7.7

CVSS Score

3.1

-

CVSS Score

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CVE-2024-45290

CVE-2024-45290: PhpSpreadsheet allows absolute path traversal and Server-Side Request Forgery when opening XLSX file

Summary

It's possible for an attacker to construct an XLSX file which links media from external URLs. When opening the XLSX file, PhpSpreadsheet retrieves the image size and type by reading the file contents, if the provided path is a URL. By using specially crafted php://filter URLs an attacker can leak the contents of any file or URL.

Note that this vulnerability is different from GHSA-w9xv-qf98-ccq4, and resides in a different component.

Details

When an XLSX file is opened, the XLSX reader calls setPath() with the path provided in the xl/drawings/_rels/drawing1.xml.rels file in the XLSX archive:

if (isset($images[$embedImageKey])) {
    // ...omit irrelevant code...
} else {
    $linkImageKey = (string) self::getArrayItem(
        $blip->attributes('http://schemas.openxmlformats.org/officeDocument/2006/relationships'),
        'link'
    );
    if (isset($images[$linkImageKey])) {
        $url = str_replace('xl/drawings/', '', $images[$linkImageKey]);
        $objDrawing->setPath($url);
    }
}

setPath() then reads the file in order to determine the file type and dimensions, if the path is a URL:

public function setPath(string $path, bool $verifyFile = true, ?ZipArchive $zip = null): static
{
    if ($verifyFile && preg_match('~^data:image/[a-z]+;base64,~', $path) !== 1) {
        // Check if a URL has been passed. https://stackoverflow.com/a/2058596/1252979
        if (filter_var($path, FILTER_VALIDATE_URL)) {
            $this->path = $path;
            // Implicit that it is a URL, rather store info than running check above on value in other places.
            $this->isUrl = true;
            $imageContents = file_get_contents($path);
            // ... check dimensions etc. ...

It's important to note here, that filter_var considers also file:// and php:// URLs valid.

The attacker can set the path to anything:

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CVE-2024-45290

CVE-2024-45290:

7.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
phpoffice/phpspreadsheet	composer	>= 2.2.0, < 2.3.0	2.3.0
phpoffice/phpspreadsheet	composer	< 1.29.2	1.29.2
phpoffice/phpspreadsheet

Technical Details

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Root Cause Analysis

The vulnerability stems from the setPath() method's handling of user-supplied paths. The original implementation validated URLs with filter_var() which allows PHP wrappers, then used file_get_contents() on them without proper protocol restrictions. This allowed attackers to craft malicious XLSX files with php://filter URLs to leak file contents via error oracles, and SSRF via HTTP(S) URLs. The commit diff shows critical fixes in this method: protocol whitelisting (http/https/file/ftp/s3), mime-type validation, and error suppression removal - confirming this was the vulnerable entry point.

Vulnerable functions

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WAF Rule

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Reasoning

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7.7

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CVE-2024-45290: PhpSpreadsheet allows absolute path traversal and Server-Side Request Forgery when opening XLSX file

Summary

Details

CVE-2024-45290:

7.7

-

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7.7

7.7

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Root Cause Analysis

Vulnerable functions

CVE-2024-45290: PhpSpreadsheet allows absolute path traversal and Server-Side Request Forgery when opening XLSX file

Summary

Details

Technical Details

PoC

Impact

7.7

-

Basic Information

Basic Information

Concerned about an active attack path?

CVE-2024-45290: PhpSpreadsheet allows absolute path traversal and Server-Side Request Forgery when opening XLSX file

Summary

Details

CVE-2024-45290:

7.7

-

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Basic Information

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Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

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Vulnerable functions

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7.7

7.7

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

CVE-2024-45290: PhpSpreadsheet allows absolute path traversal and Server-Side Request Forgery when opening XLSX file

Summary

Details

Technical Details

PoC

Impact

Vulnerability Intelligence
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