CVE-2024-4030

HIGH
Published May 7, 2024 Modified Apr 15, 2026 CWE-276

Description

On Windows a directory returned by tempfile.mkdtemp() would not always have permissions set to restrict reading and writing to the temporary directory by other users, instead usually inheriting the correct permissions from the default location. Alternate configurations or users without a profile directory may not have the intended permissions. If you’re not using Windows or haven’t changed the temporary directory location then you aren’t affected by this vulnerability. On other platforms the returned directory is consistently readable and writable only by the current user. This issue was caused by Python not supporting Unix permissions on Windows. The fix adds support for Unix “700” for the mkdir function on Windows which is used by mkdtemp() to ensure the newly created directory has the proper permissions.

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CVSS v3.1 Score

7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-276 Incorrect Default Permissions

References

Other References

https://github.com/python/cpython/commit/35c799d79177b962ddace2fa068101465570a29a https://github.com/python/cpython/commit/5130731c9e779b97d00a24f54cdce73ce9975dfd https://github.com/python/cpython/commit/66f8bb76a15e64a1bb7688b177ed29e26230fdee https://github.com/python/cpython/commit/6d0850c4c8188035643586ab4d8ec2468abd699e https://github.com/python/cpython/commit/81939dad77001556c527485d31a2d0f4a759033e https://github.com/python/cpython/commit/8ed546679524140d8282175411fd141fe7df070d https://github.com/python/cpython/commit/91e3669e01245185569d09e9e6e11641282971ee https://github.com/python/cpython/commit/94591dca510c796c7d40e9b4167ea56f2fdf28ca https://github.com/python/cpython/commit/c8f868dc52f98011d0f9b459b6487920bfb0ac4d https://github.com/python/cpython/commit/d86b49411753bf2c83291e3a14ae43fefded2f84

Frequently Asked Questions

What is CVE-2024-4030? +
On Windows a directory returned by tempfile.mkdtemp() would not always have permissions set to restrict reading and writing to the temporary directory by other users, instead usually inheriting the correct permissions from the default location. Alternate configurations or users without a profile directory may not have the intended permissions. If you’re not using Windows or haven’t changed the temporary directory location then you aren’t affected by this vulnerability. On other platforms the returned directory is consistently readable and writable only by the current user. This issue was caused by Python not supporting Unix permissions on Windows. The fix adds support for Unix “700” for the mkdir function on Windows which is used by mkdtemp() to ensure the newly created directory has the proper permissions. It has a CVSS v3.1 base score of 7.1 (HIGH).
How severe is CVE-2024-4030? +
CVE-2024-4030 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
How do I check if I'm vulnerable to CVE-2024-4030? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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