CVE-2021-43164 : Exploit Details and Defense Strategies

This CVE pertains to a Remote Code Execution (RCE) vulnerability in Ruijie Networks Ruijie RG-EW Series Routers up to ReyeeOS 1.55.1915 / EW_3.0(1)B11P55 that can be exploited via the updateVersion function in /cgi-bin/luci/api/wireless.

Understanding CVE-2021-43164

This CVE describes a critical RCE vulnerability in specific Ruijie Networks routers.

What is CVE-2021-43164?

The CVE-2021-43164 vulnerability allows remote attackers to execute arbitrary code on the target system using a specially crafted request.

The Impact of CVE-2021-43164

The impact of this vulnerability is severe, as attackers can take complete control of affected routers, compromise data, and potentially launch further attacks within the network.

Technical Details of CVE-2021-43164

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability exists in the updateVersion function of certain Ruijie Networks routers, enabling attackers to execute malicious code remotely.

Affected Systems and Versions

Affected systems: Ruijie Networks Ruijie RG-EW Series Routers
Vulnerable versions: Up to ReyeeOS 1.55.1915 / EW_3.0(1)B11P55

Exploitation Mechanism

Exploitation involves sending specially crafted requests to the vulnerable router's updateVersion function, allowing remote code execution.

Mitigation and Prevention

Understanding how to mitigate and prevent exploits is crucial.

Immediate Steps to Take

Disable remote access to the router where possible.
Implement strong firewall rules to filter and block malicious traffic.
Regularly monitor router logs for any suspicious activity.

Long-Term Security Practices

Keep router firmware up to date with the latest security patches.
Conduct regular security audits on network devices to identify and remediate vulnerabilities.

Patching and Updates

Stay informed about security advisories from Ruijie Networks and apply relevant patches promptly.