CVE-2023-46218
Published: December 7, 2023Last modified: September 22, 2025
Description
This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than what is otherwise allowed or possible. This allows a site to set cookies that then would get sent to different and unrelated sites and domains. It could do this by exploiting a mixed case flaw in curl's function that verifies a given cookie domain against the Public Suffix List (PSL). For example a cookie could be set with `domain=co.UK` when the URL used a lower case hostname `curl.co.uk`, even though `co.uk` is listed as a PSL domain.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | LOW |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | curl | Fixed (8.5.0-r0) |
| Stream | curl | Fixed (8.5.0-r0) |
References
- https://curl.se/docs/CVE-2023-46218.html
- https://hackerone.com/reports/2212193
- https://lists.debian.org/debian-lts-announce/2023/12/msg00015.html
- https://lists.fedoraproject.org/archives/list/[email protected]/message/3ZX3VW67N4ACRAPMV2QS2LVYGD7H2MVE/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/UOGXU25FMMT2X6UUITQ7EZZYMJ42YWWD/
- https://security.netapp.com/advisory/ntap-20240125-0007/
- https://www.debian.org/security/2023/dsa-5587