Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a command injection vulnerability in Rancher Manager's cluster import function. The issue could allow remote attackers to execute malicious code by breaking out of an image, potentially impacting cluster operations. The main concern is confirming relevance and exposure.
- Attackers could run unauthorized code.
- It affects cluster management capabilities.
- Confirm relevance and exposure.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by sending specially crafted YAML data to the Rancher Manager import endpoint. This data, when processed by the unsanitized parameters, allows the attacker to break out of the intended image context and execute arbitrary commands, potentially leading to the deployment of malicious containers.
- No authentication is required.
- A malformed YAML parameter triggers it.
- Risk includes arbitrary code execution.
Live Threat
Current exploitation, exposure, and threat context
A command injection vulnerability in the Rancher Manager import endpoint could allow remote attackers to execute arbitrary code. This occurs when unsanitized YAML parameters are used, potentially enabling attackers to break out of an image and run malicious containers.
- System data or code execution.
- Exploiting unsanitized YAML parameters.
- Malicious container execution.
Operational Fix
Recommended remediation, mitigation, and detection steps
The Rancher Manager platform team or the infrastructure team managing Rancher deployments is likely responsible for addressing this command injection vulnerability. The first practical step is to identify all Rancher Manager instances, confirm their exposure to the network, and then determine the business criticality of each instance to prioritize remediation efforts with the accountable owner.
- Identify Rancher instances and exposure.
- Verify business criticality and ownership.
- Plan and execute remediation.
