher Fleet Helm Deployer

high

Detects potential sensitive information disclosure by monitoring file access patterns associated with the Rancher Fleet Helm Deployer.

sigma tactics: discovery sources: file_event, linux

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