#VU237 Man-in-the-middle attack in Samba - CVE-2016-2112

Vulnerability identifier: #VU237

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-2112

CWE-ID: CWE-300

Exploitation vector: Network

Exploit availability: No

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

Vendor: Samba

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

The vulnerability exists due to the failure to enforce integrity protection by the LDAP client and server. A remote unauthenticated attacker can bypass security restrictions by using man-in-the-middle techniques to downgrade LDAP connections.

Successful exploitation of this vulnerability may result in security restrictions bypass.

Mitigation
Install Samba 4.4.2, 4.3.8 and 4.2.11.

Vulnerable software versions

Samba: 3.0.0, 3.2.0, 3.6.0, 4.0.0

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External links
https://www-01.ibm.com/support/docview.wss?uid=swg21986595
https://www.samba.org/samba/security/CVE-2016-2112.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 Internet.

Is there known malware, which exploits this vulnerability?

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