CVE-2005-0821 in MetaFrame
Summary
by MITRE
Unknown vulnerability in Citrix MetaFrame Conferencing Manager 3.0 allows conference members to bypass organizer restrictions to control the keyboard and mouse.
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Analysis
by VulDB Data Team • 07/22/2017
The vulnerability identified as CVE-2005-0821 represents a critical access control flaw within Citrix MetaFrame Conferencing Manager version 3.0, a unified communications platform designed for enterprise video conferencing and collaboration. This issue specifically affects the authorization mechanisms that govern participant permissions within virtual meeting environments, creating a scenario where unauthorized users can escalate their privileges and gain control over shared computing resources. The vulnerability exists in the conference management component of the Citrix MetaFrame platform, which is widely deployed in corporate and institutional settings for secure remote collaboration and meeting management.
The technical flaw manifests as a failure in the permission validation system that controls how conference participants interact with shared desktop environments. When a user joins a conference session, the system should enforce strict role-based access controls that differentiate between organizer and participant privileges. However, this vulnerability allows certain conference members to bypass these established restrictions through a flaw in the authentication and authorization flow. The vulnerability specifically enables unauthorized participants to assume control over keyboard and mouse inputs within the shared session, effectively granting them the same administrative capabilities as the meeting organizer. This represents a classic privilege escalation vulnerability that falls under the CWE-264 category of permissions, privileges, and access controls, where insufficient access control checks allow users to perform actions beyond their designated permissions.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it creates a potential vector for complete session compromise and data exfiltration. An attacker who successfully exploits this vulnerability can manipulate the shared desktop environment to execute arbitrary commands, access sensitive documents, modify meeting content, and potentially gain access to underlying network resources. The implications are particularly severe in enterprise environments where sensitive business information, financial data, and proprietary communications are regularly discussed during conference sessions. This vulnerability essentially undermines the fundamental security model of the conferencing platform, allowing malicious participants to assume the identity and control level of meeting organizers, which could lead to significant financial losses, intellectual property theft, and compliance violations. The attack surface is particularly concerning given that conference managers often have elevated privileges within the network environment and may have access to restricted systems and data.
Mitigation strategies for this vulnerability should focus on immediate patch deployment and comprehensive access control reinforcement. Organizations should prioritize updating to the latest available version of Citrix MetaFrame Conferencing Manager that addresses this specific authorization flaw, as the vulnerability was likely resolved through enhanced permission validation mechanisms and improved session management protocols. Network segmentation and firewall rules should be implemented to restrict access to conferencing services, limiting the attack surface and preventing unauthorized access to the platform. Additionally, organizations should implement strict monitoring of conference session activities and establish clear policies regarding participant permissions and session control. The remediation process should include comprehensive security assessments of existing conference sessions and participant access controls, ensuring that proper role-based access controls are enforced throughout the platform. This vulnerability highlights the critical importance of maintaining up-to-date security patches and implementing robust access control measures in collaborative environments where sensitive information is regularly shared and discussed. Organizations should also consider implementing multi-factor authentication and additional session security measures to prevent unauthorized access to critical collaborative platforms.