A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).
https://bugs.chromium.org/p/project-zero/issues/detail?id=1048
https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41
https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html
Source: MITRE
Published: 2018-02-16
Updated: 2019-10-03
Type: CWE-290
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH