CWE-1236 - Improper Neutralization of Formula Elements in a CSV File

Weakness Name

Improper Neutralization of Formula Elements in a CSV File

Description

The product saves user-provided information into a Comma-Separated Value (CSV) file, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as a command when the file is opened by a spreadsheet product.

User-provided data is often saved to traditional databases. This data can be exported to a CSV file, which allows users to read the data using spreadsheet software such as Excel, Numbers, or Calc. This software interprets entries beginning with '=' as formulas, which are then executed by the spreadsheet software. The software's formula language often allows methods to access hyperlinks or the local command line, and frequently allows enough characters to invoke an entire script. Attackers can populate data fields which, when saved to a CSV file, may attempt information exfiltration or other malicious activity when automatically executed by the spreadsheet software.

Common Consequences

Related Weaknesses

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')High