CVE-2022-28958 in DIR-816L
Summary
by MITRE • 05/18/2022
D-Link DIR816L_FW206b01 was discovered to contain a remote code execution (RCE) vulnerability via the value parameter at shareport.php.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/26/2022
The CVE-2022-28958 vulnerability represents a critical remote code execution flaw affecting D-Link DIR816L routers running firmware version 206b01. This vulnerability resides within the web interface of the device and specifically targets the shareport.php script, which processes user input through the value parameter. The flaw enables attackers to execute arbitrary code on the affected device with the privileges of the web server, potentially leading to complete system compromise and unauthorized access to network resources.
The technical exploitation of this vulnerability stems from inadequate input validation within the shareport.php script. When the value parameter is submitted through HTTP requests, the application fails to properly sanitize or filter user-supplied data before processing it. This classic input validation failure creates an entry point for malicious actors to inject and execute arbitrary commands on the router's operating system. The vulnerability aligns with CWE-77 and CWE-94, which respectively address improper neutralization of special elements used in command execution and improper execution of code. The attack vector is particularly concerning as it requires no authentication, making it accessible to remote attackers who can exploit the flaw from outside the network perimeter.
From an operational perspective, this vulnerability poses severe risks to network security and integrity. Successful exploitation allows attackers to gain full control over the affected router, enabling them to modify network settings, redirect traffic, install malicious software, or use the device as a pivot point for further attacks within the local network. The compromised device could be used to launch man-in-the-middle attacks, monitor network traffic, or serve as a command and control node for botnet activities. Organizations using affected D-Link DIR816L devices face potential data breaches, network disruption, and compliance violations, particularly in regulated environments where network device security is paramount.
Security mitigation strategies should prioritize immediate firmware updates from D-Link, as the vendor has released patches addressing this vulnerability. Network administrators should also implement network segmentation and access controls to limit exposure, while monitoring network traffic for suspicious activity. Additional defensive measures include disabling unnecessary services, implementing firewall rules to restrict access to the router's web interface, and conducting regular vulnerability assessments of network infrastructure. The ATT&CK framework categorizes this vulnerability under T1059.007 for command and scripting interpreter, as attackers would utilize command execution capabilities to gain system control. Organizations should also consider deploying intrusion detection systems to monitor for exploitation attempts and maintain comprehensive incident response procedures to address potential compromise scenarios.