CVE-2020-29390 : What You Need to Know

Zeroshell 3.9.3 contains a command injection vulnerability that could allow an unauthenticated attacker to execute system commands.

Understanding CVE-2020-29390

Zeroshell 3.9.3 is susceptible to a command injection vulnerability that can be exploited by an unauthenticated attacker.

What is CVE-2020-29390?

The vulnerability exists in the /cgi-bin/kerbynet StartSessionSubmit parameter, enabling attackers to execute system commands using shell metacharacters and the %0a character.

The Impact of CVE-2020-29390

This vulnerability allows unauthenticated attackers to run arbitrary system commands, potentially leading to unauthorized access and control of the affected system.

Technical Details of CVE-2020-29390

Zeroshell 3.9.3 is affected by a command injection vulnerability with the following details:

Vulnerability Description

The vulnerability in the /cgi-bin/kerbynet StartSessionSubmit parameter permits the execution of system commands by malicious actors.

Affected Systems and Versions

Product: Zeroshell 3.9.3
Vendor: N/A
Version: N/A

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious commands using shell metacharacters and the %0a character.

Mitigation and Prevention

To address CVE-2020-29390, consider the following steps:

Immediate Steps to Take

Implement network segmentation to limit the impact of potential attacks.
Monitor and restrict access to the vulnerable parameter.
Apply strict input validation to prevent command injections.

Long-Term Security Practices

Regularly update Zeroshell to the latest version to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Stay informed about security advisories and patches released by Zeroshell.
Apply security patches promptly to mitigate the risk of exploitation.