CVE-2021-38674 is a cross-site scripting (XSS) vulnerability that affects QNAP's QTS, QuTS hero, and QuTScloud products. This vulnerability allows remote attackers to inject malicious code into these systems. The severity of this vulnerability is classified as medium, with a CVSS score of 4.2. Organizations using affected products should prioritize remediation to mitigate potential risks.
The vulnerability was published on January 7, 2022, and has been marked as modified following the identification of a fix. QNAP has addressed this vulnerability in QuTS hero h4.5.4.1771 build 20210825 and later, QTS 4.5.4.1787 build 20210910 and later, and QuTScloud c4.5.7.1864 and later. Organizations utilizing these versions or older are particularly at risk.
Risk to organizations includes the potential for unauthorized access and manipulation of data. Attackers may leverage this vulnerability to carry out phishing attacks or to escalate their privileges within the network. Given the nature of the vulnerability and the potential impact, organizations must address this issue promptly.
Organizations should prioritize patching immediately. Ensuring that systems are updated to the latest versions will significantly mitigate the risk associated with this vulnerability.
Vulnerability Details
The official description of this vulnerability indicates that it allows for remote code injection through cross-site scripting. The CVSS score of 4.2 indicates a medium severity, classified under CVSS 3.1. The attack vector is network-based with a high attack complexity, requiring user interaction for successful exploitation.
The affected products include QTS, QuTS hero, and QuTScloud from QNAP. The vulnerability is categorized under CWE-79, which refers to improper neutralization of input during web page generation ('cross-site scripting').
Technical Analysis
The root cause of the vulnerability stems from inadequate validation of user-supplied input in web pages rendered by the affected products. Attackers can exploit this weakness by crafting malicious scripts that are then executed in the context of users interacting with the affected applications.
The attack vector is primarily network-based, necessitating that the attacker have access to the same network as the target. This vulnerability requires low privileges, as no authentication is necessary for exploitation, but it does require user interaction to trigger the attack.
Confidentiality and integrity impacts are both low, meaning that while sensitive information may not be directly leaked, the integrity of the application can be compromised, allowing the attacker to manipulate data or deceive users.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-38674 is significant as it could potentially allow attackers to execute arbitrary scripts in the context of a user’s session. This could lead to unauthorized actions on behalf of the user, including data theft or service disruption.
Organizations that deploy QNAP systems should consider this vulnerability particularly concerning due to the potential blast radius. If exploited, attackers could gain footholds in organizational networks, leading to further attacks or data breaches.
Urgency assessment based on the CVSS score suggests that organizations should address this vulnerability in priority patch cycles to reduce the risk of exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions include QTS prior to 4.5.4.1787, QuTS hero prior to h4.5.4.1771, and QuTScloud prior to c4.5.7.1864. Organizations running these versions should upgrade immediately to mitigate the risk.
Mitigation & Remediation
Organizations should patch affected systems to the latest versions: QuTS hero h4.5.4.1771 build 20210825 or later, QTS 4.5.4.1787 build 20210910 or later, and QuTScloud c4.5.7.1864 or later. If patches cannot be applied immediately, consider implementing web application firewalls to filter out malicious scripts and enhance monitoring for suspicious activity.
For more information on effective remediation strategies, organizations can refer to our penetration testing services to proactively identify vulnerabilities in their systems.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual patterns, such as unexpected script execution or unauthorized access attempts. Additionally, behavioral anomalies in user sessions may indicate exploitation.
AppSecure Threat Intelligence Insight
CVE-2021-38674 exemplifies the persistent risks associated with XSS vulnerabilities in widely used applications. Security teams should recognize the importance of regular updates and monitoring to defend against potential exploitation. This incident serves as a reminder of the necessity of comprehensive security assessments.
For further insights on vulnerability management, organizations can explore our vulnerability management program and best practices for continuous security improvement.
In conclusion, staying informed about vulnerabilities like CVE-2021-38674 is crucial for effective risk management. Organizations should consider implementing penetration testing methodologies to identify and address security weaknesses proactively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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