CVE-2025-62879: 
Chainguard vulnerability analysis and mitigation

CVE-2025-62879 is an information disclosure vulnerability in the SUSE Rancher Backup Operator (rancher/backup-restore-operator) that causes S3 credentials — both accessKey and secretKey — to be leaked into pod logs. The accessKey is exposed under default logging conditions (trace: false, debug: false), while the secretKey is additionally exposed when trace or debug logging is enabled. Affected versions span four release branches: 6.0.0–6.0.3, 7.0.0–7.0.5, 8.0.0–8.1.2, and 9.0.0–9.0.1. The vulnerability was published on January 29, 2026, and carries a CVSS v3.1 base score of 6.8 (Moderate) per the GitHub Advisory, with a scope-changed vector (GitHub Advisory).

The root cause is classified as CWE-532 (Insertion of Sensitive Information into Log File): the Rancher Backup Operator fails to redact S3 credentials before writing them to the rancher-backup-operator pod's logs. The accessKey is logged unconditionally at default log levels, while the secretKey is additionally exposed when trace: true or debug: true is set. An attacker with high-privilege cluster access can exploit this by enumerating pod logs via standard Kubernetes log access mechanisms (e.g., kubectl logs). The fix applies redaction to sensitive fields before they are written to logs (GitHub Advisory).

Successful exploitation allows a high-privileged cluster user to retrieve S3 accessKey and, under non-default logging configurations, the secretKey from pod logs, enabling unauthorized access to S3 storage resources. Because the accessKey is exposed under default settings, all deployments of affected versions are at risk without any special configuration. This could lead to data exfiltration from S3 buckets, manipulation of backup data, or further lateral movement within cloud infrastructure if the compromised credentials have broad permissions (GitHub Advisory, Feedly).

1. Reconnaissance: Identify a Rancher deployment using an affected version of the Backup Operator (6.0.0–6.0.3, 7.0.0–7.0.5, 8.0.0–8.1.2, or 9.0.0–9.0.1) with S3 backup configured.
2. Gain cluster access: Obtain high-privilege access to the Kubernetes cluster (e.g., via a compromised admin account, stolen kubeconfig, or misconfigured RBAC).
3. Locate the backup operator pod: Run kubectl get pods -n cattle-resources-system (or the relevant namespace) to identify the rancher-backup-operator pod.
4. Retrieve pod logs: Execute kubectl logs <rancher-backup-operator-pod> -n cattle-resources-system to dump the pod's log output.
5. Extract credentials: Parse the log output for the S3 accessKey (present under default logging) and, if debug/trace logging was enabled, the secretKey.
6. Abuse S3 credentials: Use the extracted credentials with AWS CLI or S3-compatible tools to access, exfiltrate, or tamper with backup data stored in the configured S3 bucket (GitHub Advisory).

• Logs: Presence of S3 accessKey strings in rancher-backup-operator pod logs under default log levels; presence of secretKey strings in logs when debug or trace logging is enabled.
• Kubernetes Audit Logs: Unexpected or unauthorized kubectl logs requests targeting the rancher-backup-operator pod, especially from accounts not typically associated with backup administration.
• S3 Access Logs: Unusual API calls (e.g., ListBuckets, GetObject, PutObject) originating from IP addresses or user agents inconsistent with normal backup operator activity, using the exposed accessKey.
• Network: Outbound S3 API requests from unexpected sources using credentials matching those configured in the Rancher Backup Operator (GitHub Advisory).

Patched versions are available: 6.0.3, 7.0.5, 8.1.2, and 9.0.1 (Helm chart versions: 105.0.6+up6.0.3, 106.0.6+up7.0.5, 107.1.2+up8.1.2, 108.0.1+up9.0.1). After upgrading, users should rotate both S3 accessKey and secretKey, especially if logs were exported or accessed by unauthorized parties. For users unable to update Rancher itself, refreshing the Rancher app Repository allows upgrading only the Rancher Backup chart (not applicable to air-gapped clusters, which require a full Rancher update first). As an interim workaround, ensure both debug and trace logging values are set to false (the default) to limit exposure to only the accessKey (GitHub Advisory, openSUSE Security).

The vulnerability was reported by the SUSE Rancher Security team and addressed via a coordinated disclosure published to the GitHub Advisory Database on January 29, 2026. An openSUSE security announcement was also issued, indicating vendor acknowledgment across the SUSE ecosystem (openSUSE Security). No notable independent researcher commentary or significant social media discussion has been identified beyond standard CVE tracking feeds.