Severity: HIGH
Description: A command injection vulnerability in the firmware_update command, in the device's restricted telnet interface, allows an authenticated attacker to execute arbitrary commands as root.
CVSS Score: N/A
D
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1. Risk Assessment
The vulnerability identified as CVE-2023-0127 is a command injection flaw in the firmware_update command of the restricted telnet interface on the D-Link DWL-2600AP device running firmware version v4.2.0.17. This vulnerability allows an authenticated attacker to execute arbitrary commands with root privileges, granting them full control over the affected device. The nature of this vulnerability is highly critical due to the potential for complete system compromise.
The likelihood of exploitation is moderate, as it requires an authenticated attacker to access the restricted telnet interface. However, the ease of exploitation is high once authentication is achieved, as the attacker can inject malicious commands directly into the firmware_update process. The potential impacts are severe: confidentiality is compromised as sensitive data can be accessed, integrity is violated as the attacker can modify system configurations or firmware, and availability is at risk as the attacker could disrupt services or render the device inoperable.
2. Potential Attack Scenarios
An attacker with valid credentials to the restricted telnet interface of the D-Link DWL-2600AP device could exploit this vulnerability to gain root access. The attack vector begins with the attacker logging into the telnet interface using stolen or brute-forced credentials. Once authenticated, the attacker crafts a malicious payload and injects it into the firmware_update command. This payload could include commands to download and execute a remote shell, modify system files, or install persistent backdoors.
For example, the attacker could inject a command to download a malicious script from an external server and execute it with root privileges. This script could then be used to exfiltrate sensitive data, disrupt network operations, or pivot to other devices on the network. The potential outcomes include complete device compromise, data breaches, and widespread network disruption.
3. Mitigation Recommendations
Immediate action is required to mitigate this vulnerability. The first step is to apply the latest firmware update provided by D-Link, as it likely includes a patch for this issue. If no patch is available, disable the telnet interface and restrict access to the device’s management interface to trusted IP addresses only. Additionally, implement strong authentication mechanisms, such as multi-factor authentication, to reduce the risk of credential compromise.
Regularly monitor and audit logs for suspicious activity, particularly unauthorized access attempts or unusual commands executed via the telnet interface. For further guidance, refer to the advisory published by Tenable at https://www.tenable.com/security/research/tra-2023-1.
4. Executive Summary
CVE-2023-0127 is a critical command injection vulnerability in the D-Link DWL-2600AP device’s firmware_update command, allowing authenticated attackers to execute arbitrary commands as root. This poses significant risks to confidentiality, integrity, and availability, potentially leading to data breaches, system compromise, and service disruptions.
The vulnerability is moderately likely to be exploited but is highly impactful once exploited. Attackers can leverage this flaw to gain full control over the device, exfiltrate sensitive data, or disrupt network operations. Immediate mitigation is essential, including applying firmware updates, disabling the telnet interface, and implementing strong authentication measures. Addressing this vulnerability is critical to safeguarding business operations and protecting sensitive information.