CVE-2019-12593 in Mail Server
Summary
by MITRE
IceWarp Mail Server through 10.4.4 is prone to a local file inclusion vulnerability via webmail/calendar/minimizer/index.php?style=..%5c directory traversal.
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Analysis
by VulDB Data Team • 08/25/2025
The vulnerability identified as CVE-2019-12593 affects IceWarp Mail Server versions up to 10.4.4 and represents a critical local file inclusion flaw that stems from improper input validation within the webmail/calendar/minimizer/index.php script. This vulnerability specifically manifests when the application processes the style parameter without adequate sanitization, allowing attackers to manipulate directory traversal sequences using the ..%5c encoding pattern. The %5c represents the backslash character in URL encoding, which when combined with directory traversal sequences creates a path traversal attack vector that can be exploited to access arbitrary files on the server filesystem.
The technical exploitation of this vulnerability occurs through the manipulation of the style parameter in the minimizer/index.php endpoint, where the application fails to properly validate or sanitize user-supplied input before incorporating it into file system operations. When an attacker crafts a malicious request containing directory traversal sequences, the application processes these inputs without sufficient validation, potentially allowing access to sensitive files including configuration files, database credentials, or other system resources that should remain protected from unauthorized access. This weakness directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities.
The operational impact of this vulnerability extends beyond simple file access as it can enable attackers to execute arbitrary code on the affected server, potentially leading to full system compromise. An attacker could leverage this vulnerability to read sensitive configuration files containing database credentials, SSL certificates, or administrative access details that would otherwise be protected. Additionally, the ability to include arbitrary files could allow for the execution of malicious code, potentially enabling persistent access to the server infrastructure. This vulnerability particularly affects organizations using IceWarp Mail Server in environments where administrative access to the underlying file system is not properly restricted, creating a significant risk for email server administrators who may not have adequate network segmentation or access controls in place.
Organizations should implement multiple layers of defense to mitigate this vulnerability, beginning with immediate patching of the IceWarp Mail Server to version 10.4.5 or later where this issue has been resolved. Network segmentation and access controls should be reviewed to ensure that the webmail interface is not directly exposed to untrusted networks, and that appropriate firewall rules are implemented to restrict access to the vulnerable endpoint. Input validation should be strengthened across all web applications to ensure that directory traversal sequences are properly detected and rejected, implementing proper parameter sanitization and validation techniques that align with the principles outlined in the OWASP Top Ten. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for command and script injection, while also mapping to T1566 for credential access through exploitation of web applications. Regular security assessments and web application firewalls should be deployed to detect and block similar attack patterns, as this vulnerability demonstrates how insufficient input validation can create persistent security risks in email server infrastructure.