Man-in-the-middle attack in Oracle products - CVE-2016-2110

Vulnerability identifier: #VU235

CSH Severity: Medium

CVSS v4.0: 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-2016-2110

CWE-ID: CWE-300

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Samba
Oracle

Affected software:
Samba
Oracle Solaris
Oracle Linux

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to the failure to protect the feature negotiation of NTLMSSP from a downgrade. A remote unauthenticated attacker can bypass security restrictions by using man-in-the-middle techniques to clear NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL flags and perform downgrade attacks.

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

Install Samba 4.4.2, 4.3.8 and 4.2.11.

• http://www-01.ibm.com/support/docview.wss?uid=swg21986595
• https://www.samba.org/samba/security/CVE-2016-2110.html
• http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html