CVE-2024-29993: Azure CycleCloud Privilege Escalation Flaw

CVE-2024-29993 Overview

CVE-2024-29993 is an elevation of privilege vulnerability affecting Microsoft Azure CycleCloud. The flaw allows an authenticated attacker with low privileges to escalate access over the network. Microsoft classifies the issue under improper access control [CWE-284], meaning the product fails to enforce authorization boundaries between users of the cluster orchestration service.

Azure CycleCloud is an enterprise tool for orchestrating high-performance computing (HPC) environments in Azure. A successful attacker gains high impact against confidentiality, integrity, and availability of the affected cluster management plane.

Critical Impact
An authenticated attacker can elevate privileges on Azure CycleCloud 8.6.0, gaining full control over managed HPC cluster resources and workloads.

Affected Products

Microsoft Azure CycleCloud 8.6.0
HPC clusters orchestrated through the affected CycleCloud instance
Azure subscriptions integrated with the vulnerable CycleCloud deployment

Discovery Timeline

2024-04-09 - CVE-2024-29993 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-29993

Vulnerability Analysis

Azure CycleCloud exposes a management interface for provisioning and administering HPC clusters. CVE-2024-29993 stems from improper access control in this interface, mapped to [CWE-284]. An authenticated user with low-level access can invoke functionality reserved for higher-privileged roles.

The vulnerability requires low privileges and no user interaction. It is exploitable over the network with low attack complexity. A successful exploit grants the attacker administrative access to the CycleCloud instance, including the ability to modify cluster configurations, inject scripts into compute nodes, and access sensitive tenant data.

Microsoft has not disclosed the internal component responsible for the flaw. Refer to the Microsoft Vulnerability Advisory for vendor-specific details.

Root Cause

The root cause is missing or insufficient authorization enforcement on privileged operations within CycleCloud. The service accepts requests from authenticated users without verifying that the caller holds the required role for the requested action. This class of flaw allows horizontal or vertical privilege escalation depending on the endpoint invoked.

Attack Vector

An attacker requires valid credentials to the CycleCloud web interface or API. Once authenticated, they issue requests to privileged endpoints that should be restricted to administrators. The server processes these requests without rejecting them based on role. Because CycleCloud manages cluster provisioning, an attacker can push malicious cluster templates, execute code on compute nodes, or extract stored secrets used to interact with Azure resources.

The vulnerability has an EPSS score of 1.992% (78.98 percentile), indicating moderate exploitation likelihood relative to other CVEs. No public proof-of-concept exploit is currently available.

Detection Methods for CVE-2024-29993

Indicators of Compromise

Unexpected creation, modification, or deletion of CycleCloud cluster templates by non-administrative accounts
Anomalous API calls from low-privileged CycleCloud users to administrative endpoints
New cluster nodes provisioned outside of change-managed windows
Unusual outbound connections from CycleCloud-managed compute nodes to attacker-controlled infrastructure

Detection Strategies

Enable audit logging on the CycleCloud application and forward events to a centralized SIEM for correlation
Alert on privilege changes, role assignments, and administrative actions performed by accounts not on an approved administrator list
Correlate CycleCloud activity with Azure Activity Logs to identify unauthorized resource provisioning tied to compromised sessions

Monitoring Recommendations

Continuously monitor authentication events and session activity against the CycleCloud management interface
Baseline normal cluster provisioning behavior and flag deviations in volume, size, or geographic region
Review service principal and managed identity usage tied to CycleCloud for signs of abuse

How to Mitigate CVE-2024-29993

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft Vulnerability Advisory for Azure CycleCloud 8.6.0
Inventory all CycleCloud deployments and confirm version to identify exposed instances
Rotate credentials, API keys, and service principal secrets stored within or used by CycleCloud
Restrict network access to the CycleCloud management interface to trusted administrative networks

Patch Information

Microsoft released a security update addressing CVE-2024-29993. Administrators should upgrade Azure CycleCloud beyond version 8.6.0 following the guidance in the Microsoft Vulnerability Advisory. Verify patch application by checking the CycleCloud version banner in the administrative console.

Workarounds

Limit CycleCloud user accounts to the minimum required and remove unused low-privileged accounts
Place the CycleCloud management endpoint behind a VPN or Azure Private Link to reduce network exposure
Enforce multi-factor authentication on all identities with access to CycleCloud
Review and tighten Azure role-based access control (RBAC) assignments for the subscription hosting CycleCloud

bash

# Verify installed Azure CycleCloud version on the management host
cyclecloud --version

# Restrict inbound access to the CycleCloud management port (example: 8443)
# using an Azure Network Security Group rule
az network nsg rule create \
  --resource-group <rg-name> \
  --nsg-name <nsg-name> \
  --name Restrict-CycleCloud-Mgmt \
  --priority 100 \
  --direction Inbound \
  --access Allow \
  --protocol Tcp \
  --source-address-prefixes <admin-cidr> \
  --destination-port-ranges 8443