CVE-2019-14870

描述

All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.

如何修補 CVE-2019-14870

要修補 CVE-2019-14870,請將受影響套件升級到下列已修補版本。

• —升級至 7.7.1-r0 或更新版本
• —升級至 4.10.11-r0 或更新版本

CVE-2019-14870 正在被利用嗎?

低 — EPSS 為 2.8%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• from 0, < 7.7.1-r0
• >= 4.0.0, < 4.10.11-r0

CVSS 分數

參考連結(1)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-14870