CVE-2021-38680 in Kazoo Server
Summary
by MITRE • 12/29/2021
A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Kazoo Server. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Kazoo Server: Kazoo Server 4.11.20 and later
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Analysis
by VulDB Data Team • 12/31/2021
The vulnerability identified as CVE-2021-38680 represents a critical cross-site scripting flaw within QNAP devices that host the Kazoo Server component. This issue specifically affects the web-based management interface of these network-attached storage devices, creating a potential entry point for malicious actors to execute arbitrary code within the context of a user's browser session. The vulnerability stems from insufficient input validation and output encoding mechanisms within the Kazoo Server's web interface, allowing attackers to inject malicious scripts that can persist and execute when other users interact with the affected system.
The technical exploitation of this XSS vulnerability occurs through the manipulation of input fields or parameters within the Kazoo Server's web application interface. Attackers can craft malicious payloads that, when processed by the server and subsequently rendered in the user's browser, execute unintended scripts with the privileges of the authenticated user. This particular flaw falls under CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities, and aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments or links. The vulnerability's impact is amplified by the fact that QNAP devices are commonly deployed in enterprise environments where users may have elevated privileges, making successful exploitation potentially devastating for organizational security.
The operational impact of CVE-2021-38680 extends beyond simple script execution, as it can enable attackers to perform a wide range of malicious activities including session hijacking, data exfiltration, and privilege escalation. When exploited against authenticated users, the vulnerability allows attackers to gain access to sensitive configuration data, user credentials, and potentially establish persistent backdoors within the network infrastructure. The affected QNAP devices, which often serve as central storage and management points in corporate environments, provide attackers with significant leverage for lateral movement and extended access to internal networks. This vulnerability particularly affects organizations using QNAP devices for their Kazoo Server implementations, with the security patch becoming available in versions 4.11.20 and later.
Organizations should prioritize immediate remediation of this vulnerability by upgrading their QNAP devices to the patched versions of Kazoo Server. The mitigation strategy should include comprehensive network monitoring to detect potential exploitation attempts and implementation of web application firewalls to filter malicious payloads. Security teams should also conduct thorough vulnerability assessments of their QNAP deployments to identify any unpatched systems and establish monitoring protocols for suspicious user activities. Additionally, user education regarding the risks of clicking untrusted links and attachments remains crucial in defending against exploitation attempts that may leverage this vulnerability. The remediation process should involve systematic rollout of patches across all affected devices while maintaining detailed audit trails to verify successful implementation and monitor for any residual security concerns.