CVE-2019-11829 : Exploit Details and Defense Strategies

A vulnerability related to OS command injection has been discovered in the drivers_syno_import_user.php file of Synology Calendar versions prior to 2.3.1-0617. This vulnerability enables attackers to remotely execute arbitrary commands by manipulating the 'X-Real-IP' header in a malicious manner.

Understanding CVE-2019-11829

This CVE involves an OS command injection vulnerability in Synology Calendar.

What is CVE-2019-11829?

CVE-2019-11829 is a security vulnerability found in Synology Calendar versions before 2.3.1-0617, allowing remote attackers to execute arbitrary commands via a manipulated 'X-Real-IP' header.

The Impact of CVE-2019-11829

The vulnerability has a CVSS base score of 7.3, indicating a high severity level. Attackers can exploit this flaw to execute commands remotely.

Technical Details of CVE-2019-11829

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability lies in the drivers_syno_import_user.php file of Synology Calendar, enabling remote command execution through the 'X-Real-IP' header manipulation.

Affected Systems and Versions

Product: Calendar
Vendor: Synology
Versions Affected: < 2.3.1-0617 (unspecified/custom version)

Exploitation Mechanism

The vulnerability allows attackers to execute arbitrary commands remotely by tampering with the 'X-Real-IP' header.

Mitigation and Prevention

Protecting systems from CVE-2019-11829 is crucial for maintaining security.

Immediate Steps to Take

Update Synology Calendar to version 2.3.1-0617 or higher to mitigate the vulnerability.
Monitor network traffic for any suspicious activity related to 'X-Real-IP' headers.

Long-Term Security Practices

Regularly update software and firmware to patch known vulnerabilities.
Implement network security measures to detect and prevent command injection attacks.

Patching and Updates

Apply security patches provided by Synology promptly to address CVE-2019-11829.