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CVE-2017-18018

Publication date 4 January 2018

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

4.7 · Medium

Score breakdown

In GNU Coreutils through 8.29, chown-core.c in chown and chgrp does not prevent replacement of a plain file with a symlink during use of the POSIX "-R -L" options, which allows local users to modify the ownership of arbitrary files by leveraging a race condition.

Read the notes from the security team

Status

Package Ubuntu Release Status
coreutils 22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal
Not affected
19.10 eoan Ignored end of life
19.04 disco Ignored end of life
18.10 cosmic Ignored end of life
18.04 LTS bionic Ignored documentation patch only
17.10 artful Ignored end of life
17.04 zesty Ignored end of life
16.04 LTS xenial Ignored documentation patch only
14.04 LTS trusty Ignored documentation patch only

Notes

ccdm94

It seems like this will not be fixed upstream (due to the nature of the chown and chgrp utilities), the available patch being a documentation change to warn users about insecure software behavior when certain options are used together in chown and chgrp. For this reason, we will not be fixing this issue in releases where it would be needed. These will be marked as ignored.

Severity score breakdown

Parameter Value
Base score 4.7 · Medium
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N