Resource exhaustion in Brefphp Bref
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Brefphp Bref — versions < 2.1.13
- Mnapoli Bref
Weakness classification (CWE)
References
- github.com/brefphp/bref/security/advisories/GHSA-x4hh-frx8-98r5 (Exploit, Vendor Advisory)
- github.com/brefphp/bref/commit/350788de12880b6fd64c4c318ba995388bec840e (Patch)
Frequently asked questions
- What is CVE-2024-24752?
- CVE-2024-24752 is a medium-severity vulnerability in Brefphp Bref, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2024-02-01.
- How severe is CVE-2024-24752?
- Medium severity. CVSS v3 base score is 6.5 out of 10.