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CVE-2020-14367

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202008-23
Posted Aug 31, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202008-23 - A vulnerability in chrony may allow a privileged attacker to cause data loss via a symlink. Versions less than 3.5.1 are affected.

tags | advisory
systems | linux, gentoo
advisories | CVE-2020-14367
MD5 | 85608a4e53759653503e8087cd495b08
Ubuntu Security Notice USN-4475-1
Posted Aug 27, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4475-1 - It was discovered that Chrony incorrectly handled certain symbolic links. An attacker could possibly use this issue to cause a denial of service or expose sensitive information.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2020-14367
MD5 | 14921cf609df424352817f166e5b905c
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