CVE-2022-27294 in DIR-619 Ax
Summary
by MITRE • 04/11/2022
D-Link DIR-619 Ax v1.00 was discovered to contain a stack overflow in the function formWlanWizardSetup. This vulnerability allows attackers to cause a Denial of Service (DoS) via the webpage parameter.
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Analysis
by VulDB Data Team • 04/13/2022
The vulnerability identified as CVE-2022-27294 affects D-Link DIR-619 Ax v1.00 wireless routers and represents a critical stack overflow condition within the web interface handling logic. This flaw exists in the formWlanWizardSetup function which processes incoming web requests through the webpage parameter. The stack overflow occurs when the device fails to properly validate input length before copying data to a fixed-size buffer on the stack, creating a condition where maliciously crafted input can overwrite adjacent stack memory locations. This vulnerability falls under CWE-121 Stack-based Buffer Overflow, a well-documented weakness that has been exploited in numerous network device compromises. The affected device architecture processes web requests through a vulnerable web server component that does not implement proper bounds checking mechanisms.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable more sophisticated attack vectors. When an attacker sends a specially crafted request containing excessive input data to the webpage parameter, the stack overflow can cause the web server process to crash and restart, resulting in complete service disruption for legitimate users. The DoS condition affects the device's ability to handle legitimate web traffic, rendering the router inaccessible through its web interface and potentially disrupting network connectivity for all connected devices. This vulnerability is particularly concerning because it can be exploited remotely without authentication, making it a prime target for automated scanning and exploitation campaigns. The attack surface is widened by the fact that the vulnerability exists in the router's standard web management interface, which is typically accessible from both internal and external networks.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1210 Exploitation of Remote Services, where attackers leverage unpatched network services to gain control over network infrastructure. The stack overflow can be leveraged in combination with other vulnerabilities to potentially achieve arbitrary code execution, though the current analysis indicates it primarily functions as a denial of service vector. The vulnerability demonstrates poor input validation practices and inadequate memory management within the router's firmware implementation. Network security professionals should note that this issue affects legacy router models that may not receive regular security updates, making them particularly vulnerable to exploitation. The vulnerability also highlights the importance of implementing proper security controls such as web application firewalls and network segmentation to prevent unauthorized access to network infrastructure components.
Mitigation strategies for CVE-2022-27294 should include immediate firmware updates from D-Link to address the stack overflow condition in the formWlanWizardSetup function. Network administrators should implement network segmentation to isolate affected devices from critical network segments and deploy intrusion detection systems to monitor for exploitation attempts. The use of network access control lists and disabling unnecessary services can further reduce the attack surface. Security monitoring should focus on identifying unusual traffic patterns or repeated connection attempts to the router's web interface that may indicate exploitation attempts. Regular vulnerability assessments and network scanning should be conducted to identify similar issues in other network devices within the infrastructure. Additionally, implementing multi-factor authentication and strong access controls for router management interfaces can provide additional layers of protection against unauthorized access attempts.