Description
A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file is created during chronyd startup while still running as the root user, and when it's opened for writing, chronyd does not check for an existing symbolic link with the same file name. This flaw allows an attacker with privileged access to create a symlink with the default PID file name pointing to any destination file in the system, resulting in data loss and a denial of service due to the path traversal.
Published: 2020-08-24
Score: 6.0 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2020-6508 A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. The file is created during chronyd startup while still running as the root user, and when it's opened for writing, chronyd does not check for an existing symbolic link with the same file name. This flaw allows an attacker with privileged access to create a symlink with the default PID file name pointing to any destination file in the system, resulting in data loss and a denial of service due to the path traversal.
Ubuntu USN Ubuntu USN USN-4475-1 Chrony vulnerability
History

Sun, 13 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.0033}

epss

{'score': 0.00284}


Subscriptions

Canonical Ubuntu Linux
Fedoraproject Fedora
Tuxfamily Chrony
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-04T12:46:33.289Z

Reserved: 2020-06-17T00:00:00.000Z

Link: CVE-2020-14367

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2020-08-24T15:15:13.147

Modified: 2024-11-21T05:03:06.350

Link: CVE-2020-14367

cve-icon Redhat

Severity : Moderate

Publid Date: 2020-08-19T17:10:00Z

Links: CVE-2020-14367 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses