Vulnerability in Curl
CVE-2023-46218
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.
EPSS: 0.017 (74.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Curl — versions 8.4.0, 7.46.0
- Haxx Curl
- Fedoraproject Fedora — versions 39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support@hackerone.com (Exploit, Patch, Third Party Advisory, Issue Tracking)
- support@hackerone.com (Patch, Vendor Advisory)
- support@hackerone.com (Mailing List, Third Party Advisory)
- support@hackerone.com
- support@hackerone.com
- support@hackerone.com
- support@hackerone.com
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2023-46218?
- CVE-2023-46218 is a medium-severity vulnerability in Curl, classified under Improper Handling of Case Sensitivity. CVSS score: 6.5/10. Published 2023-12-07.
- How severe is CVE-2023-46218?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2023-46218 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.