CVE-2021-29005 : What You Need to Know

A vulnerability with insecure permission of the chmod command on rConfig server 3.9.6 allows the apache user to execute chmod as root without a password, potentially granting an attacker with low privilege root access on the server.

Understanding CVE-2021-29005

This article explores the impact, technical details, and mitigation strategies related to CVE-2021-29005.

What is CVE-2021-29005?

The CVE-2021-29005 vulnerability stems from insecure permissions in the chmod command on rConfig server 3.9.6. This flaw enables the apache user to execute chmod as root without requiring a password, thereby opening the door for an attacker with limited privileges to escalate and gain root access.

The Impact of CVE-2021-29005

Exploitation of this vulnerability poses a significant security risk as it allows unauthorized users to potentially gain full control over the affected server. By abusing the insecure permission settings, threat actors can elevate their privileges and perform malicious activities with root-level access.

Technical Details of CVE-2021-29005

Let's delve into the specific technical aspects of CVE-2021-29005 to better understand its implications.

Vulnerability Description

The vulnerability in rConfig server 3.9.6 enables the apache user to execute chmod as root without a password, facilitating unauthorized privilege escalation and root access on the server.

Affected Systems and Versions

This vulnerability affects rConfig server version 3.9.6, putting instances running this specific version at risk of exploitation through the insecure permission settings in the chmod command.

Exploitation Mechanism

Attackers with low privilege on the rConfig server can leverage the insecure permission of the chmod command to execute it as root without needing a password. This exploitation tactic allows threat actors to gain unauthorized root access on the server.

Mitigation and Prevention

To address CVE-2021-29005 and enhance the security posture of rConfig server deployments, organizations should implement the following mitigation measures.

Immediate Steps to Take

Immediately restrict access and permissions related to the chmod command, ensuring that only authorized users can execute such operations. Consider updating to a patched version of rConfig server that addresses this vulnerability.

Long-Term Security Practices

Regularly review and enhance permission settings, user privileges, and access controls within the server environment to minimize the risk of unauthorized privilege escalation or root access.

Patching and Updates

Stay informed about security updates and patches released by rConfig to address CVE-2021-29005. Timely application of patches is crucial in remedying known vulnerabilities and reducing the likelihood of exploitation.