Azure Bastion Elevation of Privilege Vulnerability

This elevation of privilege vulnerability within Azure Bastion poses a significant risk. An attacker who successfully exploits this flaw could bypass standard authentication and authorization mechanisms, gaining control over the Bastion host and potentially the underlying virtual machines it manages. This could lead to data breaches, system compromise, and disruption of critical services. The blast radius extends to any resources accessible through the compromised Bastion host, potentially impacting sensitive data and applications. The ability to escalate privileges makes it possible to move laterally within the Azure environment, compromising other resources.

Organizations heavily reliant on Azure Bastion for secure access to virtual machines are at significant risk. Environments with misconfigured Bastion hosts, weak authentication policies, or inadequate network segmentation are particularly vulnerable. Shared hosting environments utilizing Azure Bastion also face increased risk due to the potential for cross-tenant attacks.

• azure: Review Azure Activity Logs for unusual login attempts or privilege escalations related to Azure Bastion. • azure: Utilize Azure Security Center’s vulnerability assessment to identify instances of vulnerable Azure Bastion deployments. • generic web: Monitor Bastion host access logs for suspicious requests or unauthorized access attempts. • generic web: Implement Azure Network Security Groups (NSGs) to restrict inbound and outbound traffic to the Bastion host, limiting potential attack vectors.

1. 2025-11-20Disclosure

   disclosure

1. 予約済み2025-06-09
2. 公開日2025-11-20
3. 更新日2026-02-26
4. EPSS 更新日2026-03-23

While a patch is pending, several mitigation steps can be taken to reduce the risk. Implement strict network segmentation to limit the potential impact of a compromise. Enhance monitoring and logging to detect suspicious activity. Review and enforce the principle of least privilege for users accessing Azure Bastion. Consider using Azure Security Center to identify and remediate potential vulnerabilities. Regularly review Bastion host configurations to ensure they adhere to security best practices. After the patch is applied, confirm successful remediation by verifying that the vulnerability scan reports no longer identify the issue.