CVE-2018-14747 in QTS
Summary
by MITRE
NULL Pointer Dereference vulnerability in QTS 4.3.5 build 20181013, QTS 4.3.4 build 20181008, QTS 4.3.3 build 20180829, QTS 4.2.6 build 20180829 and earlier versions could allow remote attackers to crash the NAS media server.
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Analysis
by VulDB Data Team • 04/15/2020
The CVE-2018-14747 vulnerability represents a critical null pointer dereference flaw affecting QTS (QNAP Turbo Server) operating system versions including 4.3.5, 4.3.4, 4.3.3, and 4.2.6 along with earlier releases. This vulnerability specifically targets the NAS media server component, creating a condition where the system attempts to access a null memory pointer during normal operation. The flaw stems from inadequate input validation and error handling within the media server daemon that processes network requests, particularly those related to media streaming protocols. When maliciously crafted requests are sent to the vulnerable system, the media server process encounters a null pointer reference that results in an immediate crash and subsequent service disruption.
The technical implementation of this vulnerability involves the media server component failing to properly validate incoming requests before processing them, leading to a scenario where a null pointer is dereferenced during the request handling cycle. This type of vulnerability falls under CWE-476 which specifically addresses null pointer dereference conditions, making it a classic example of improper error handling in network services. The vulnerability is particularly concerning because it operates at the application layer and can be exploited remotely without requiring authentication or prior access to the system. Attackers can trigger the crash by sending specially crafted media protocol requests that cause the media server to attempt to access memory locations that have not been properly initialized or allocated.
From an operational standpoint, this vulnerability poses significant risk to organizations relying on QNAP NAS devices for media services, as it can result in complete service disruption and potential denial of access to critical media content. The remote exploit capability means that attackers can target these devices from anywhere on the internet, making the vulnerability particularly dangerous for businesses that expose their NAS systems to public networks. The crash typically results in immediate service unavailability requiring manual intervention to restart the media server process, which can lead to extended downtime and potential data access issues for legitimate users. The vulnerability affects not just individual devices but entire network media infrastructures that depend on these NAS systems for content delivery.
Security professionals should implement immediate mitigations including applying the latest QNAP firmware updates that address this specific null pointer dereference issue. Network segmentation and firewall rules should be configured to restrict access to media server ports from trusted networks only, while monitoring systems should be deployed to detect unusual patterns of requests that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1499 which covers network denial of service attacks, and organizations should consider implementing intrusion detection systems that can identify the specific patterns associated with this type of null pointer dereference exploitation. Additionally, regular security assessments and vulnerability scanning should be conducted to identify any other potentially affected components within the QTS environment, as similar null pointer dereference vulnerabilities may exist in other system components.