CVE-2018-15687 : A race condition in chown_one() of systemd allows an attacker to cause systemd t

A race condition in chown_one() of systemd allows an attacker to cause systemd to set arbitrary permissions on arbitrary files. Affected releases are systemd versions up to and including 239.

Published 2018-10-26 14:29:01

Updated 2023-04-20 18:38:05

Source Canonical Ltd.

View at NVD, CVE.org

Products affected by CVE-2018-15687

Canonical » Ubuntu Linux » Version: 16.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 18.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 18.10
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
Matching versions
Systemd Project » Systemd
Versions from including (>=) 235 and before (<) 240
cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2018-15687

EPSS FAQ

0.35%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 55 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2018-15687

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.9	MEDIUM	AV:L/AC:M/Au:N/C:C/I:C/A:C	3.4	10.0	NIST
Access Vector: Local Access Complexity: Medium Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
7.8	HIGH	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	1.8	5.9	Canonical Ltd.
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
7.0	HIGH	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	1.0	5.9	NIST
Attack Vector: Local Attack Complexity: High Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2018-15687

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-15687

https://usn.ubuntu.com/3816-1/

USN-3816-1: systemd vulnerabilities | Ubuntu security notices
Third Party Advisory

CVEs referencing this url
https://www.exploit-db.com/exploits/45715/

systemd - 'chown_one()' Dereference Symlinks
Exploit;Third Party Advisory;VDB Entry
http://www.securityfocus.com/bid/105748

systemd CVE-2018-15687 Local Security Bypass Vulnerability
Broken Link;Third Party Advisory;VDB Entry
https://github.com/systemd/systemd/pull/10517/commits

recursive chowning fixes by poettering · Pull Request #10517 · systemd/systemd · GitHub
Patch;Third Party Advisory
https://security.gentoo.org/glsa/201810-10

systemd: Multiple vulnerabilities (GLSA 201810-10) — Gentoo security
Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2018-15687

Products affected by CVE-2018-15687

Exploit prediction scoring system (EPSS) score for CVE-2018-15687

CVSS scores for CVE-2018-15687

CWE ids for CVE-2018-15687

References for CVE-2018-15687