PT-2018-2894 · Systemd+3 · Systemd+3

Padma81 · Published 2018-01-24 · Updated 2024-06-15 · CVE-2018-6954

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions systemd versions prior to 237

Description The issue is related to the mishandling of symlinks by systemd-tmpfiles in systemd, allowing local users to obtain ownership of arbitrary files. This occurs through the creation of a directory and a file under that directory, and later replacing that directory with a symlink. The issue persists even when the fs.protected symlinks sysctl is enabled.

Recommendations For versions prior to 237, update to a version that includes the fix for this issue to prevent exploitation. As a temporary workaround, consider restricting the use of systemd-tmpfiles to minimize the risk of exploitation.

Exploit

Fix

Link Following

Weakness Enumeration

CWE-264

CWE-59

Related Identifiers

ALT-PU-2018-1413

BDU:2019-02469

CVE-2018-6954

OPENSUSE-SU-2019:0098-1

OPENSUSE-SU-2019_0098-1

OPENSUSE-SU-2019_1450-1

OPENSUSE-SU-2024:11420-1

SUSE-SU-2019:0137-1

SUSE-SU-2019:1265-1

SUSE-SU-2019_1265-1

USN-3816-1

USN-3816-2

USN-3816-3

Affected Products

Alt Linux

Suse

Ubuntu

Systemd

References · 72

• 🔥 https://github.com/systemd/systemd/issues/7986 · Exploit
• https://usn.ubuntu.com/3816-2 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-6954 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3816-2 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:0098-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-6954 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-6954 · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-6954 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2018-6954 · Security Note
• https://bdu.fstec.ru/vul/2019-02469 · Security Note
• https://ubuntu.com/security/notices/USN-3816-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-15687 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-6954 · Security Note
• https://ubuntu.com/security/CVE-2018-15686 · Vendor Advisory