CVE-2025-62879: Rancher Backup Operator Info Disclosure

CVE-2025-62879 Overview

A vulnerability has been identified within the SUSE Rancher Backup Operator that results in the leakage of S3 tokens (both accessKey and secretKey) into the rancher-backup-operator pod's logs. This information disclosure vulnerability affects organizations using the Rancher Backup and Restore Operator to manage Kubernetes cluster backups to S3-compatible storage.

The exposure of S3 credentials in pod logs creates significant security risks, as any user with access to view pod logs could potentially harvest these credentials and gain unauthorized access to the associated S3 storage buckets, potentially leading to data theft, tampering, or deletion of backup data.

Critical Impact

S3 access credentials (accessKey and secretKey) are exposed in pod logs, potentially allowing unauthorized access to backup storage buckets and sensitive organizational data.

Affected Products

• SUSE Rancher Backup and Restore Operator

Discovery Timeline

• 2026-03-04 - CVE-2025-62879 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2025-62879

Vulnerability Analysis

This vulnerability is classified under CWE-532 (Insertion of Sensitive Information into Log File), which occurs when applications write sensitive data to log files that may be accessible to users who should not have access to such information.

The Rancher Backup Operator is designed to facilitate backup and restore operations for Rancher-managed Kubernetes clusters. When configured to use S3-compatible storage backends, the operator requires S3 credentials (accessKey and secretKey) to authenticate with the storage service. Due to improper logging practices, these credentials are inadvertently written to the operator pod's logs during normal operations.

In Kubernetes environments, pod logs are typically accessible to users with appropriate RBAC permissions, including cluster administrators and potentially developers with read access to the namespace. This creates an information disclosure pathway where credentials intended to be secret become exposed to a broader audience than intended.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and improper logging hygiene within the Rancher Backup Operator codebase. The application fails to properly redact or mask sensitive credential information before writing operational logs, resulting in plaintext credential exposure. This represents a failure to follow secure coding practices for handling secrets in containerized environments.

Attack Vector

The vulnerability is exploitable via network access by users with elevated privileges. An attacker with access to the Kubernetes cluster and appropriate permissions to read pod logs in the cattle-resources-system namespace (or whichever namespace the backup operator is deployed in) can retrieve the S3 credentials.

The attack scenario involves:

1. An attacker gains access to a Kubernetes cluster where Rancher Backup Operator is deployed
2. The attacker queries the pod logs using kubectl logs or through the Kubernetes API
3. S3 credentials are extracted from the log output
4. The attacker uses these credentials to access the S3 bucket containing backup data
5. Sensitive backup data can be exfiltrated, modified, or deleted

Since no code examples are available, the vulnerability manifests during S3 connection initialization when the operator logs configuration details including authentication credentials. See the GitHub Security Advisory GHSA-wj3p-5h3x-c74q for additional technical details.

Detection Methods for CVE-2025-62879

Indicators of Compromise

• Unusual or unauthorized access to rancher-backup-operator pod logs
• Unexpected S3 API activity from IP addresses not associated with the Rancher cluster
• Anomalous access patterns to backup storage buckets
• Unauthorized listing, downloading, or deletion of backup objects in S3

Detection Strategies

• Implement log access auditing for the rancher-backup-operator pod and related namespaces
• Monitor Kubernetes API server audit logs for pods/log read operations targeting the backup operator
• Configure S3 bucket access logging and analyze for suspicious access patterns
• Set up alerts for S3 credential usage from unexpected source IP addresses

Monitoring Recommendations

• Enable AWS CloudTrail or equivalent logging for S3 bucket access patterns
• Implement Kubernetes audit logging with specific attention to log access events
• Deploy runtime security monitoring for the backup operator namespace
• Configure alerting for any credential-related strings appearing in aggregated logs

How to Mitigate CVE-2025-62879

Immediate Actions Required

• Restrict RBAC permissions for accessing rancher-backup-operator pod logs to only essential personnel
• Rotate S3 credentials immediately if exposure is suspected
• Review S3 bucket access logs for any unauthorized access
• Implement network policies to limit pod log access where possible

Patch Information

Consult the SUSE Bug Report CVE-2025-62879 and the GitHub Security Advisory GHSA-wj3p-5h3x-c74q for the latest patch information and updated versions of the Rancher Backup and Restore Operator that address this vulnerability. Apply vendor patches as soon as they become available.

Workarounds

• Implement strict RBAC policies limiting who can view pod logs in the backup operator namespace
• Use Kubernetes secrets with minimal RBAC exposure instead of environment variables for credential delivery
• Consider using IAM roles for service accounts (IRSA) on AWS instead of static S3 credentials
• Implement log aggregation with automatic credential redaction before storage
• Regularly rotate S3 credentials to minimize the window of exposure

# Restrict log access to the backup operator namespace
kubectl create clusterrole restricted-log-access --verb=get --resource=pods/log

# Apply strict RBAC to limit pod log access
kubectl create rolebinding backup-operator-log-access \
  --clusterrole=restricted-log-access \
  --serviceaccount=cattle-resources-system:backup-admin \
  --namespace=cattle-resources-system

# Rotate S3 credentials and update the backup configuration secret
kubectl create secret generic s3-credentials \
  --from-literal=accessKey=NEW_ACCESS_KEY \
  --from-literal=secretKey=NEW_SECRET_KEY \
  --namespace=cattle-resources-system \
  --dry-run=client -o yaml | kubectl apply -f -