CVE-2018-20927 : Vulnerability Insights and Analysis

An escape from jailshell is possible in cPanel versions prior to 70.0.23 due to inaccurate parsing of the crontab (SEC-382).

Understanding CVE-2018-20927

cPanel before 70.0.23 allows jailshell escape because of incorrect crontab parsing (SEC-382).

What is CVE-2018-20927?

CVE-2018-20927 is a vulnerability in cPanel versions before 70.0.23 that enables an escape from jailshell due to inaccurate parsing of the crontab (SEC-382).

The Impact of CVE-2018-20927

This vulnerability allows unauthorized users to break out of the restricted jailshell environment, potentially leading to unauthorized access and malicious activities.

Technical Details of CVE-2018-20927

Vulnerability Description

The vulnerability arises from incorrect crontab parsing in cPanel versions prior to 70.0.23, enabling users to escape the jailshell environment.

Affected Systems and Versions

Product: cPanel
Vendor: cPanel
Versions affected: Prior to 70.0.23

Exploitation Mechanism

The inaccurate parsing of the crontab allows users to manipulate commands and escape the jailshell, gaining unauthorized access.

Mitigation and Prevention

Immediate Steps to Take

Upgrade cPanel to version 70.0.23 or later to mitigate the vulnerability.
Monitor system logs for any suspicious activities indicating a potential escape from jailshell.

Long-Term Security Practices

Regularly update and patch cPanel to ensure the latest security fixes are in place.
Implement strong access controls and user permissions to limit unauthorized access.

Patching and Updates

Apply security patches and updates provided by cPanel to address vulnerabilities and enhance system security.