Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a vulnerability in Renovate, a tool that automates dependency updates for software development. The issue could allow a malicious or compromised container registry to intercept credentials used by Renovate if it interacts with such a registry. The primary concern at this stage is to confirm if your organization uses Renovate with container dependencies that might interact with external registries.
- Malicious registries can steal tool credentials.
- Important for teams managing container dependencies.
- Verify Renovate usage with container dependencies.
Attack Path
How an attacker could exploit the issue
An attacker could trick Renovate into sending sensitive registry credentials to a malicious server. This happens when Renovate fetches information about container image tags or digests from a registry. If the registry is compromised or malicious, it can send a specially crafted "Link" header in its response. This header can redirect Renovate to a different, attacker-controlled location, causing it to send the registry's credentials to that location.
- Requires interaction with a malicious registry.
- Trickery via crafted Link header.
- Risk of credential exfiltration.
Live Threat
Current exploitation, exposure, and threat context
Renovate could expose registry credentials when processing container image tags or digests from a malicious or compromised registry. This occurs when Renovate follows pagination links provided in the HTTP Link header to an attacker-controlled host, and the registry's response includes the credentials. This risk is present when the affected system uses container dependencies and interacts with a compromised registry.
- Registry credentials could be exposed.
- Malicious registry redirects pagination links.
- Unauthorized access to registry credentials.
Operational Fix
Recommended remediation, mitigation, and detection steps
This critical vulnerability in Renovate could lead to credential exfiltration if a compromised or malicious container registry is used. Teams responsible for development pipelines, CI/CD tooling, and platform operations should prioritize confirming exposure and planning remediation. The first practical step is to identify all Renovate instances, assess their interaction with container registries, and determine if they are configured to follow pagination links.
- Identify Renovate instances and registry interactions.
- Confirm exposure to malicious registries.
- Plan remediation based on risk.
