CVE-2023-46218 Information

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.

Reference

https://hackerone.com/reports/2212193 https://curl.se/docs/CVE-2023-46218.html https://curl.se/docs/CVE-2023-46218.html 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.