CVE-2020-37087: Easy Transfer Wifi XSS Vulnerability

CVE-2020-37087 Overview

Easy Transfer Wifi Transfer v1.7 for iOS contains a persistent cross-site scripting (XSS) vulnerability that allows remote attackers to inject malicious scripts by manipulating the oldPath, newPath, and path parameters in Create Folder and Move/Edit functions. Attackers can exploit improper input validation via POST requests to execute arbitrary JavaScript in the context of the mobile web application.

Critical Impact

Successful exploitation allows attackers to inject and persistently store malicious JavaScript that executes in the context of other users accessing the affected mobile web interface, potentially leading to session hijacking, credential theft, or unauthorized actions.

Affected Products

• Easy Transfer Wifi Transfer v1.7 for iOS

Discovery Timeline

• 2026-02-03 - CVE CVE-2020-37087 published to NVD
• 2026-02-04 - Last updated in NVD database

Technical Details for CVE-2020-37087

Vulnerability Analysis

This persistent cross-site scripting vulnerability exists due to insufficient input sanitization in the Easy Transfer Wifi Transfer iOS application's web interface. The application fails to properly validate and encode user-supplied input in the oldPath, newPath, and path parameters when processing Create Folder and Move/Edit operations.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents a fundamental failure in applying proper output encoding or input validation. When users submit specially crafted values through POST requests to these functions, the malicious payload is stored server-side and subsequently rendered without proper sanitization when the affected page is viewed.

Root Cause

The root cause of this vulnerability is improper input validation in the file management functions of the Easy Transfer Wifi Transfer application. The oldPath, newPath, and path parameters accept user-supplied input without adequate sanitization or encoding. When this data is stored and later displayed in the web interface, the application fails to neutralize potentially dangerous characters, allowing embedded JavaScript to execute in the victim's browser context.

Attack Vector

The attack is network-based and requires low complexity to execute. An attacker with authenticated access to the application can craft malicious POST requests containing JavaScript payloads within the vulnerable parameters. The exploitation flow involves:

1. The attacker identifies the Create Folder or Move/Edit functionality within the application's web interface
2. A POST request is crafted with malicious JavaScript embedded in the oldPath, newPath, or path parameters
3. The application stores the malicious input without proper validation
4. When another user accesses the affected page, the stored malicious script executes in their browser session

Technical details and proof-of-concept information can be found in the Exploit-DB #48395 entry and the Vulnerability Lab Report #2223.

Detection Methods for CVE-2020-37087

Indicators of Compromise

• Unusual JavaScript content stored within folder names or file paths in the application
• POST requests to Create Folder or Move/Edit endpoints containing script tags or JavaScript event handlers
• Browser console errors or unexpected script execution when accessing file management pages
• Abnormal network traffic patterns indicating data exfiltration through injected scripts

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block XSS payloads in POST request parameters
• Monitor application logs for suspicious characters such as <script>, javascript:, or event handlers like onerror and onclick in path-related parameters
• Deploy Content Security Policy (CSP) headers to detect and report inline script execution attempts
• Utilize browser-based XSS auditors where available to identify potential script injection

Monitoring Recommendations

• Enable detailed logging for all file management operations including Create Folder and Move/Edit functions
• Set up alerts for unusual patterns in the oldPath, newPath, and path parameters
• Monitor for unexpected outbound connections that may indicate data exfiltration via injected scripts
• Regularly audit stored file and folder metadata for potentially malicious content

How to Mitigate CVE-2020-37087

Immediate Actions Required

• Update Easy Transfer Wifi Transfer to the latest available version if a patch has been released
• Restrict network access to the application's web interface to trusted networks only
• Review and audit existing folder names and file paths for signs of injected malicious content
• Consider using alternative file transfer applications until a security patch is available

Patch Information

Users should check the Apple App Store Listing for the latest version of the application. Review the VulnCheck iOS XSS Advisory for vendor patch status and additional guidance.

Workarounds

• Limit application access to trusted users and networks only to reduce exposure
• Implement network-level filtering to block requests containing common XSS payload patterns
• Consider disabling the web-based interface and using alternative file transfer methods until patched
• Deploy a reverse proxy with XSS filtering capabilities in front of the application's web interface