CVE-2024-24752 Bref Uploaded Files Not Deleted in Event-Driven Functions

2024-02-0116:10:07

CWE-400

GitHub_M

www.cve.org

bref

serverless

php

aws lambda

vulnerability

uploaded files

event-driven functions

psr7

multipart

temporary files

attacker

disk

lambda instance

patch

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

Percentile

13.3%

JSON

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.

CNA Affected

[
  {
    "vendor": "brefphp",
    "product": "bref",
    "versions": [
      {
        "version": "< 2.1.13",
        "status": "affected"
      }
    ]
  }
]