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Fencer Intel
high 7.5

CVE-2017-18190 json

A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbit…

published 8y ago modified 4mo ago also EUVD-2017-9325

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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).

Patch / fix

  • apple cups 2.2.2
  • cups Debian 14, Debian 13, Debian 12 2.2.3-2

debian advisories DEBIAN-CVE-2017-18190

  • cups Ubuntu 14.04 LTS 1.7.2-0ubuntu1.9
  • cups Ubuntu 16.04 LTS 2.1.3-4ubuntu0.4

ubuntu advisories UBUNTU-CVE-2017-18190

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cups RHEL 7 1:1.6.3-51.el7
  • cups-lpd RHEL 7 1:1.6.3-51.el7
  • cups-libs RHEL 7 1:1.6.3-51.el7
  • cups-client RHEL 7 1:1.6.3-51.el7
  • cups-ipptool RHEL 7 1:1.6.3-51.el7
  • cups-filesystem RHEL 7 1:1.6.3-51.el7

red hat advisories RHSA-2020:3864

  • cups SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 1.7.5-20.3.1

suse advisories SUSE-SU-2018:0604-1

  • cups Alpine 3.5 2.2.2-r0

alpine advisories ALPINE-CVE-2017-18190

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2017-18190 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-18190 updated cvss 5.8

cups: DNS rebinding attacks via incorrect whitelist

  • Red Hat Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs
    affected: workaround, no fix planned “Ensure that "localhost.localdomain" resolves to 127.0.0.1, for example by adding it to /etc/hosts. This is the default on Red Hat Enterprise Linux 7.”
  • Red Hat Enterprise Linux Client (v. 7) cups 1.6.3-51.el7, cups-lpd 1.6.3-51.el7, cups-libs 1.6.3-51.el7, cups-client 1.6.3-51.el7, cups-filesystem 1.6.3-51.el7 Red Hat Enterprise Linux Client Optional (v. 7) cups-ipptool 1.6.3-51.el7 Red Hat Enterprise Linux ComputeNode (v. 7) cups 1.6.3-51.el7, cups-lpd 1.6.3-51.el7, cups-libs 1.6.3-51.el7, cups-client 1.6.3-51.el7, cups-filesystem 1.6.3-51.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) cups-ipptool 1.6.3-51.el7 Red Hat Enterprise Linux Server (v. 7) cups 1.6.3-51.el7, cups-lpd 1.6.3-51.el7, cups-libs 1.6.3-51.el7, cups-client 1.6.3-51.el7, cups-filesystem 1.6.3-51.el7 Red Hat Enterprise Linux Server Optional (v. 7) cups-ipptool 1.6.3-51.el7
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) cups 1.6.3-51.el7, cups-lpd 1.6.3-51.el7, cups-libs 1.6.3-51.el7, cups-client 1.6.3-51.el7, cups-filesystem 1.6.3-51.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) cups-ipptool 1.6.3-51.el7
    fixed: vendor fix “Ensure that "localhost.localdomain" resolves to 127.0.0.1, for example by adding it to /etc/hosts. This is the default on Red Hat Enterprise Linux 7.” RHSA-2020:3864
  • Red Hat Enterprise Linux 5 cups Red Hat Enterprise Linux 8 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.92% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/project-zero/issues/detail?id=1048 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.