CVE-2023-25577
High resource usage when parsing multipart form data with many fields
Description
Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Version 2.2.3 contains a patch for this issue.
How to fix CVE-2023-25577
To remediate CVE-2023-25577, upgrade the affected package to a fixed version below.
- —upgrade to 1.0.1+dfsg1-2+deb11u1 or later
- —upgrade to 2.2.3 or later
- —upgrade to 517cac5a804e8c4dc4ed038bb20dacd038e7a9f1 or later
Is CVE-2023-25577 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1.0.1+dfsg1-2+deb11u1
- from 0, < 2.2.3
- from 0, < 517cac5a804e8c4dc4ed038bb20dacd038e7a9f1 | from 0, < 2.2.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |