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CVE-2023-28760: Unauthenticated Root Access Exploit in TP-Link AX1800 WiFi 6 Router

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Overview

A critical vulnerability has been identified in TP-Link’s AX1800 WiFi 6 Router (Archer AX21) devices that allows unauthenticated attackers to execute arbitrary code as the root user. This vulnerability can potentially lead to a system compromise or data leakage, affecting both individual and enterprise users. It is vital that users and administrators understand this threat and apply the recommended mitigations.

Vulnerability Summary

CVE ID: CVE-2023-28760
Severity: High (CVSS: 7.5)
Attack Vector: Local Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized access, arbitrary code execution, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

TP-Link AX1800 WiFi 6 Router (Archer AX21) | All versions prior to the security patch

How the Exploit Works

An attacker within the same local area network (LAN) can exploit this vulnerability by sending a malicious request to the router’s `minidlnad` service. This request includes a manipulated `db_dir` field, which allows the attacker to modify `files.db`. This modification can trigger a stack-based buffer overflow in `minidlna-1.1.2/upnpsoap.c`, enabling the attacker to execute arbitrary code as root. Notably, this attack requires a USB flash drive to be connected to the router.

Conceptual Example Code

# Attackers could potentially use a shell command similar to this:
$ echo 'malicious_code' > /mnt/USB/files.db

Mitigation Guidance

Users of the affected TP-Link router should immediately apply the security patch provided by the vendor. If the patch cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure. Users are also advised to disconnect any USB drives from the router until the patch has been applied.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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