CVE-2021-3317 : Vulnerability Insights and Analysis

KLog Server through 2.4.1 is vulnerable to authenticated command injection through async.php, which calls shell_exec() on the source parameter value.

Understanding CVE-2021-3317

This CVE describes a vulnerability in KLog Server version 2.4.1 that allows authenticated users to inject commands.

What is CVE-2021-3317?

CVE-2021-3317 refers to the authenticated command injection vulnerability in KLog Server version 2.4.1. The issue arises in the async.php script that executes shell commands based on user input.

The Impact of CVE-2021-3317

Exploiting this vulnerability could allow authenticated attackers to execute arbitrary commands on the server, leading to unauthorized access, data theft, or disruption of services.

Technical Details of CVE-2021-3317

The following technical aspects of CVE-2021-3317 provide more insight into the vulnerability.

Vulnerability Description

The vulnerability in async.php of KLog Server 2.4.1 allows authenticated users to perform command injection by manipulating the 'source' parameter, resulting in unauthorized command execution.

Affected Systems and Versions

KLog Server versions up to 2.4.1 are affected by this vulnerability.

Exploitation Mechanism

By sending a crafted request with malicious commands in the 'source' parameter, an authenticated attacker can execute arbitrary commands on the server.

Mitigation and Prevention

To address CVE-2021-3317 and enhance system security, the following measures are recommended:

Immediate Steps to Take

Disable the affected async.php script or restrict access to it.
Apply the vendor-supplied patches or updates promptly.

Long-Term Security Practices

Implement least privilege principles for user access.
Conduct regular security assessments and penetration testing.

Patching and Updates

Ensure the KLog Server is updated to version 2.4.2 or higher to mitigate the authenticated command injection vulnerability.