CSV Injection in Poweradmin Log Export

Executive Summary

This vulnerability affects Poweradmin, a web-based DNS administration tool for PowerDNS server. Versions prior to 4.2.4 and 4.3.3 have a CSV Injection (Formula Injection) issue in the log export functionality. Specifically, user-controlled data in the username field is written to exported CSV files without sanitizing characters that trigger formulas (=, +, -, @). When an administrator exports activity logs and opens the CSV file in spreadsheet applications like Microsoft Excel, LibreOffice Calc, or Google Sheets, any malicious formula embedded in the username is executed.

This can be exploited to perform phishing attacks against administrators or to exfiltrate data.

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Impact Analysis

The vulnerability can lead to execution of malicious formulas when exported CSV files are opened by administrators in spreadsheet applications. This can result in phishing attacks targeting administrators or unauthorized data exfiltration.

Because the vulnerability involves executing arbitrary formulas, it can compromise the confidentiality and integrity of data managed through Poweradmin.

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Detection Guidance

This vulnerability involves CSV Injection in the log export functionality of Poweradmin versions prior to 4.2.4 and 4.3.3, specifically through the username field in exported CSV files.

Detection can focus on examining exported CSV log files for the presence of formula trigger characters (=, +, -, @) at the start of username fields, which could indicate potential injection.

Since no specific commands or detection tools are provided in the available information, a manual inspection or custom script to scan exported CSV files for usernames starting with these characters can be used.

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Mitigation Strategies

The immediate mitigation step is to upgrade Poweradmin to version 4.2.4 or 4.3.3, where this CSV Injection vulnerability has been patched.

Additionally, avoid opening exported CSV log files directly in spreadsheet applications without sanitizing or validating the username fields to prevent execution of malicious formulas.

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Compliance Impact

The vulnerability allows user-controlled data to be executed as formulas in exported CSV files, potentially leading to phishing attacks or data exfiltration when administrators open these files. This could result in unauthorized disclosure or manipulation of sensitive information.

Such unauthorized data exposure or manipulation may impact compliance with standards and regulations like GDPR or HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

However, the provided information does not explicitly detail the compliance implications or specific regulatory impacts.

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