PT-2019-15867 · Openbsd · Openbsd

Published 2019-12-04 · Updated 2020-08-24 · CVE-2019-19522

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 OpenBSD version 6.6

Description The issue allows local users to gain root access in a specific non-default configuration where S/Key or YubiKey authentication is enabled. This is possible because a user can write to the /etc/skey or /var/db/yubikey file, which does not require ownership by root, by leveraging membership in the auth group.

Recommendations For OpenBSD version 6.6, ensure that the /etc/skey and /var/db/yubikey files are properly secured and owned by root to prevent unauthorized access. Consider disabling S/Key or YubiKey authentication for non-root users or restricting membership in the auth group as a temporary mitigation measure.

Exploit

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2019-19522

Affected Products

Openbsd

References · 9

• 🔥 http://openwall.com/lists/oss-security/2019/12/04/5 · Exploit
• 🔥 https://openwall.com/lists/oss-security/2019/12/04/5 · Exploit
• 🔥 https://seclists.org/bugtraq/2019/Dec/8 · Exploit
• https://osv.dev/vulnerability/CVE-2019-19522 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-19522 · Security Note
• https://openbsd.org/errata66.html · Vendor Advisory
• https://t.me/thehackernews/550 · Telegram Post
• http://seclists.org/fulldisclosure/2019/Dec/14 · Note
• http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html · Note