CVE-2009-3759 in XenCenterWeb
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in sample code in the XenServer Resource Kit in Citrix XenCenterWeb allow remote attackers to hijack the authentication of administrators for (1) requests that change the password via the username parameter to config/changepw.php or (2) stop a virtual machine via the stop_vmname parameter to hardstopvm.php. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/03/2024
The CVE-2009-3759 vulnerability represents a critical cross-site request forgery flaw discovered in the XenServer Resource Kit sample code distributed by Citrix through XenCenterWeb. This vulnerability specifically targets the administrative interfaces of virtualization environments, creating a significant security risk for organizations relying on Citrix XenServer infrastructure. The issue stems from insufficient validation of user requests within the sample code components, particularly affecting the password change and virtual machine management functionalities. These vulnerabilities are particularly concerning because they operate at the administrative level, potentially allowing attackers to gain unauthorized control over critical virtualization resources.
The technical implementation of this CSRF vulnerability occurs through the manipulation of HTTP requests that are automatically executed by a victim's browser when visiting malicious websites or clicking on compromised links. The specific attack vectors involve two primary functions within the sample code: the config/changepw.php endpoint which accepts a username parameter for password modifications, and the hardstopvm.php endpoint that processes stop_vmname parameters to halt virtual machine operations. Both functions lack proper authentication verification and request origin validation, enabling attackers to construct malicious requests that appear legitimate to the XenServer administrative interface. The vulnerability is classified under CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in web applications, and aligns with ATT&CK technique T1566.001 for credential access through spearphishing attachments.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to execute administrative actions without proper authorization. An attacker could potentially change administrator passwords, effectively locking out legitimate users and gaining persistent access to the virtualization infrastructure. Additionally, the ability to stop virtual machines creates opportunities for denial-of-service attacks that could disrupt critical business operations, particularly in environments where virtual machines host essential applications or services. The attack requires minimal sophistication, as the malicious requests can be embedded within web pages or email attachments, making exploitation accessible to threat actors with basic web development knowledge. Organizations using the sample code without proper security hardening are particularly vulnerable, as the default configurations do not include CSRF protection mechanisms.
Mitigation strategies for CVE-2009-3759 should focus on implementing robust CSRF protection measures within the affected applications. The most effective approach involves deploying anti-CSRF tokens that are generated per user session and validated on each request, ensuring that malicious requests cannot be executed without proper authorization. Organizations should also implement proper request origin validation and implement Content Security Policy headers to prevent unauthorized script execution. Additionally, the sample code should be removed or properly secured before deployment in production environments, as the vulnerability exists within the demonstration components provided by Citrix. Security teams should conduct regular audits of administrative interfaces to identify similar vulnerabilities and ensure that all web applications implement proper authentication and authorization controls. The remediation process should also include disabling or removing the vulnerable sample code from XenCenterWeb installations and applying appropriate access controls to administrative functions.