CVE-2022-28895 in DIR-882
Summary
by MITRE • 05/10/2022
A command injection vulnerability in the component /setnetworksettings/IPAddress of D-Link DIR882 DIR882A1_FW130B06 allows attackers to escalate privileges to root via a crafted payload.
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Analysis
by VulDB Data Team • 05/12/2022
The command injection vulnerability identified as CVE-2022-28895 resides within the D-Link DIR882 router firmware, specifically targeting the /setnetworksettings/IPAddress endpoint. This flaw represents a critical security weakness that enables remote attackers to execute arbitrary commands with root privileges on affected devices. The vulnerability stems from insufficient input validation and sanitization within the web interface component responsible for handling network settings configuration. Attackers can exploit this weakness by crafting malicious payloads that are directly executed within the router's command shell without proper authorization checks or sanitization measures.
The technical implementation of this vulnerability falls under CWE-77, which categorizes command injection flaws in software applications. The flaw manifests when the device processes user-supplied input through the IPAddress parameter in the setnetworksettings endpoint, allowing attackers to inject operating system commands that are subsequently executed with the highest privileges available on the device. This particular implementation allows for privilege escalation from regular user access to root level execution, effectively granting complete control over the affected router. The vulnerability exists due to improper handling of special characters and command delimiters within the input processing pipeline, enabling attackers to bypass authentication mechanisms and directly manipulate the underlying operating system.
From an operational standpoint, this vulnerability presents a severe risk to network security infrastructure as it allows attackers to gain complete administrative control over affected routers. Once exploited, compromised devices can serve as entry points for broader network infiltration, enabling attackers to perform man-in-the-middle attacks, redirect traffic, or establish persistent backdoors. The impact extends beyond individual device compromise to potentially affect entire network segments that rely on the compromised router for connectivity. Network defenders face significant challenges in detecting such attacks as they typically appear as legitimate administrative operations within router logs, making them difficult to distinguish from authorized maintenance activities. The vulnerability's remote exploitability means that attackers do not require physical access to the device or network proximity to carry out successful attacks.
Mitigation strategies for CVE-2022-28895 should prioritize immediate firmware updates from D-Link to address the root cause of the command injection vulnerability. Organizations must implement network segmentation and access controls to limit exposure of critical network infrastructure to untrusted networks. Network monitoring solutions should be configured to detect unusual patterns in router configuration changes and command execution activities. Additionally, implementing web application firewalls and input validation controls can help prevent malicious payloads from reaching vulnerable endpoints. Security teams should also conduct regular vulnerability assessments of network devices and maintain up-to-date inventories to ensure all affected systems receive timely patches. The ATT&CK framework categorizes this vulnerability under T1059.001 for command and scripting interpreter and T1566 for phishing, as attackers may use this vulnerability to establish persistent access and escalate privileges within compromised networks.