systemd up to 239 chown_one race condition

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

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 Tenable (118510) and Exploit-DB (45715). The entries 125996 and 125998 are pretty similar.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

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

NVD Base Score: 4.7
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: 🔍

Local: Yes
Remote: No

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

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

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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0-Day Time: 🔍
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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 🔍
06/03/2023 +1676 days 🔍

Sourcesinfo

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

CVE: CVE-2018-15687 (🔍)
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: 06/03/2023 09:23
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)
Complete: 🔍

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