Improper access control in IBM Spectrum Scale Samba

1) Improper access control

EUVDB-ID: #VU58098

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-2124

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to SMB1 client connections can be downgraded to plaintext authentication. A remote attacker can perform a man-in-the-middle attack and downgrade a negotiated SMB1 client connection and its capabitilities.

Mitigation

Install update from vendor's website.

Vulnerable software versions

IBM Spectrum Scale: 5.0.0 - 5.1.2.2

External links

http://www.ibm.com/blogs/psirt/security-bulletin-a-vulnerability-in-samba-affects-ibm-spectrum-scale-smb-protocol-access-method-cve-2016-2124/
http://www.ibm.com/support/pages/node/6565041

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.