CVE-2019-20071 in DL4323
Summary
by MITRE
On Netis DL4323 devices, CSRF exists via form2logaction.cgi to delete all logs.
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Analysis
by VulDB Data Team • 03/18/2024
The vulnerability identified as CVE-2019-20071 represents a cross-site request forgery flaw discovered in Netis DL4323 network devices. This security weakness resides within the form2logaction.cgi web interface component, which fails to properly validate or authenticate requests originating from external sources. The vulnerability allows authenticated attackers to manipulate the device's logging functionality through maliciously crafted web requests that leverage the device's existing administrative privileges. The specific attack vector enables an attacker to delete all system logs, which constitutes a significant compromise of the device's audit trail and operational integrity.
From a technical perspective, the flaw manifests as the absence of proper anti-CSRF mechanisms within the affected web interface. When a user accesses the form2logaction.cgi endpoint, the device does not implement sufficient validation to ensure that the request originates from a legitimate administrative session. This omission creates a pathway for attackers to construct malicious web pages or exploit payloads that, when executed by an authenticated user, trigger unauthorized log deletion operations. The vulnerability operates at the application layer and exploits the trust relationship between the web interface and the underlying device management functions.
The operational impact of this vulnerability extends beyond simple log deletion, as it compromises the device's ability to maintain security audit trails and operational records. System administrators rely on comprehensive logging for security monitoring, forensic analysis, and compliance verification. When all logs can be deleted through a CSRF attack, it becomes extremely difficult to detect unauthorized access attempts, security incidents, or malicious activities that occurred prior to the attack. This vulnerability undermines the fundamental security posture of the network device and creates blind spots in security monitoring capabilities.
The flaw aligns with CWE-352, which specifically addresses Cross-Site Request Forgery vulnerabilities, and represents a classic example of how insufficient input validation and authentication checks can create exploitable conditions. From an attacker's perspective, this vulnerability fits within the ATT&CK framework under the technique T1566 for initial access and T1070 for indicator of compromise removal. The attack requires minimal technical expertise to exploit, as it leverages existing administrative sessions rather than requiring additional authentication credentials. Network defenders should consider this vulnerability as part of a broader threat landscape where attackers seek to disable security monitoring capabilities as part of their attack lifecycle.
Mitigation strategies should include implementing proper anti-CSRF tokens within the web interface, ensuring that all administrative functions require explicit session validation, and deploying network segmentation to limit access to administrative interfaces. Device vendors should also consider implementing rate limiting and additional authentication factors to prevent unauthorized operations. Regular security audits of web interfaces and prompt patch deployment are essential for maintaining device security. Organizations should also implement network monitoring to detect unusual patterns in administrative access and logging activities that might indicate exploitation attempts.