External risk intelligence

QNAP QTS Cross-Site Scripting Vulnerability

CVE advisoryKnown Exploit

CVE-2018-19943

A cross-site scripting flaw in QNAP QTS allows remote attackers to inject malicious code, potentially impacting system integrity and data confidentiality for affected organizations. This external vulnerability has been observed in the wild, posing a business risk.

4Halo Surface Signal

Cross-site Scripting

Qnap Qts

before 4.2.64.3.1.0013 to before 4.3.3.12524.3.4 to before 4.3.4.12824.3.6 to before 4.3.6.12634.4.0 to before 4.4.1.12614.4.2 to before 4.4.2.12704.2.6

External exposure likelihood

Halo Surface Signal score for CVE-2018-19943

This vulnerability affects QNAP QTS, the operating system for network-attached storage devices. These devices are frequently deployed as internet-facing management portals or gateways for remote file access, making the web-based management interface commonly reachable from the public internet.

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in QNAP's QTS operating system allows remote attackers to inject malicious code through a cross-site scripting flaw. This could potentially lead to unauthorized actions or data exposure within affected systems. Organizations using the QNAP QTS operating system may be at risk if this vulnerability is exploited.

  • QNAP QTS operating system
  • Cross-site scripting flaw
  • Malicious code injection

Attack Path

How an attacker could exploit the issue

This vulnerability allows remote attackers to inject malicious code into affected systems. The attack begins when an attacker gains access to an organization's network. From there, the attacker can trick a user into triggering the vulnerability, leading to the compromise of system control or data.

  • Network access is required.
  • Attacker gains unauthorized access.
  • User interaction triggers code injection.

Live Threat

Current exploitation, exposure, and threat context

A cross-site scripting vulnerability exists in QNAP QTS, allowing remote attackers to inject malicious code. The Common Vulnerability Scoring System (CVSS) rates this vulnerability as medium severity with a base score of 5.4. While an attacker can exploit this by having network access and low privileges, user interaction is required for successful exploitation. The vulnerability has been noted in the Known Exploited Vulnerabilities Catalog, indicating it has been actively exploited.

  • Likely attacker skill level: Low
  • Required access or conditions: Network access, low privileges, user interaction
  • Business risk or urgency: Medium severity, actively exploited

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

A cross-site scripting vulnerability in QNAP QTS could allow remote attackers to inject malicious code, impacting affected organizations by potentially compromising system integrity and data confidentiality. This could lead to unauthorized actions or data manipulation within the QNAP network-attached storage devices. The vulnerability is classified as external, meaning it can be exploited over a network.

  • Identify exposed QNAP devices.
  • Reduce exposure or isolate affected systems.
  • Apply vendor fixes and validate.
  • Monitor for related activity.

Frequently asked questions

What is the nature of the CVE-2018-19943 vulnerability affecting QNAP QTS?

CVE-2018-19943 is a cross-site scripting (XSS) vulnerability in QNAP's QTS operating system. This flaw allows remote attackers to inject malicious code into affected systems, potentially leading to unauthorized actions or data exposure. The vulnerability is classified as external, meaning it can be exploited over a network.

How is the CVE-2018-19943 vulnerability technically described, and what weakness class does it fall under?

This vulnerability is a cross-site scripting flaw, categorized under CWE-79 and CWE-80. It allows for the injection of malicious code into QNAP QTS, which can compromise system integrity and data confidentiality.

What is the trigger path and scope of the CVE-2018-19943 vulnerability in QNAP QTS?

Exploitation of this vulnerability requires network access and low privileges for the attacker. A user must interact with a malicious element to trigger the code injection, which then affects the system's scope. This means that while an attacker can initiate the attack remotely, user action is necessary for successful compromise.

What is the relevance of CVE-2018-19943, considering it's in the Known Exploited Vulnerabilities Catalog?

CVE-2018-19943 has a medium severity rating with a CVSS base score of 5.4. Its inclusion in the Known Exploited Vulnerabilities Catalog signifies that it has been actively exploited in the wild, increasing the urgency for organizations to address this threat.

What practical steps should be taken to respond to the CVE-2018-19943 vulnerability?

Organizations should first identify any exposed QNAP devices running the affected QTS versions. It is recommended to reduce their exposure or isolate them if possible. Applying the vendor-provided fixes for QTS and validating their implementation is crucial. Continuous monitoring for any related malicious activity is also advised.

References