Vulnerability identifier: #VU8517

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12151

CWE-ID: CWE-310

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 perform a MitM attack.

The vulnerability exists due to absence of encryption across DFS redirects. A remote attacker can read and alter documents, transferred via a client connection.

Mitigation
Update to version 4.6.8, 4.5.14 and 4.4.16or apply patches:
https://www.samba.org/samba/ftp/patches/security/samba-4.4.15-security-2017-09-20.patch
https://www.samba.org/samba/ftp/patches/security/samba-4.5.13-security-2017-09-20.patch
https://www.samba.org/samba/ftp/patches/security/samba-4.6.7-security-2017-09-20.patch

Vulnerable software versions

Samba: 4.1.0 - 4.1.23, 4.2.0 - 4.2.14, 4.3.0 - 4.3.13, 4.4.0 - 4.4.15, 4.5.0 - 4.5.13, 4.6.0 - 4.6.7

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External links
http://www.samba.org/samba/security/CVE-2017-12151.html

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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