CVE-2024-58260
📋 TL;DR
A missing server-side validation vulnerability in Rancher Manager allows users with update permissions on other User resources to modify the .username field, potentially causing denial of access for targeted accounts. This affects Rancher deployments where users have permissions to update other user resources.
💻 Affected Systems
- Rancher Manager
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Malicious actors with appropriate permissions could lock out administrators or critical service accounts, causing complete loss of access to Rancher management capabilities and potentially disrupting downstream Kubernetes clusters.
Likely Case
Privileged users accidentally or intentionally modifying usernames of other accounts, causing temporary access issues that require administrative intervention to resolve.
If Mitigated
With proper RBAC controls limiting who can update user resources, impact is minimal to none as only trusted administrators would have necessary permissions.
🎯 Exploit Status
Exploitation requires authenticated access with permissions to update User resources. The vulnerability is straightforward to exploit once an attacker has the necessary permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.8.13, 2.9.4, or 2.10.1
Vendor Advisory: https://github.com/rancher/rancher/security/advisories/GHSA-q82v-h4rq-5c86
Restart Required: Yes
Instructions:
1. Backup your Rancher configuration and data. 2. Upgrade to Rancher v2.8.13, v2.9.4, or v2.10.1 depending on your current version. 3. Follow Rancher's standard upgrade procedures for your deployment method (Helm, Docker, RKE2). 4. Verify the upgrade completed successfully.
🔧 Temporary Workarounds
Restrict User Update Permissions
allTighten RBAC controls to limit which users can update User resources to only essential administrators.
🧯 If You Can't Patch
- Review and restrict RBAC permissions for all users, ensuring only essential administrators can update User resources.
- Implement monitoring for User resource modifications and set up alerts for suspicious username changes.
🔍 How to Verify
Check if Vulnerable:
Check your Rancher version via the UI (Settings -> About) or CLI. If version is below 2.8.13, 2.9.4, or 2.10.1, you are vulnerable.Check Version:
kubectl get pods -n cattle-system -l app=rancher -o jsonpath='{.items[0].spec.containers[0].image}' | grep -o 'rancher/rancher:[^ ]*'Verify Fix Applied:
After upgrading, verify the version shows 2.8.13, 2.9.4, or 2.10.1 or higher. Test that username modifications now require proper validation.📡 Detection & Monitoring
Log Indicators:
- Audit logs showing User resource modifications, particularly username field changes
- Authentication failures for previously working accounts
Network Indicators:
- Increased failed login attempts from specific user accounts
SIEM Query:
source="rancher-audit-logs" AND (event="update" AND resource.type="user" AND changed_fields INCLUDES "username")