Learn about CVE-2021-20133, an absolute path traversal vulnerability in Quagga Services on D-Link DIR-2640 routers. Understand the impact, affected versions, and mitigation steps.
This article provides insights into CVE-2021-20133, focusing on the absolute path traversal vulnerability affecting Quagga Services on D-Link DIR-2640 routers.
Understanding CVE-2021-20133
This section delves into the details of the vulnerability and its implications.
What is CVE-2021-20133?
CVE-2021-20133 involves an absolute path traversal vulnerability in Quagga Services on D-Link DIR-2640 routers. Attackers with remote and authenticated access can manipulate the "message of the day" banner to access sensitive files on the system, potentially exposing hashed credentials, plaintext passwords, configuration files, and private keys.
The Impact of CVE-2021-20133
The vulnerability can lead to unauthorized access to critical information and may enable attackers to launch denial of service attacks against the Quagga services' command line interfaces.
Technical Details of CVE-2021-20133
This section provides technical insights into the vulnerability's description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
The flaw allows attackers to read unauthorized file contents by setting the system's banner. It arises from improper handling of filenames for virtual resources like "/dev/urandom".
Affected Systems and Versions
Quagga Services on D-Link DIR-2640 routers with versions less than or equal to 1.11B02 are affected by this vulnerability.
Exploitation Mechanism
Remote, authenticated attackers can exploit this vulnerability to read sensitive files and potentially launch denial of service attacks against the affected systems.
Mitigation and Prevention
This section presents measures to mitigate the risk posed by CVE-2021-20133.
Immediate Steps to Take
Users are advised to apply security patches and updates provided by the vendor. Additionally, limiting remote access to the affected systems can reduce the attack surface.
Long-Term Security Practices
Implementing network segmentation, regularly monitoring system logs for suspicious activities, and ensuring strong authentication mechanisms can enhance overall security.
Patching and Updates
Regularly updating the Quagga Services on D-Link DIR-2640 routers to versions that address the vulnerability is crucial to safeguarding systems against exploitation.