systemd up to 239 chown_one race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in systemd up to 239. This vulnerability affects the function chown_one. Performing a manipulation results in race condition. This vulnerability is reported as CVE-2018-15687. The attack requires a local approach. Moreover, an exploit is present. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in systemd up to 239. It has been classified as critical. This affects the function chown_one. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence 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 that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 10/26/2018. The weakness was disclosed 10/26/2018 by Jann Horn with Google Project Zero (Website). The advisory is shared at securityfocus.com. This vulnerability is uniquely identified as CVE-2018-15687 since 08/22/2018. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 118510 (GLSA-201810-10 : systemd: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277521 (Fedora Security Update for systemd.git438ac26 (FEDORA-2018-24bd6c9d4a)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (45715), Tenable (118510) and SecurityFocus (BID 105748†). The entries VDB-125996 and VDB-125998 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 4.5
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector (Canonical Ltd.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118510
Nessus Name: GLSA-201810-10 : systemd: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: github.com

Timelineinfo

08/22/2018 🔍
10/26/2018 +65 days 🔍
10/26/2018 +0 days 🔍
10/26/2018 +0 days 🔍
10/26/2018 +0 days 🔍
10/27/2018 +1 days 🔍
10/30/2018 +3 days 🔍
10/31/2018 +1 days 🔍
06/09/2025 +2413 days 🔍

Sourcesinfo

Product: github.com

Advisory: USN-3816-1⛔
Researcher: Jann Horn
Organization: Google Project Zero
Status: Confirmed

CVE: CVE-2018-15687 (🔍)
GCVE (CVE): GCVE-0-2018-15687
GCVE (VulDB): GCVE-100-125997
SecurityFocus: 105748 - systemd CVE-2018-15687 Local Security Bypass Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 10/27/2018 18:25
Updated: 06/09/2025 19:58
Changes: 10/27/2018 18:25 (72), 04/06/2020 20:24 (10), 06/03/2023 09:20 (5), 06/03/2023 09:23 (12), 12/14/2024 09:36 (15), 06/09/2025 19:58 (10)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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