{"id":"GHSA-534c-hcr7-67jg","aliases":[],"title":"Kimai has an XXE Leading to Local File Read","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"### Summary\nKimai 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.\n\n\n### Details\n\nExploitation requires an Administrator account, allowing the upload of an `XLSX` template containing the payload. The vulnerability is triggered by the following code snippet:\n\n```php\n// https://github.com/kimai/kimai/blob/b1903ba18359be16dd32ea9c40377c486498f082/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php#L41\npublic function render(InvoiceDocument $document, InvoiceModel $model): Response\n{\n    $spreadsheet = IOFactory::load($document->getFilename());\n    $worksheet = $spreadsheet->getActiveSheet();\n    $entries = $model->getCalculator()->getEntries();\n    $sheetReplacer = $model->toArray();\n    $invoiceItemCount = \\count($entries);\n    if ($invoiceItemCount > 1) {\n        $this->addTemplateRows($worksheet, $invoiceItemCount);\n    }\n}\n```\n\nThe `IOFactory::load` function utilizes `simplexml_load_string`, which has previously been demonstrated to be vulnerable to XXE attacks.\n\nWhile this is not directly an XXE in Kimai, it does however impact the latest stable version.\n\n \n### PoC\n\nBy uploading a malicious `XLSX` template, the payload will be triggered every time an invoice is generated.\n\n```xml\n<?xml version=\"1.0\" encoding='UTF-7' standalone=\"yes\"?>\n+ADw-!DOCTYPE foo [ <!ENTITY % xxe SYSTEM \"php://filter/.......\" > %xxe;]>.....\n```\n\nFor a better a visibility, I will upload both a:\n- Malicious template sample for testing \n- An exported invoice, showing the contents of target file during the export. \n\n### Impact\nLocal File Read / RCE in edge cases where `phar://` can be utilized with [gadget chains](https://github.com/ambionics/phpggc) . \n\n\n[export.xlsx](https://github.com/user-attachments/files/16803913/export.xlsx)\n[sample_template.xlsx](https://github.com/user-attachments/files/16803916/sample_template.xlsx)\n","severity":"medium","score":6.5,"published":"2024-09-17T18:36:50.000Z","modified":"2024-12-05T05:27:02.542Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"kimai/kimai","sources":[{"name":"OSV · GHSA-534c-hcr7-67jg","url":"https://osv.dev/vulnerability/GHSA-534c-hcr7-67jg"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"2.21.0"}],"type":"ECOSYSTEM"}],"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"],"fixed":["2.21.0"]}],"sourceAffected":[],"references":["https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-ghg6-32f9-2jp7","https://github.com/kimai/kimai/security/advisories/GHSA-534c-hcr7-67jg","https://github.com/kimai/kimai/commit/3204dcb03e1003dba90178667a4667ce3edb87b5","https://github.com/kimai/kimai"],"sources":[{"name":"OSV","id":"GHSA-534c-hcr7-67jg","modified":"2024-12-05T05:27:02.542414Z","url":"https://osv.dev/vulnerability/GHSA-534c-hcr7-67jg"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","score":6.5},{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.5}],"products":[],"remediation":[],"kev":{"status":"unavailable","checkedAt":"2026-10-28T19:20:37.165Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}