CVE-2018-12303 in NAS OS
Summary
by MITRE
Cross-site scripting in filebrowser in Seagate NAS OS version 4.3.15.1 allows attackers to execute JavaScript via directory names.
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Analysis
by VulDB Data Team • 09/15/2023
The vulnerability identified as CVE-2018-12303 represents a critical cross-site scripting flaw within the filebrowser component of Seagate NAS OS version 4.3.15.1. This issue stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize directory names before rendering them in web interfaces. The flaw exists in the web-based management interface where users can navigate through file directories, making it accessible to both authenticated and unauthenticated attackers who can manipulate directory names to inject malicious javascript code. The vulnerability specifically affects the filebrowser functionality which displays directory names in HTML contexts without proper sanitization, creating an avenue for persistent cross-site scripting attacks that can compromise user sessions and potentially lead to full system compromise.
The technical implementation of this vulnerability demonstrates a classic XSS weakness where directory names containing malicious script payloads are rendered directly into web pages without appropriate HTML encoding or sanitization. When users browse directories or view file listings, the system fails to escape special characters in directory names, allowing attackers to inject javascript code that executes in the context of other users' browsers. This type of vulnerability maps directly to CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security. The attack vector is particularly concerning because directory names are often user-controlled and can be manipulated through various means including file uploads, renaming operations, or even automated scripts that create malicious directory structures.
The operational impact of CVE-2018-12303 extends beyond simple script execution to potentially enable more sophisticated attacks within networked environments. An attacker who successfully exploits this vulnerability can execute arbitrary javascript code in the browser context of authenticated users, which may allow for session hijacking, credential theft, or redirection to malicious sites. In the context of network-attached storage systems, this vulnerability represents a significant threat to enterprise security as NAS devices often contain sensitive organizational data and may be used for internal network access. The attack can be leveraged to escalate privileges or gain unauthorized access to shared resources, potentially compromising the entire network infrastructure. According to ATT&CK framework, this vulnerability aligns with T1059.007 - Command and Scripting Interpreter: JavaScript, and T1566.002 - Phishing: Spearphishing Attachment, as attackers can use the XSS to deliver malicious payloads or establish persistent access.
Mitigation strategies for CVE-2018-12303 should focus on implementing proper input validation and output encoding mechanisms throughout the application stack. Organizations should immediately update to the latest Seagate NAS OS versions that contain patches addressing this vulnerability, as the manufacturer has released security updates to resolve the issue. Additionally, network administrators should implement web application firewalls that can detect and block suspicious script payloads, and establish strict directory naming policies that prevent the creation of potentially malicious directory structures. The implementation of Content Security Policy headers can provide an additional layer of protection by restricting script execution and preventing unauthorized code injection. Security monitoring should include detection of unusual directory creation patterns and automated scanning for malicious directory names. Regular security assessments of network-attached storage systems are essential to identify similar vulnerabilities, and system administrators should disable unnecessary web-based management interfaces when possible to reduce attack surface. Organizations should also consider implementing network segmentation to limit the potential impact of successful exploitation and establish incident response procedures specifically addressing cross-site scripting vulnerabilities in storage systems.