CVE-2017-5572 in XenServer
Summary
by MITRE
An issue was discovered in Linux Foundation xapi in Citrix XenServer through 7.0. An authenticated read-only administrator can corrupt the host database.
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Analysis
by VulDB Data Team • 05/17/2026
The vulnerability identified as CVE-2017-5572 represents a significant security flaw within the Citrix XenServer platform that affects versions through 7.0. This issue specifically targets the Linux Foundation xapi component which serves as the core management interface for XenServer environments. The vulnerability manifests as a privilege escalation vector that allows authenticated users with read-only administrative permissions to compromise the integrity of the host database system. This represents a critical breach in the principle of least privilege and demonstrates how seemingly limited access permissions can be exploited to achieve more severe system compromise.
The technical flaw resides in the insufficient input validation and access control mechanisms within the xapi framework that manages the XenServer host database. When an authenticated read-only administrator performs certain operations, the system fails to properly validate the integrity of database modification requests or enforce proper access boundaries. This allows the attacker to inject malicious data or manipulate existing database entries in ways that were not intended by the system design. The vulnerability is particularly concerning because it operates within the trusted management layer of the virtualization platform, where administrators expect to have controlled access to system resources.
The operational impact of this vulnerability extends beyond simple data corruption as it fundamentally undermines the trust model of the XenServer environment. An attacker with read-only permissions can potentially modify critical system configuration data, alter virtual machine settings, or manipulate database structures that govern the behavior of the entire virtualization platform. This could lead to service disruption, unauthorized access to virtual machines, or even complete system compromise depending on the specific nature of the database corruption. The vulnerability also poses risks to audit trails and system integrity monitoring capabilities that depend on the reliability of the host database.
From a cybersecurity perspective, this vulnerability aligns with CWE-284 (Improper Access Control) and represents a classic case of privilege escalation through inadequate input validation. The ATT&CK framework categorizes this under privilege escalation techniques where an adversary leverages existing access to gain elevated system privileges. Organizations using Citrix XenServer versions through 7.0 should immediately implement mitigations including patching to the latest supported versions, implementing additional monitoring of database access patterns, and reviewing access control policies to ensure that read-only administrators cannot perform operations that might lead to database corruption. The vulnerability underscores the importance of comprehensive security testing of management interfaces and the need for robust input validation mechanisms in critical system components.