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GHSA-534c-hcr7-67jg

GHSA-534c-hcr7-67jg · Kimai has an XXE Leading to Local File Read

This page contains facts from public vulnerability sources. Check the original advisory before updating.

### Summary Kimai uses [PHPSpreadsheet](https://github.com/PHPOffice/PhpSpreadsheet) for importing and exporting invoices. Recently, a [CVE](https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-ghg6-32f9-2jp7) was identified in PHPSpreadsheet, which could lead to an XXE vulnerability. ### Details Exploitation requires an Administrator account, allowing the upload of an `XLSX` template containing the payload. The vulnerability is triggered by the following code snippet: ```php // https://github.com/kimai/kimai/blob/b1903ba18359be16dd32ea9c40377c486498f082/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php#L41 public function render(InvoiceDocument $document, InvoiceModel $model): Response { $spreadsheet = IOFactory::load($document->getFilename()); $worksheet = $spreadsheet->getActiveSheet(); $entries = $model->getCalculator()->getEntries(); $sheetReplacer = $model->toArray(); $invoiceItemCount = \count($entries); if ($invoiceItemCount > 1) { $this->addTemplateRows($worksheet, $invoiceItemCount); } } ``` The `IOFactory::load` function utilizes `simplexml_load_string`, which has previously been demonstrated to be vulnerable to XXE attacks. While this is not directly an XXE in Kimai, it does however impact the latest stable version. ### PoC By uploading a malicious `XLSX` template, the payload will be triggered every time an invoice is generated. ```xml <?xml version="1.0" encoding='UTF-7' standalone="yes"?> +ADw-!DOCTYPE foo [ <!ENTITY % xxe SYSTEM "php://filter/......." > %xxe;]>..... ``` For a better a visibility, I will upload both a: - Malicious template sample for testing - An exported invoice, showing the contents of target file during the export. ### Impact Local File Read / RCE in edge cases where `phar://` can be utilized with [gadget chains](https://github.com/ambionics/phpggc) . [export.xlsx](https://github.com/user-attachments/files/16803913/export.xlsx) [sample_template.xlsx](https://github.com/user-attachments/files/16803916/sample_template.xlsx)

CVSS 8.5 · High · Fix available

Published
Updated

Stack: php

Affected products and versions

  • kimai/kimai Packagist

    Versions
    • 0.1
    • 0.2
    • 0.3
    • 0.4
    • 0.5
    • 0.6
    • 0.6.1
    • 0.7
    • 0.8
    • 0.8.1
    • 0.9
    • 1.0
    • 1.0.1
    • 1.1
    • 1.10
    • 1.10.1
    • 1.10.2
    • 1.11
    • 1.11.1
    • 1.12
    • 1.13
    • 1.14
    • 1.14.1
    • 1.14.2
    • 1.14.3
    • 1.15
    • 1.15.1
    • 1.15.2
    • 1.15.3
    • 1.15.4
    • 1.15.5
    • 1.15.6
    • 1.16
    • 1.16.1
    • 1.16.10
    • 1.16.2
    • 1.16.3
    • 1.16.4
    • 1.16.5
    • 1.16.6
    • 1.16.7
    • 1.16.8
    • 1.16.9
    • 1.17
    • 1.17.1
    • 1.18
    • 1.18.1
    • 1.18.2
    • 1.19
    • 1.19.1
    • 1.19.2
    • 1.19.3
    • 1.19.4
    • 1.19.5
    • 1.19.6
    • 1.19.7
    • 1.2
    • 1.20
    • 1.20.1
    • 1.20.2
    • 1.20.3
    • 1.20.4
    • 1.21.0
    • 1.22.0
    • 1.22.1
    • 1.23.0
    • 1.23.1
    • 1.24.0
    • 1.25.0
    • 1.26.0
    • 1.27.0
    • 1.28.0
    • 1.28.1
    • 1.29.0
    • 1.29.1
    • 1.3
    • 1.30.0
    • 1.30.1
    • 1.30.10
    • 1.30.11
    • 1.30.2
    • 1.30.3
    • 1.30.4
    • 1.30.5
    • 1.30.6
    • 1.30.7
    • 1.30.8
    • 1.30.9
    • 1.4
    • 1.4.1
    • 1.4.2
    • 1.5
    • 1.6
    • 1.6.1
    • 1.6.2
    • 1.7
    • 1.8
    • 1.9
    • 2.0.0
    • 2.0.0-alpha
    • 2.0.0-beta
    • 2.0.0-beta-2
    • 2.0.0-beta-3
    • 2.0.0-rc-1
    • 2.0.1
    • 2.0.10
    • 2.0.11
    • 2.0.12
    • 2.0.13
    • 2.0.14
    • 2.0.15
    • 2.0.16
    • 2.0.17
    • 2.0.18
    • 2.0.19
    • 2.0.2
    • 2.0.20
    • 2.0.21
    • 2.0.22
    • 2.0.23
    • 2.0.24
    • 2.0.25
    • 2.0.26
    • 2.0.27
    • 2.0.28
    • 2.0.29
    • 2.0.3
    • 2.0.30
    • 2.0.31
    • 2.0.32
    • 2.0.33
    • 2.0.34
    • 2.0.35
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.0.8
    • 2.0.9
    • 2.1.0
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.13.0
    • 2.14.0
    • 2.15.0
    • 2.16.0
    • 2.16.1
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.19.1
    • 2.2.0
    • 2.2.1
    • 2.20.0
    • 2.20.1
    • 2.3.0
    • 2.4.0
    • 2.4.1
    • 2.5.0
    • 2.6.0
    • 2.7.0
    • 2.8.0
    • 2.9.0
    Affected ranges
    • ECOSYSTEM: < 2.21.0

    Update to 2.21.0

Original sources

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