What’s Vulnerable › Vulnerabilities

CVE-2018-16860

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-31 · updated 2026-06-17
• Weakness: CWE-358

Description

A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.

Affected products

• Heimdal Software Kerberos: from 0.8 through 7.5.0
• Samba: from 4.8.0 before 4.8.12; from 4.9.0 before 4.9.8; from 4.10.0 before 4.10.3 — fixed in 4.10.3, 4.8.12, 4.9.8

How to fix

Upgrade to a fixed version: Samba 4.10.3, 4.8.12, 4.9.8. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00026.html
• http://seclists.org/fulldisclosure/2019/Aug/11
• http://seclists.org/fulldisclosure/2019/Aug/13
• http://seclists.org/fulldisclosure/2019/Aug/14
• http://seclists.org/fulldisclosure/2019/Aug/15
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16860
• https://seclists.org/bugtraq/2019/Aug/21
• https://seclists.org/bugtraq/2019/Aug/22
• https://seclists.org/bugtraq/2019/Aug/23
• https://seclists.org/bugtraq/2019/Aug/25
• https://security.gentoo.org/glsa/202003-52
• https://support.apple.com/HT210346

Get alerted when CVE-2018-16860 or the next vulnerability affects your stack