Import Spreadsheets from Microsoft Excel <= 10.1.4 - Authenticated (Editor+) Arbitrary File Upload
Strategic Overview
- Status
- Patched in 10.1.5
- Affected Plugin
- SpreadsheetConverter Calculator
- Affected Version
<= 10.1.4- CVSS
- 9.1Critical
- Weakness type
- CWE-434 · Unrestricted Upload of File with Dangerous Type
- CVE
CVE-2024-38734
At a glance
CVE-2024-38734 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the SpreadsheetConverter Calculator WordPress plugin, affecting versions <= 10.1.4. It carries a CVSS score of 9.1 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Editor level or above. The issue is fixed in version 10.1.5; sites on affected versions should update now. Disclosed July 2024, reported by Peng Zhou.
Vulnerability Overview
The Import Spreadsheets from Microsoft Excel plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in all versions up to, and including, 10.1.4. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-434: Unrestricted Upload of File with Dangerous Type
Reaching this weakness in SpreadsheetConverter Calculator <= 10.1.4 takes an account at Editor level or above. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.
If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For SpreadsheetConverter Calculator the fix is 10.1.5: builds <= 10.1.4 are affected, anything from 10.1.5 onward is not.
Remediation
Update to version 10.1.5, or a newer patched version
How does WordSec protect against this?
An attacker needs Editor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: SpreadsheetConverter Calculator 10.1.5 closes this, and updating the plugin is the step that ends it.
- Firewall
- Scanner
- Alerts
External References
Related records
Other vulnerabilities in SpreadsheetConverter Calculator
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