libcurl wrongly allows cookies to be set for Top Level Domains (TLDs) if thehost name is provided with a trailing dot.curl can be told to receive and send cookies. curl's "cookie engine" can bebuilt with or without Public Suffix Listawareness. If PSL support not provided, a more rudimentary check exists to atleast prevent cookies from being set on TLDs. This check was broken if thehost name in the URL uses a trailing dot.This can allow arbitrary sites to set cookies that then would get sent to adifferent and unrelated site or domain.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-27779
• https://hackerone.com/reports/1553301
• https://security.gentoo.org/glsa/202212-01
• https://security.netapp.com/advisory/ntap-20220609-0009