CVE-2019-11029 : Exploit Details and Defense Strategies

Mirasys VMS versions prior to V7.6.1 and 8.x prior to V8.3.2 are vulnerable to a Directory Traversal issue in the Download() method of AutoUpdateService in SMServer.exe. This vulnerability allows unauthorized access to sensitive system files, posing a significant risk to system confidentiality.

Understanding CVE-2019-11029

This CVE details a security vulnerability in Mirasys VMS that could be exploited by attackers to access and download critical system files without authentication.

What is CVE-2019-11029?

The vulnerability in Mirasys VMS versions before V7.6.1 and 8.x before V8.3.2 allows attackers to perform Directory Traversal using the Download() method of AutoUpdateService in SMServer.exe. By manipulating the ..\ sequence, attackers can access and download system files like SAM-database backups and Web.config files.

The Impact of CVE-2019-11029

Exploiting this vulnerability can lead to unauthorized access to sensitive system files, compromising the confidentiality of the affected system. Attackers can potentially retrieve critical data without the need for prior authentication.

Technical Details of CVE-2019-11029

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the mishandling of the Download() method of AutoUpdateService in SMServer.exe, enabling Directory Traversal. Attackers can leverage this flaw to download various system files without authentication, including sensitive backups and configuration files.

Affected Systems and Versions

Mirasys VMS versions prior to V7.6.1
Mirasys VMS 8.x versions before V8.3.2

Exploitation Mechanism

Attackers exploit the vulnerability by using the ..\ sequence to navigate through system directories and access critical files without requiring authentication.

Mitigation and Prevention

Protecting systems from CVE-2019-11029 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Implement network segmentation to limit access to vulnerable services.
Monitor system logs for any suspicious activities indicating exploitation attempts.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate users and administrators about secure coding practices and the risks of directory traversal attacks.

Patching and Updates

Regularly check for security advisories from Mirasys VMS and apply patches as soon as they are available to prevent exploitation of this vulnerability.