CVE-2022-28481 in CSV-Safe Gem
Summary
by MITRE • 05/01/2022
CSV-Safe gem < 3.0.0 doesn't filter out special characters which could trigger CSV Injection.
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Analysis
by VulDB Data Team • 05/04/2022
The CSV-Safe gem vulnerability represents a critical security flaw in software designed to handle comma-separated values data processing. This vulnerability affects versions prior to 3.0.0 and stems from insufficient input validation mechanisms that fail to properly sanitize special characters within data fields. The issue manifests when applications process user-supplied data that contains potentially malicious CSV injection sequences, creating a pathway for unauthorized data manipulation and potential system compromise.
The technical root cause of this vulnerability aligns with CWE-15, which addresses improper neutralization of special elements used in data queries. The flaw occurs because the gem does not adequately filter out characters such as equals sign, plus, minus, and at symbols that can be interpreted by spreadsheet applications as formula commands. When these characters appear at the beginning of CSV data fields, they trigger automatic execution of formulas within spreadsheet applications like Microsoft Excel or Google Sheets, enabling attackers to inject malicious code that can execute arbitrary commands or exfiltrate data from the victim's system.
From an operational impact perspective, this vulnerability creates significant risk for applications that process user-generated CSV data or integrate with external data sources containing untrusted input. Attackers can exploit this weakness by crafting malicious CSV files that, when opened in spreadsheet applications, execute unauthorized commands on the victim's machine. The attack vector typically involves placing formula commands at the beginning of CSV fields, such as =cmd|' /C calc'!, which when processed by vulnerable applications can trigger command execution. This represents a classic example of a server-side vulnerability that becomes exploitable through client-side application behavior, creating a unique attack surface that extends beyond traditional web application boundaries.
The vulnerability's exploitation aligns with several ATT&CK techniques including T1059 for command and script injection, and T1068 for exploit for privilege escalation. Organizations using vulnerable versions of the CSV-Safe gem face potential data breaches, system compromise, and unauthorized access to sensitive information. The impact extends beyond immediate exploitation as attackers can use this vulnerability to establish persistent access or escalate privileges within compromised systems. The vulnerability affects any application that relies on the gem for CSV processing and data validation, making it particularly dangerous in enterprise environments where CSV data exchange is common.
Mitigation strategies should focus on immediate version upgrades to CSV-Safe gem version 3.0.0 or later, which includes proper input filtering and sanitization mechanisms. Organizations should implement comprehensive input validation at multiple layers including application-level sanitization, database-level filtering, and network-level monitoring for suspicious CSV data patterns. Additional protective measures include configuring spreadsheet applications to disable automatic formula execution, implementing web application firewalls to detect and block malicious CSV injection attempts, and establishing robust data validation protocols that explicitly check for special character sequences. Regular security assessments and penetration testing should be conducted to ensure that all applications utilizing CSV processing capabilities remain protected against similar vulnerabilities. The remediation process should also include comprehensive staff training on secure coding practices and awareness of CSV injection attack patterns to prevent future occurrences.