CVE-2024-39945 in NVR4XXX
Summary
by MITRE • 07/31/2024
A vulnerability has been found in Dahua products. After obtaining the administrator's username and password, the attacker can send a carefully crafted data packet to the interface with vulnerabilities, causing the device to crash.
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Analysis
by VulDB Data Team • 08/20/2024
This vulnerability affects Dahua security devices and represents a denial of service condition that can be exploited by authenticated attackers who possess administrative credentials. The flaw manifests when maliciously crafted data packets are transmitted to vulnerable interfaces, resulting in device system instability and potential complete service disruption. The vulnerability stems from insufficient input validation mechanisms within the device's network processing components, allowing malformed data to trigger unexpected system behavior. This type of vulnerability aligns with CWE-129, which addresses insufficient input validation, and falls under the broader category of improper input validation flaws that can lead to system instability and denial of service conditions. The attack vector requires prior authentication, making it less accessible than unauthenticated exploits but still presenting significant operational risk to organizations relying on Dahua security infrastructure.
The technical implementation of this vulnerability involves the device's failure to properly sanitize incoming network data before processing. When administrative credentials are compromised, attackers can leverage this weakness to send specifically crafted packets that exploit buffer handling or state management issues within the device's network stack. The resulting device crash can occur immediately upon packet reception or may manifest after a delay, depending on the specific implementation details of the affected Dahua products. This behavior demonstrates characteristics consistent with CWE-476, which covers null pointer dereference conditions, or potentially CWE-121, which addresses stack-based buffer overflow scenarios. The vulnerability affects the device's ability to maintain continuous operation and can lead to complete service interruption, impacting security monitoring and access control functions.
Operational impact assessment reveals that organizations using affected Dahua devices face significant risk of service disruption, particularly in environments where continuous security monitoring is critical. The vulnerability can be exploited to create temporary or persistent denial of service conditions, potentially leaving security infrastructure unavailable during critical periods. Attackers can leverage this weakness to disrupt security operations, potentially creating windows of opportunity for additional attacks or bypassing security controls. The impact extends beyond simple service interruption as it can affect the integrity of security monitoring systems and potentially compromise the overall security posture of affected networks. Organizations may experience operational downtime, increased incident response overhead, and potential regulatory compliance issues if security infrastructure becomes unavailable due to this vulnerability. The attack requires administrative credentials, suggesting that internal threats or credential compromise scenarios represent primary risk vectors.
Mitigation strategies should focus on immediate credential management and network segmentation to limit potential exploitation. Organizations should implement strict access controls and ensure administrative credentials are properly secured through multi-factor authentication and regular credential rotation. Network-level protections including firewall rules and intrusion detection systems can help detect and block malicious packet patterns targeting this vulnerability. Device firmware updates from Dahua should be applied immediately upon availability to address the underlying validation issues. Additional protective measures include implementing network monitoring to detect unusual traffic patterns and establishing incident response procedures for handling potential exploitation attempts. Security teams should conduct comprehensive vulnerability assessments to identify all affected Dahua devices within their environments and prioritize remediation efforts based on risk exposure. The mitigation approach should align with ATT&CK technique T1499, which covers network denial of service, and T1566, which addresses credential harvesting and theft, emphasizing the need for both preventive and detective controls.