CVE-2021-20153 : Security Advisory and Response

A symlink vulnerability has been discovered in Trendnet AC2600 TEW-827DRU version 2.08B01, specifically affecting the bittorrent functionality, leading to a potential remote code execution threat on the device.

Understanding CVE-2021-20153

This vulnerability allows an attacker to exploit the bittorrent functionality through a malicious symlink, enabling them to download arbitrary files to the device's filesystem, potentially resulting in remote code execution.

What is CVE-2021-20153?

The CVE-2021-20153 vulnerability exists in Trendnet AC2600 TEW-827DRU version 2.08B01, where the bittorrent feature is susceptible to symlink attacks, allowing unauthorized downloads and possible remote code execution.

The Impact of CVE-2021-20153

If successfully exploited, this vulnerability could enable an attacker to insert a flash drive with a malicious symlink, leading to the download of arbitrary files onto the device and potential remote code execution, compromising the system's security.

Technical Details of CVE-2021-20153

This section delves into the specifics of the vulnerability, affected systems, and how the exploitation occurs.

Vulnerability Description

The symlink vulnerability in Trendnet AC2600 TEW-827DRU version 2.08B01's bittorrent functionality allows attackers to download arbitrary files, potentially leading to remote code execution.

Affected Systems and Versions

The specific version impacted is 2.08B01 of Trendnet AC2600 TEW-827DRU, exposing devices with this configuration to the symlink vulnerability within the bittorrent feature.

Exploitation Mechanism

By introducing a flash drive with a malicious symlink that the bittorrent client can write downloads to, attackers can execute unauthorized file downloads to specific system directories, resulting in potential remote code execution.

Mitigation and Prevention

Discover the steps to address and safeguard against CVE-2021-20153 to enhance device security.

Immediate Steps to Take

To mitigate the risk posed by the symlink vulnerability, disable the bittorrent functionality on the affected device until a patch or fix is available.

Long-Term Security Practices

Ensure regular security updates and monitoring of vendor communications for a permanent solution to prevent similar vulnerabilities and maintain device security.

Patching and Updates

Stay vigilant for official patches or updates from the vendor to secure the affected systems against potential symlink attacks.