CVE-2022-43973 : Security Advisory and Response
Learn about CVE-2022-43973, an arbitrary code execution vulnerability in Linksys WRT54GL Wireless-G Broadband Router allowing attackers to run commands as root. Find out the impact, affected systems, and mitigation steps.
An arbitrary code execution vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006, allowing authenticated attackers to run malicious commands as root.
Understanding CVE-2022-43973
This section will delve into the details of the CVE-2022-43973 vulnerability, understanding its impact, technical details, and mitigation strategies.
What is CVE-2022-43973?
The CVE-2022-43973 vulnerability involves an arbitrary code execution flaw in the Linksys WRT54GL Wireless-G Broadband Router, enabling attackers to execute unauthorized commands as a privileged user.
The Impact of CVE-2022-43973
The vulnerability poses a high risk, as authenticated attackers with admin privileges can exploit it remotely over the network, potentially leading to the execution of malicious commands on the Linux operating system as root.
Technical Details of CVE-2022-43973
In this section, we will explore the specifics of the CVE-2022-43973 vulnerability, including the vulnerability description, affected systems and versions, and exploitation mechanism.
Vulnerability Description
The Check_TSSI function within the httpd binary allows attackers to input unvalidated data, which is used in crafting system commands, leading to arbitrary code execution.
Affected Systems and Versions
The Linksys WRT54GL Wireless-G Broadband Router firmware versions equal to or less than 4.30.18.006 are impacted by this vulnerability.
Exploitation Mechanism
Attackers with authenticated access and administrator privileges can leverage this vulnerability by sending a malicious POST request to /apply.cgi, enabling them to run arbitrary commands on the underlying Linux OS as root.
Mitigation and Prevention
This section will cover immediate steps, long-term security practices, and the importance of timely patching and updates.
Immediate Steps to Take
Immediately upgrade the firmware of the affected Linksys WRT54GL routers to a version that addresses this vulnerability. Additionally, restrict network access to trusted entities and review administrator privileges.
Long-Term Security Practices
In the long term, establish regular security audits, update processes, and employee training programs to enhance overall cybersecurity posture.
Patching and Updates
Regularly check for firmware updates from Linksys and apply them promptly to ensure that the system is protected against known vulnerabilities.