Security restrictions bypass in Oracle products - CVE-2016-2119

Vulnerability identifier: #VU101

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2016-2119

CWE-ID: CWE-264

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 downgrade client signing security controls on the target system.

The vulnerability exists due to state error in Samba. A remote unauthenticated attacker can downgrade the required signing for an SMB2/3 client connection by injecting the SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags.

Successful exploitation of this vulnerability may result in disclosure of system information.

The vendor has issued a fix (4.2.14, 4.3.11, 4.4.5).

• https://www.samba.org/samba/security/CVE-2016-2119.html
• http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html