GHSA-mmj4-63m4-r6h5critical9.8

CodeIgniter: Uploaded file extension validation bypass in `is_image` and `mime_in` rules

The advisory, in context

Impact

This is an unsafe file upload validation vulnerability that can lead to remote code execution in vulnerable application configurations.

Applications are impacted when they:

validate uploads using is_image or mime_in without an independent safe extension check, such as ext_in on patched versions
save uploaded files using the client-supplied filename
place uploads in a web-accessible directory where PHP files can execute

Patches

Upgrade to v4.7.4 or later.

Workarounds

Save uploads outside the public web root, preferably under writable/uploads.
Use $file->store() or $file->move($path, $file->getRandomName()) instead of preserving the original client filename.
Disable script execution in any public upload directory.
Manually verify the client filename extension before moving the file.
For image uploads, reject files when $file->getClientExtension() is not an allowed image extension.
For exact MIME-type validation, reject files when $file->getClientExtension() does not match $file->guessExtension().

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

codeigniter4/framework Packagist

Ecosystem versions

Earlier releases before 4.7.4

Fixed in 4.7.4

78 explicitly affected versions

4.0.0, 4.0.0-rc.4, v4.0.0-alpha.3, v4.0.0-alpha.4, v4.0.0-alpha.5, v4.0.0-beta.1, v4.0.0-beta.2, v4.0.0-beta.3, v4.0.0-beta.4, v4.0.0-rc.1, v4.0.0-rc.2, v4.0.0-rc.2.1, v4.0.0-rc.3, v4.0.1, v4.0.2, v4.0.3, v4.0.4, v4.0.5, v4.1.0, v4.1.1, v4.1.2, v4.1.3, v4.1.4, v4.1.5, v4.1.6, v4.1.7, v4.1.8, v4.1.9, v4.2.0, v4.2.1, v4.2.10, v4.2.11, v4.2.12, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8, v4.2.9, v4.3.0, v4.3.1, v4.3.2, v4.3.3, v4.3.4, v4.3.5, v4.3.6, v4.3.7, v4.3.8, v4.4.0, v4.4.1, v4.4.2, v4.4.3, v4.4.4, v4.4.5, v4.4.6, v4.4.7, v4.4.8, v4.5.0, v4.5.1, v4.5.2, v4.5.3, v4.5.4, v4.5.5, v4.5.6, v4.5.7, v4.5.8, v4.6.0, v4.6.1, v4.6.2, v4.6.3, v4.6.4, v4.6.5, v4.7.0, v4.7.1, v4.7.2, v4.7.3

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "0"
        },
        {
          "fixed": "4.7.4"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "4.0.0",
    "4.0.0-rc.4",
    "v4.0.0-alpha.3",
    "v4.0.0-alpha.4",
    "v4.0.0-alpha.5",
    "v4.0.0-beta.1",
    "v4.0.0-beta.2",
    "v4.0.0-beta.3",
    "v4.0.0-beta.4",
    "v4.0.0-rc.1",
    "v4.0.0-rc.2",
    "v4.0.0-rc.2.1",
    "v4.0.0-rc.3",
    "v4.0.1",
    "v4.0.2",
    "v4.0.3",
    "v4.0.4",
    "v4.0.5",
    "v4.1.0",
    "v4.1.1",
    "v4.1.2",
    "v4.1.3",
    "v4.1.4",
    "v4.1.5",
    "v4.1.6",
    "v4.1.7",
    "v4.1.8",
    "v4.1.9",
    "v4.2.0",
    "v4.2.1",
    "v4.2.10",
    "v4.2.11",
    "v4.2.12",
    "v4.2.2",
    "v4.2.3",
    "v4.2.4",
    "v4.2.5",
    "v4.2.6",
    "v4.2.7",
    "v4.2.8",
    "v4.2.9",
    "v4.3.0",
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    "v4.3.2",
    "v4.3.3",
    "v4.3.4",
    "v4.3.5",
    "v4.3.6",
    "v4.3.7",
    "v4.3.8",
    "v4.4.0",
    "v4.4.1",
    "v4.4.2",
    "v4.4.3",
    "v4.4.4",
    "v4.4.5",
    "v4.4.6",
    "v4.4.7",
    "v4.4.8",
    "v4.5.0",
    "v4.5.1",
    "v4.5.2",
    "v4.5.3",
    "v4.5.4",
    "v4.5.5",
    "v4.5.6",
    "v4.5.7",
    "v4.5.8",
    "v4.6.0",
    "v4.6.1",
    "v4.6.2",
    "v4.6.3",
    "v4.6.4",
    "v4.6.5",
    "v4.7.0",
    "v4.7.1",
    "v4.7.2",
    "v4.7.3"
  ]
}

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