CVE-2018-6557
Published: 21 August 2018
The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.
Notes
Author | Note |
---|---|
mdeslaur | low priority because of default symlink restrictions |
Priority
Status
Package | Release | Status |
---|---|---|
base-files Launchpad, Ubuntu, Debian |
bionic |
Released
(10.1ubuntu2.2)
|
trusty |
Not vulnerable
(code not present)
|
|
upstream |
Needs triage
|
|
xenial |
Not vulnerable
(code not present)
|
|
This vulnerability is mitigated in part by the use of symlink restrictions in Ubuntu. |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.0 |
Attack vector | Local |
Attack complexity | High |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |