CVE-2022-29322 in DIR-816 A2
Summary
by MITRE • 05/10/2022
D-Link DIR-816 A2_v1.10CNB04 was discovered to contain a stack overflow via the IPADDR and nvmacaddr parameters in /goform/form2Dhcpip.
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Analysis
by VulDB Data Team • 05/12/2022
The vulnerability identified as CVE-2022-29322 affects D-Link DIR-816 A2_v1.10CNB04 wireless routers, representing a critical stack overflow flaw within the device's web interface handling mechanism. This issue manifests through the improper validation of user-supplied input parameters during DHCP IP configuration operations, specifically targeting the IPADDR and nvmacaddr parameters within the /goform/form2Dhcpip endpoint. The stack overflow vulnerability stems from insufficient bounds checking and input sanitization routines that fail to properly validate the length and content of incoming data, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on the affected device.
The technical exploitation of this vulnerability occurs when an attacker submits maliciously crafted input through the web form interface, particularly targeting the IPADDR and nvmacaddr fields. The device's firmware fails to implement proper input validation, allowing an attacker to overflow the stack buffer allocated for these parameters, potentially leading to arbitrary code execution with the privileges of the web server process. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security. The attack vector is remote and requires no authentication, making it particularly dangerous as it can be exploited by anyone with access to the device's network.
The operational impact of this vulnerability extends beyond simple code execution, as successful exploitation can lead to complete device compromise and potential network infiltration. An attacker who successfully exploits this vulnerability could gain unauthorized access to the router's administrative interface, modify network configurations, redirect traffic, or establish persistent backdoors. The vulnerability affects the device's core network functionality, potentially allowing attackers to intercept communications, perform man-in-the-middle attacks, or use the compromised device as a pivot point for further attacks within the local network. This aligns with ATT&CK technique T1021.001 for remote services and T1059.001 for command and scripting interpreter, as the vulnerability enables remote code execution and command injection capabilities.
Mitigation strategies for this vulnerability should include immediate firmware updates from D-Link, as the company has released patches addressing this specific issue. Network administrators should also implement network segmentation and access controls to limit exposure, while monitoring for suspicious network traffic patterns that might indicate exploitation attempts. Additional protective measures include disabling unnecessary web management interfaces, implementing strong authentication mechanisms, and conducting regular security assessments of network infrastructure. The vulnerability demonstrates the importance of input validation and proper memory management in embedded systems, highlighting the need for robust security practices throughout the software development lifecycle to prevent similar issues in network device firmware implementations.