CVE-2024-50386
📋 TL;DR
This vulnerability in Apache CloudStack allows attackers who can register templates to deploy malicious instances on KVM-based environments, potentially gaining access to host filesystems. This affects CloudStack versions 4.0.0 through 4.18.2.4 and 4.19.0.0 through 4.19.1.2. The compromise can lead to data loss, denial of service, and infrastructure availability issues.
💻 Affected Systems
- Apache CloudStack
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of KVM host filesystems leading to data exfiltration, resource destruction, and persistent backdoor installation across the CloudStack-managed infrastructure.
Likely Case
Attacker gains access to host filesystems through malicious templates, potentially compromising multiple virtual machines and sensitive data stored on the host.
If Mitigated
Limited impact if template registration is restricted to trusted users and proper validation is in place, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Requires ability to register templates (authenticated user privilege). The vulnerability involves missing validation checks for KVM-compatible templates.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.18.2.5 or 4.19.1.3 or later
Vendor Advisory: https://cloudstack.apache.org/blog/security-release-advisory-4.18.2.5-4.19.1.3
Restart Required: Yes
Instructions:
1. Backup CloudStack configuration and database. 2. Download patched version from Apache CloudStack website. 3. Stop CloudStack services. 4. Apply the update according to CloudStack upgrade documentation. 5. Restart CloudStack services. 6. Verify the update was successful.
🔧 Temporary Workarounds
Scan and Validate KVM Templates
linuxScan existing templates on primary storage to identify potentially compromised disks with host filesystem references.
for file in $(find /path/to/storage/ -type f -regex [a-f0-9\-]*.*); do echo "Retrieving file [$file] info. If the output is not empty, that might indicate a compromised disk; check it carefully."; qemu-img info -U $file | grep file: ; printf "\n\n"; done
Restrict Template Registration
allLimit template registration privileges to only trusted administrators instead of allowing all account users by default.
🧯 If You Can't Patch
- Immediately restrict template registration to trusted administrators only
- Scan all existing templates using the provided qemu-img commands and remove any suspicious templates
🔍 How to Verify
Check if Vulnerable:
Check CloudStack version: if running 4.0.0-4.18.2.4 or 4.19.0.0-4.19.1.2 with KVM hypervisor and template registration enabled, the system is vulnerable.Check Version:
Check CloudStack version in management interface or via database query: SELECT version FROM cloud.configuration WHERE name='version'Verify Fix Applied:
Verify CloudStack version is 4.18.2.5 or 4.19.1.3 or later, and test that template validation is properly enforced.📡 Detection & Monitoring
Log Indicators:
- Unusual template registration activity
- Multiple template deployment failures
- Suspicious KVM instance creation patterns
Network Indicators:
- Unusual traffic between CloudStack management interface and KVM hosts
- Abnormal template download patterns
SIEM Query:
source="cloudstack" AND (event="template.register" OR event="vm.deploy") | stats count by user, src_ip🔗 References
- https://cloudstack.apache.org/blog/security-release-advisory-4.18.2.5-4.19.1.3
- https://lists.apache.org/thread/d0x83c2cyglzzdw8csbop7mj7h83z95y
- https://www.shapeblue.com/shapeblue-security-advisory-apache-cloudstack-security-releases-4-18-2-5-and-4-19-1-3/
- http://www.openwall.com/lists/oss-security/2024/11/12/3
