cups: DNS rebinding attacks via incorrect whitelist
Published Feb 16, 2018
7.5
HIGHCVSS 3.0
EPSS 2.92%
Description
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).
Affected products
No data.
Configuration 2
- 7.0
- 8.0
Configuration 3
- 14.04
- 16.04
No data.
Red Hat Enterprise Linux 7
cups-1:1.6.3-51.el7
Fixed · RHSA-2020:3864
Red Hat Enterprise Linux 5
cups
Not affected
Red Hat Enterprise Linux 6
cups
Out of support scope
Red Hat Enterprise Linux 8
cups
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | cups-1:1.6.3-51.el7 | Fixed | RHSA-2020:3864 |
| Red Hat Enterprise Linux 5 | cups | Not affected | n/a |
| Red Hat Enterprise Linux 6 | cups | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | cups | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
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.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.92% (0.02923) | 86.57th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.03% (0.03026) | 85.70th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.32% (0.00317) | 70.71th | v3 (v2023.03.01) |
| Jul 3, 2024 | 0.32% (0.00317) | 70.61th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.33% (0.00330) | 70.25th | v3 (v2023.03.01) |
| Jul 10, 2023 | 0.33% (0.00330) | 67.05th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00275) | 63.01th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.25% (0.00246) | 1.78th | v1 |
| Jan 6, 2022 | 0.25% (0.00246) | 1.75th | v1 |
| Sep 1, 2021 | 0.25% (0.00246) | 4.50th | v1 |
| Apr 14, 2021 | 0.25% (0.00246) | 0.00th | v1 |
References (9)
- https://access.redhat.com/security/cve/CVE-2017-18190 Vendor Advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1048 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1546395 Issue Tracking
- https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41 x_refsource_MISCPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-18190
- https://usn.ubuntu.com/3577-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-18190
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2017-18190 | Vendor Advisory | |
| https://bugs.chromium.org/p/project-zero/issues/detail?id=1048 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1546395 | Issue Tracking | |
| https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41 | x_refsource_MISCPatchThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2018/02/msg00023.html | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2018/07/msg00003.html | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-18190 | ||
| https://usn.ubuntu.com/3577-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2017-18190 |
Change history (0)
No recorded changes yet.