LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session
Published May 12, 2017
4.6
MEDIUMCVSS 3.0
EPSS 0.42%
Description
LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.
Affected products
No data.
- ≤ 1.22.0
Running on/with
- 16.10
- 17.04
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:L/AC:L/Au:N/C:P/I:N/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 v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.42% (0.00418) | 33.81th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.42% (0.00418) | 35.80th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.09% (0.00090) | 38.97th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.09% (0.00090) | 37.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00096) | 38.65th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01040) | 28.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
No CWE recorded.
References (4)
- http://www.securityfocus.com/bid/98554 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://launchpad.net/bugs/1663157 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-8900.html x_refsource_CONFIRMPatchVendor Advisory
- https://www.ubuntu.com/usn/usn-3285-1/ x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/98554 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://launchpad.net/bugs/1663157 | x_refsource_CONFIRMIssue TrackingPatchVendor Advisory | |
| https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-8900.html | x_refsource_CONFIRMPatchVendor Advisory | |
| https://www.ubuntu.com/usn/usn-3285-1/ | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.