CVE-2025-44835 in DIR-816
Summary
by MITRE • 05/01/2025
D-Link DIR-816 A2V1.1.0B05 was found to contain a command injection in iptablesWebsFilterRun, which allows remote attackers to execute arbitrary commands via shell.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability identified as CVE-2025-44835 affects D-Link DIR-816 A2 routers running firmware version 1.1.0B05 and potentially other variants within the same product line. This issue represents a critical command injection flaw that resides within the iptablesWebsFilterRun functionality of the device's web interface. The vulnerability stems from insufficient input validation and sanitization within the router's web management system, creating an avenue for remote attackers to inject malicious commands directly into the underlying operating system through the web interface.
The technical flaw manifests when the device processes user-supplied input through the iptablesWebsFilterRun function without proper sanitization or escaping mechanisms. This allows an attacker to craft malicious input that gets executed as shell commands on the router's operating system. The vulnerability is particularly dangerous because it enables remote code execution without requiring authentication, making it accessible to anyone who can reach the router's web interface. This represents a classic command injection vulnerability that aligns with CWE-77, which specifically addresses improper neutralization of special elements used in commands.
The operational impact of this vulnerability is severe and multifaceted. An unauthenticated remote attacker can gain complete control over the affected router, potentially leading to full network compromise. The attacker could modify firewall rules, redirect traffic, install malicious software, or use the device as a pivot point for attacking other systems within the network. Additionally, the compromised device could be used to launch further attacks against external networks, making it a potential vector for botnet recruitment. This vulnerability directly maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1071.004 for application layer protocol.
Mitigation strategies should include immediate firmware updates from D-Link, which should address the input validation issues and implement proper sanitization of user inputs. Network segmentation and firewall rules should be implemented to restrict access to the router's web interface to only trusted administrative networks. Additional protective measures include disabling unnecessary services, implementing strong authentication mechanisms, and monitoring network traffic for suspicious activities. Organizations should also consider deploying intrusion detection systems to monitor for exploitation attempts and maintain detailed network logs for forensic analysis. The vulnerability demonstrates the critical importance of proper input validation in web applications and the potential consequences when such protections are absent.