CVE-2021-46418 Scanner

Telesquare TLR-2855KS6 is a high-performance router often used in enterprise environments to ensure reliable and secure networking solutions. It is commonly deployed by network administrators in diverse organizational setups to manage connected devices efficiently and maintain steadfast data communication. The router is known for its robustness, multi-functional capability, and ability to handle large volumes of traffic, which makes it a popular choice among tech firms and businesses that demand high concurrency and high-speed network interfaces. Its ease of configuration, coupled with its versatile usage capabilities, allows it to be customized according to specific enterprise demands. Despite its sophisticated features, regular updates and careful management are essential to maintain the security integrity of the Telesquare TLR-2855KS6. Users must ensure proper configuration to prevent unauthorized access and potential exploitation.

The Arbitrary File Upload vulnerability in the Telesquare TLR-2855KS6 router arises when unauthorized users exploit the PUT HTTP method within its web server. This vulnerability allows an attacker to create or upload files without authorization, potentially leading to unauthorized script execution. The vulnerability is significant because it could be exploited without needing user interaction or even requiring authentication, thereby making it potentially harmful. This issue has been given a CVSS score of 7.5, categorizing it as high severity due to the potential impact on confidentiality and integrity, allowing the execution of arbitrary code within the context of the affected system. Monitoring and timely patching are necessary to prevent attackers from exploiting this vulnerability. Enterprises using the router should remain vigilant for updates and advisories from the vendor, Telesquare.

Technical details of this vulnerability indicate that the arbitrary file creation occurs via a manipulated PUT HTTP request to the path /cgi-bin within the web server of the TLR-2855KS6. By sending a specially crafted PUT request, attackers can create files such as CGI scripts in the server's directory, which are subsequently executable via a GET request. This creates an avenue for malicious code execution on the host device. Successful exploitation depends primarily on insufficient validation checks or controls in this part of the web service, allowing unauthorized file manipulations. The checks performed by the scanning mechanism include verifying HTTP status codes and server responses to ensure the risks are present and active. Resolving this issue is imperative to deter potential security breaches.

The potential effects of exploiting this vulnerability include unauthorized file creation and execution on the router, which could allow attackers to install backdoors, escalate privileges, or initiate denial-of-service attacks. An exploited system can lead to a loss of data integrity, unauthorized access to sensitive information, or control over the network router, potentially compromising the entire network's security. Organizations use these routers as network gateways and may find their networks exposed to further internal threats if this vulnerability is left unpatched. Comprehensive knowledge of affected systems is crucial to safeguard network environments effectively. Businesses should safeguard such equipment with regular security assessments and updates.

REFERENCES

• http://packetstormsecurity.com/files/166674/Telesquare-TLR-2855KS6-Arbitrary-File-Creation.html
• https://nvd.nist.gov/vuln/detail/CVE-2021-46418