CVE-2020-14367

MEDIUM
New! CVE Severity Now Using CVSS v3

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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.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1870298

https://lists.fedoraproject.org/archives/list/[email protected]/message/6WKABKNLCSC3MACCWU6OM2YGWVWFWFMU/

https://security.gentoo.org/glsa/202008-23

https://usn.ubuntu.com/4475-1/

Details

Source: MITRE

Published: 2020-08-24

Updated: 2020-09-09

Type: CWE-59

Risk Information

CVSS v2

Base Score: 3.6

Vector: AV:L/AC:L/Au:N/C:N/I:P/A:P

Impact Score: 4.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 6

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

Impact Score: 5.2

Exploitability Score: 0.8

Severity: MEDIUM

Tenable Plugins

View all (13 total)

IDNameProductFamilySeverity
147595EulerOS Virtualization 3.0.6.6 : chrony (EulerOS-SA-2021-1462)NessusHuawei Local Security Checks
medium
147541EulerOS Virtualization 3.0.2.6 : chrony (EulerOS-SA-2021-1429)NessusHuawei Local Security Checks
medium
147067EulerOS Virtualization for ARM 64 3.0.6.0 : chrony (EulerOS-SA-2021-1581)NessusHuawei Local Security Checks
medium
146179EulerOS 2.0 SP5 : chrony (EulerOS-SA-2021-1182)NessusHuawei Local Security Checks
medium
144806Amazon Linux 2 : chrony (ALAS-2021-1575)NessusAmazon Linux Local Security Checks
medium
144118EulerOS 2.0 SP8 : chrony (EulerOS-SA-2020-2509)NessusHuawei Local Security Checks
medium
143395EulerOS 2.0 SP9 : chrony (EulerOS-SA-2020-2495)NessusHuawei Local Security Checks
medium
143393EulerOS 2.0 SP9 : chrony (EulerOS-SA-2020-2482)NessusHuawei Local Security Checks
medium
140206Amazon Linux AMI : chrony (ALAS-2020-1431)NessusAmazon Linux Local Security Checks
medium
140071GLSA-202008-23 : chrony: Symlink vulnerabilityNessusGentoo Local Security Checks
medium
140029Ubuntu 18.04 LTS / 20.04 : Chrony vulnerability (USN-4475-1)NessusUbuntu Local Security Checks
medium
139763FreeBSD : chrony <= 3.5.1 data corruption through symlink vulnerability writing the pidfile (719f06af-e45e-11ea-95a1-c3b8167b8026)NessusFreeBSD Local Security Checks
medium
139761Fedora 32 : chrony (2020-7aa962c55e)NessusFedora Local Security Checks
medium