Vulnerability identifier: #VU23470

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14870

CWE-ID: CWE-358

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect implementation of the DelegationNotAllowed Kerberos feature restriction ("delegation_not_allowed" user attribute) that is not applied when processing protocol transmission requests (S4U2Self) in the AD DC KDC. A remote authenticated user can gain access to sensitive information and functionality within the AD domain.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 4.9.0 - 4.9.16, 4.11.0 - 4.11.2, 4.10.0 - 4.10.10, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16, 4.4.0 - 4.4.16, 4.3.0 - 4.3.13, 4.2.0 - 4.2.14, 4.1.0 - 4.1.23, 4.0.0 - 4.0.26

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External links
http://www.samba.org/samba/security/CVE-2019-14870.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.