K000138650 : cURL vulnerability CVE-2023-46218

Security Advisory 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. (CVE-2023-46218)

Impact

The affected F5 products are not using the cURL library or binary in a vulnerable way. However, F5 products can be vulnerable when custom scripts are used to accept super cookies and exposed to this vulnerability.