CVE-2024-24752: bref DoS — Exploit & Fix

Description

Bref enable serverless PHP on AWS Lambda. When Bref is used with the Event-Driven Function runtime and the handler is a `RequestHandlerInterface`, then the Lambda event is converted to a PSR7 object. During the conversion process, if the request is a MultiPart, each part is parsed and for each which contains a file, it is extracted and saved in `/tmp` with a random filename starting with `bref_upload_`. The flow mimics what plain PHP does but it does not delete the temporary files when the request has been processed. An attacker could fill the Lambda instance disk by performing multiple MultiPart requests containing files. This vulnerability is patched in 2.1.13.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
mnapoli	bref	< 2.1.13

References

Advisories & Patches

https://github.com/brefphp/bref/commit/350788de12880b6fd64c4c318ba995388bec840e https://github.com/brefphp/bref/security/advisories/GHSA-x4hh-frx8-98r5 https://github.com/brefphp/bref/commit/350788de12880b6fd64c4c318ba995388bec840e https://github.com/brefphp/bref/security/advisories/GHSA-x4hh-frx8-98r5

Exploits

https://github.com/brefphp/bref/security/advisories/GHSA-x4hh-frx8-98r5 https://github.com/brefphp/bref/security/advisories/GHSA-x4hh-frx8-98r5

Frequently Asked Questions

What is CVE-2024-24752? +

Bref enable serverless PHP on AWS Lambda. When Bref is used with the Event-Driven Function runtime and the handler is a `RequestHandlerInterface`, then the Lambda event is converted to a PSR7 object. During the conversion process, if the request is a MultiPart, each part is parsed and for each which contains a file, it is extracted and saved in `/tmp` with a random filename starting with `bref_upload_`. The flow mimics what plain PHP does but it does not delete the temporary files when the request has been processed. An attacker could fill the Lambda instance disk by performing multiple MultiPart requests containing files. This vulnerability is patched in 2.1.13. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2024-24752? +

CVE-2024-24752 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-24752? +

CVE-2024-24752 affects products from mnapoli, specifically: bref. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-24752? +

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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