CVE-2023-7208: Critical Buffer Overflow Vulnerability in Totolink X2000R_V2 2.0.0-B20230727.10434

Overview

In an ever-evolving digital landscape, cybersecurity threats are a constant concern for businesses and individuals alike. One such threat that has recently surfaced is a critical vulnerability found in Totolink’s X2000R_V2 2.0.0-B20230727.10434. This security flaw, identified as CVE-2023-7208, affects the function formTmultiAP of the file /bin/boa and has the potential to lead to a system compromise or data leakage if exploited. This vulnerability is particularly concerning due to the lack of response from the vendor, prompting the need for immediate attention and mitigative measures.

Vulnerability Summary

CVE ID: CVE-2023-7208
Severity: Critical, CVSS score of 8.0
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Totolink X2000R_V2 | 2.0.0-B20230727.10434

How the Exploit Works

The vulnerability lies in the formTmultiAP function of the /bin/boa file. A carefully crafted manipulation can lead to a buffer overflow, allowing potential threat actors to execute arbitrary code or cause a denial of service (DoS) condition. With no reported requirement for user interaction or privileges, this vulnerability is especially dangerous as it can be exploited remotely by unauthenticated attackers.

Conceptual Example Code

While no specific exploit code has been made public, a theoretical exploit could look similar to this:

POST /bin/boa HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
formTmultiAP={ "malicious_payload": "A".repeat(5000) }

In this example, the “A”.repeat(5000) represents a buffer overflow attack, where the attacker sends more data than the buffer can handle, causing it to overflow and potentially allowing the attacker to execute arbitrary code.

Mitigation Guidance

Due to the lack of response from the vendor, immediate mitigation steps are crucial. Users should consider deploying a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can help detect and block attempts to exploit this vulnerability. Users are advised to keep a close watch on any updates from the vendor and apply patches as soon as they become available.