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.
History

Thu, 13 Feb 2025 17:30:00 +0000

Type Values Removed Values Added
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. 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.

cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2025-02-13T17:14:19.396Z

Reserved: 2023-10-19T01:00:12.854Z

Link: CVE-2023-46218

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-12-07T01:15:07.160

Modified: 2025-02-13T18:15:33.843

Link: CVE-2023-46218

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-12-06T07:00:00Z

Links: CVE-2023-46218 - Bugzilla