Samba: Server memory information leak over SMB1
Published Jul 26, 2018
7.1
HIGHCVSS 3.0
EPSS 7.59%
Description
An information leak flaw was found in the way SMB1 protocol was implemented by Samba before 4.4.16, 4.5.x before 4.5.14, and 4.6.x before 4.6.8. A malicious client could use this flaw to dump server memory contents to a file on the samba share or to a shared printer, though the exact area of server memory cannot be controlled by the attacker.
Affected products
-
- Version 4.4.16StatusaffectedConstraints-
- Version 4.5.14StatusaffectedConstraints-
- Version 4.6.8StatusaffectedConstraints-
- Version 4.7StatusaffectedConstraints-
- Version
Configuration 1
Configuration 2
- 6.0
- 7.0
- 6.0
- 7.0
- 6.0
- 7.0
Configuration 3
- 3.0
Running on/with
- 6.0
- 7.0
Configuration 4
- 8.0
- 9.0
No data.
Red Hat Enterprise Linux 6
samba-0:3.6.23-45.el6_9
Fixed · RHSA-2017:2789
Red Hat Enterprise Linux 6
samba4-0:4.2.10-11.el6_9
Fixed · RHSA-2017:2791
Red Hat Enterprise Linux 7
samba-0:4.6.2-11.el7_4
Fixed · RHSA-2017:2790
Red Hat Gluster Storage 3.3 for RHEL 6
samba-0:4.6.3-6.el6rhs
Fixed · RHSA-2017:2858
Red Hat Gluster Storage 3.3 for RHEL 7
samba-0:4.6.3-6.el7rhgs
Fixed · RHSA-2017:2858
Red Hat Enterprise Linux 5
samba
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | samba-0:3.6.23-45.el6_9 | Fixed | RHSA-2017:2789 |
| Red Hat Enterprise Linux 6 | samba4-0:4.2.10-11.el6_9 | Fixed | RHSA-2017:2791 |
| Red Hat Enterprise Linux 7 | samba-0:4.6.2-11.el7_4 | Fixed | RHSA-2017:2790 |
| Red Hat Gluster Storage 3.3 for RHEL 6 | samba-0:4.6.3-6.el6rhs | Fixed | RHSA-2017:2858 |
| Red Hat Gluster Storage 3.3 for RHEL 7 | samba-0:4.6.3-6.el7rhgs | Fixed | RHSA-2017:2858 |
| Red Hat Enterprise Linux 5 | samba | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
As this is an SMB1-only vulnerability, it can be avoided by setting the server to only use SMB2 via adding: server min protocol = SMB2_02 to the [global] section of your smb.conf and restarting smbd.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
AV:A/AC:L/Au:N/C:P/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 v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 7.59% (0.07590) | 94.36th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.59% (0.07590) | 93.74th | v5 (v2026.06.15) |
| Mar 13, 2026 | 41.38% (0.41375) | 97.34th | v4 (v2025.03.14) |
| Mar 10, 2026 | 39.61% (0.39614) | 97.24th | v4 (v2025.03.14) |
| Feb 9, 2026 | 57.92% (0.57920) | 98.12th | v4 (v2025.03.14) |
| Nov 30, 2025 | 58.95% (0.58954) | 98.12th | v4 (v2025.03.14) |
| Oct 19, 2025 | 46.47% (0.46471) | 97.50th | v4 (v2025.03.14) |
| Jul 12, 2025 | 27.33% (0.27333) | 96.17th | v4 (v2025.03.14) |
| Mar 30, 2025 | 19.81% (0.19806) | 94.97th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.04% (0.03045) | 77.73th | v4 (v2025.03.14) |
| Mar 20, 2025 | 19.81% (0.19806) | 95.00th | v4 (v2025.03.14) |
| Mar 17, 2025 | 21.07% (0.21074) | 95.17th | v4 (v2025.03.14) |
| Dec 17, 2024 | 41.09% (0.41095) | 97.34th | v3 (v2023.03.01) |
| Oct 29, 2024 | 53.57% (0.53567) | 97.69th | v3 (v2023.03.01) |
| Jul 5, 2024 | 62.95% (0.62946) | 97.87th | v3 (v2023.03.01) |
| May 10, 2024 | 66.42% (0.66423) | 97.91th | v3 (v2023.03.01) |
| Jan 26, 2024 | 65.09% (0.65093) | 97.61th | v3 (v2023.03.01) |
| Dec 17, 2023 | 68.08% (0.68078) | 97.66th | v3 (v2023.03.01) |
| Jul 20, 2023 | 71.34% (0.71336) | 97.62th | v3 (v2023.03.01) |
| Jun 1, 2023 | 72.11% (0.72109) | 97.59th | v3 (v2023.03.01) |
| May 8, 2023 | 70.02% (0.70017) | 97.49th | v3 (v2023.03.01) |
| Apr 26, 2023 | 31.39% (0.31388) | 96.33th | v3 (v2023.03.01) |
| Mar 11, 2023 | 31.84% (0.31839) | 96.28th | v3 (v2023.03.01) |
| Mar 7, 2023 | 30.80% (0.30805) | 96.23th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.88% (0.02880) | 63.65th | v1 |
| Jan 6, 2022 | 2.88% (0.02880) | 63.31th | v1 |
| Sep 1, 2021 | 2.88% (0.02880) | 80.71th | v1 |
| Apr 14, 2021 | 2.88% (0.02880) | 0.00th | v1 |
References (17)
- http://www.securityfocus.com/bid/100925 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039401 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2789 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2790 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2791 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2858 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-12163 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1491206 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12163 x_refsource_CONFIRMIssue TrackingMitigationThird Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbns03775en_us x_refsource_CONFIRMThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-12163
- https://security.netapp.com/advisory/ntap-20170921-0001/ x_refsource_CONFIRMThird Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03817en_us x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-12163
- https://www.debian.org/security/2017/dsa-3983 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.samba.org/samba/security/CVE-2017-12163.html x_refsource_CONFIRMPatchVendor Advisory
- https://www.synology.com/support/security/Synology_SA_17_57_Samba x_refsource_CONFIRMMitigationThird Party Advisory
Change history (0)
No recorded changes yet.