Man-in-the-Middle Vulnerability in Samba's Heimdal KDC Implementation
CVE-2018-16860

7.5HIGH

Key Information:

Vendor

Samba

Status
Samba
Vendor
CVE Published:
31 July 2019

What is CVE-2018-16860?

A vulnerability exists in the KDC implementation of Samba's Heimdal versions 4.8.x, 4.9.x, and 4.10.x, allowing an attacker to impersonate a legitimate user. By intercepting requests to the KDC, the attacker can modify the username in the request, enabling them to receive a Kerberos ticket for any user that exists in the KDC. This flaw poses a significant risk in environments utilizing Active Directory Domain Controller mode, as it can lead to unauthorized access and potential data breaches.

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Affected Version(s)

samba 4.8.x up to, excluding 4.8.12

samba 4.9.x up to, excluding 4.9.8

samba 4.10.x up to, excluding 4.10.3

References

https://www.synology.com/security/advisory/Synology_SA_19_23
x_refsource_CONFIRM
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16860
x_refsource_CONFIRM
https://www.samba.org/samba/security/CVE-2018-16860.html
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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