The Linksys RE7000 is a Wi-Fi range extender used worldwide by both individuals and businesses to strengthen and extend wireless coverage. Its purpose is to improve Wi-Fi access in areas where weak signals are typically experienced, providing better connectivity for devices. It is often deployed in homes, offices, and public spaces that require reliable network performance over a larger area. The product's versatility allows users to overcome obstacles such as walls and interference that typically hinder signal performance. By increasing the range of Wi-Fi networks, the Linksys RE7000 enhances internet experiences through consistent connections. Its user-friendly setup and integration capabilities make it a popular choice for people aiming to optimize their networking environment.
The command injection vulnerability in Linksys RE7000 could allow an attacker to execute arbitrary commands on the device. This flaw is particularly dangerous as it enables attackers to gain elevated rights, including administrative privileges. Users of affected versions (v2.0.9, v2.0.11, and v2.0.15) are at risk if this vulnerability remains unpatched. By exploiting this issue, attackers can tamper with device settings, access sensitive data, and overall control the device. Such vulnerabilities expose devices to a higher risk of exploitation and can compromise the integrity, confidentiality, and availability of the data transmitted through the device. Implementing security patches and firmware updates is crucial to mitigate these risks.
In the vulnerability details, the critical point lies in the "AccessControlList" parameter within the HTTP request interaction with the endpoint /goform/AccessControl. By manipulating this parameter, attackers can use command injection to execute unauthorized instructions on vulnerable devices. The process involves sending specially crafted payloads through PUT requests that manipulate device functionality. It opens pathways for accessing restricted areas or operations, potentially logging device processes, or accessing device memory. The vulnerability operates over HTTP requests and is contingent upon specific conditions within the HTTP response status codes and response body content, making it exploitable under certain operational circumstances.
Exploitation of this vulnerability can lead to severe effects such as unauthorized access to the device administrator functions. Attackers can potentially overwrite or manipulate vital system configurations, compromising network security and performance. The worst-case scenario involves the complete takeover of the device, leading to persistent unauthorized access or even the creation of a network foothold for further attacks. Data interception, modification, or exfiltration are additional risks associated with this vulnerability. Such compromises could disrupt the service and lead to data breaches affecting privacy and information security. Recovery from such exploits may require extensive remediation efforts including system reset or replacement.
REFERENCES
- Update the device firmware to the latest version provided by the manufacturer as it might contain patches for known vulnerabilities.
- Regularly check for patches and apply them promptly to protect against potential exploits.
- Restrict access to the device's management interface, ensuring it is accessible only from trusted networks.
- Enable logging and monitor for unusual activities suggesting unauthorized access attempts.
- Configure strong, unique passwords for administration accounts to withstand unauthorized access attempts.
- Consider network segmentation to isolate the device, reducing the impact of potential compromises.
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