CVE-2021-47777: Build Smart ERP SQLi Vulnerability

CVE-2021-47777 Overview

CVE-2021-47777 is an unauthenticated SQL injection vulnerability affecting Build Smart ERP version 21.0817. The vulnerability exists in the eidValue parameter of the login validation endpoint, allowing attackers to inject stacked SQL queries without prior authentication. This flaw enables malicious actors to manipulate database queries and potentially extract or modify sensitive database information.

Critical Impact
Unauthenticated attackers can exploit this SQL injection vulnerability to access, extract, or modify database contents in Build Smart ERP systems without valid credentials.

Affected Products

Build Smart ERP 21.0817

Discovery Timeline

2026-01-15 - CVE-2021-47777 published to NVD
2026-01-16 - Last updated in NVD database

Technical Details for CVE-2021-47777

Vulnerability Analysis

This vulnerability represents a classic SQL injection flaw (CWE-89) in the authentication mechanism of Build Smart ERP. The login validation endpoint fails to properly sanitize user-supplied input in the eidValue parameter before incorporating it into database queries. The application accepts stacked SQL queries, which significantly increases the severity of this vulnerability as it allows attackers to execute multiple SQL statements in a single request.

The network-accessible nature of this vulnerability means that any attacker with network access to the affected ERP system can attempt exploitation without requiring any prior authentication or user interaction. This is particularly concerning for ERP systems which typically contain sensitive business data including financial records, employee information, and proprietary business intelligence.

Root Cause

The root cause of CVE-2021-47777 is improper input validation and lack of parameterized queries in the login validation endpoint. The eidValue parameter is directly concatenated into SQL queries without sanitization, allowing attackers to break out of the intended query context and inject arbitrary SQL commands. The support for stacked queries further exacerbates this issue by enabling execution of completely separate SQL statements.

Attack Vector

The attack vector is network-based, targeting the login validation endpoint of Build Smart ERP. An attacker can craft malicious HTTP requests containing SQL injection payloads in the eidValue parameter. The vulnerability description indicates that time-based blind SQL injection techniques using payloads like ;WAITFOR DELAY '0:0:3'-- are effective, suggesting the application runs on a Microsoft SQL Server backend.

Attackers can leverage this injection point to:

Enumerate database structure and contents through blind SQL injection techniques
Extract sensitive data including user credentials and business information
Modify or delete database records
Potentially escalate to operating system command execution depending on database configuration

For technical exploitation details, refer to the Exploit-DB #50445 advisory.

Detection Methods for CVE-2021-47777

Indicators of Compromise

Unusual SQL Server activity including unexpected WAITFOR DELAY commands in query logs
Multiple failed or suspicious login attempts to the ERP system containing SQL syntax
Database query logs showing semicolons, comment sequences (--), or SQL keywords in authentication parameters
Unexpected data access patterns or bulk data extraction from the ERP database

Detection Strategies

Implement web application firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests
Monitor authentication endpoint access logs for unusual parameter values or encoding
Configure database audit logging to capture and alert on suspicious query patterns
Deploy network intrusion detection signatures for SQL injection attack patterns targeting ERP systems

Monitoring Recommendations

Enable detailed logging on the Build Smart ERP login validation endpoint
Configure database audit policies to track queries containing potential injection payloads
Set up alerting for time-based SQL injection indicators such as abnormal query execution times
Monitor for unauthorized database schema queries or bulk data access operations

How to Mitigate CVE-2021-47777

Immediate Actions Required

Restrict network access to Build Smart ERP systems to trusted IP ranges only
Implement a web application firewall with SQL injection protection rules
Enable detailed logging on authentication endpoints for forensic analysis
Review database permissions to ensure least privilege access

Patch Information

Organizations should contact Ribccs (the vendor) directly for patch availability and upgrade guidance. Additional product information is available at the Ribccs Solution Overview page. Until a patch is available, implement the workarounds described below to reduce exposure.

Workarounds

Deploy a web application firewall (WAF) configured to block SQL injection patterns
Implement network segmentation to isolate the ERP system from untrusted networks
Use a reverse proxy to filter and validate input before it reaches the application
Monitor and alert on suspicious authentication attempts in real-time
Consider disabling external network access to the ERP system if business requirements permit

bash

# Example WAF rule for blocking common SQL injection patterns
# ModSecurity rule to detect and block SQL injection attempts
SecRule ARGS "@rx (\;|\-\-|waitfor\s+delay|xp_cmdshell)" \
    "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Detected'"