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CVE-2023-46218

Published: 6 December 2023

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
trusty Not vulnerable
(code not present)
xenial
Released (7.47.0-1ubuntu2.19+esm11)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (7.58.0-2ubuntu3.24+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (8.5.0)
focal
Released (7.68.0-1ubuntu2.21)
jammy
Released (7.81.0-1ubuntu1.15)
lunar
Released (7.88.1-8ubuntu2.4)
mantic
Released (8.2.1-1ubuntu3.2)
Patches:
upstream: https://github.com/curl/curl/commit/2b0994c29a721c91c57

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N