Fedora
CVE-2020-14367
MEDIUM
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
A flaw was found in chrony versions before 3.5.1 when creating the PID file under the /var/run/chrony folder. Rated medium severity (CVSS 6.0), this vulnerability is low attack complexity.
Technical ContextAI
This vulnerability is classified under CWE-59. 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. Affected products include: Tuxfamily Chrony, Fedoraproject Fedora, Canonical Ubuntu Linux. Version information: before 3.5.1.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
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External POC / Exploit Code
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