CVE-2021-38679 in Kazoo Server
Summary
by MITRE • 02/11/2022
An improper authentication vulnerability has been reported to affect QNAP NAS running Kazoo Server. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of Kazoo Server: Kazoo Server 4.11.22 and later
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Analysis
by VulDB Data Team • 02/16/2022
The vulnerability identified as CVE-2021-38679 represents a critical improper authentication flaw within QNAP NAS devices running the Kazoo Server component. This weakness stems from insufficient validation of user credentials and authentication mechanisms, creating a pathway for unauthorized access to sensitive system resources. The affected QNAP NAS systems utilize Kazoo Server as part of their multimedia and communication infrastructure, making this vulnerability particularly concerning for enterprise and home network environments where these devices serve as central hubs for data storage and media streaming. The vulnerability specifically targets the authentication process, allowing attackers to bypass normal security controls and gain elevated privileges within the system.
The technical implementation of this flaw likely involves inadequate input validation or flawed session management within the Kazoo Server authentication module. Attackers can exploit this weakness to perform unauthorized operations including but not limited to accessing stored media files, modifying system configurations, or establishing persistent backdoor access. The vulnerability's impact extends beyond simple credential theft as it enables complete compromise of the affected NAS device, potentially allowing attackers to use the system as a pivot point for further network infiltration. This type of vulnerability falls under the CWE-287 category of Improper Authentication, which is classified as a high-risk weakness in the Common Weakness Enumeration taxonomy. The ATT&CK framework would categorize this under credential access and privilege escalation techniques, specifically targeting the T1078 sub-technique for Valid Accounts and T1566 for Phishing.
The operational consequences of this vulnerability are severe for organizations relying on QNAP NAS devices for their storage infrastructure. Compromised systems can result in data exfiltration, unauthorized media access, and potential disruption of business operations. The vulnerability affects a broad range of QNAP NAS models that incorporate the Kazoo Server component, making it a widespread concern across enterprise and small business environments. Organizations utilizing these devices for sensitive data storage or media distribution face significant risk of unauthorized access to proprietary content and confidential information. The exploitation of this vulnerability can lead to complete system compromise, allowing attackers to install malicious software, modify system files, or establish persistent access to the network infrastructure.
QNAP has addressed this vulnerability through the release of Kazoo Server version 4.11.22 and subsequent updates, which include enhanced authentication mechanisms and proper credential validation procedures. System administrators should immediately upgrade their affected devices to the patched versions to eliminate the risk of exploitation. The recommended mitigation strategy involves not only applying the software patches but also implementing network segmentation to limit access to NAS devices, enforcing strong authentication policies, and monitoring for unusual network activity that might indicate exploitation attempts. Organizations should conduct thorough vulnerability assessments to identify all affected devices within their network infrastructure and ensure that the patch is properly applied across all instances of the vulnerable software. Regular security monitoring and incident response procedures should be enhanced to detect potential exploitation attempts and maintain overall network security posture.