CVE-2019-9858 : Security Advisory and Response

A vulnerability in Horde Groupware Webmail versions 5.2.22 and 5.2.17 allows for remote code execution due to unsanitized user input in the image upload functionality.

Understanding CVE-2019-9858

This CVE identifies a critical security flaw in Horde Groupware Webmail that can be exploited by attackers to execute remote code.

What is CVE-2019-9858?

The vulnerability in Horde Groupware Webmail versions 5.2.22 and 5.2.17 enables remote code execution by manipulating unsanitized user input during image uploads.

The Impact of CVE-2019-9858

Exploiting this vulnerability allows attackers to insert a PHP backdoor within the web root, potentially compromising the entire system's security.

Technical Details of CVE-2019-9858

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from the class "Horde_Form_Type_image" in the file "Type.php" that mishandles image uploads, allowing attackers to manipulate the file path and execute remote code.

Affected Systems and Versions

Horde Groupware Webmail versions 5.2.22 and 5.2.17

Exploitation Mechanism

The vulnerability stems from unsanitized user input in the "object[photo][img][file]" POST parameter, enabling attackers to save malicious files within the web root.

Mitigation and Prevention

Protecting systems from CVE-2019-9858 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Horde Groupware Webmail to the latest secure version.
Implement input validation and sanitization to prevent malicious file uploads.
Monitor and restrict file system access permissions.

Long-Term Security Practices

Conduct regular security audits and penetration testing.
Educate users on safe file upload practices and potential risks.

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security.