Security Bulletin: Samba vulnerability issue in IBM SONAS (CVE-2016-2119)

Security Bulletin

Summary

IBM SONAS is shipped with Samba, for which a fix is available for security vulnerabilities.

Vulnerability Details

Samba is used in IBM SONAS to enable file management and authentication services for Microsoft Windows environments.

CVEID: CVE-2016-2119
DESCRIPTION: Samba could allow a remote attacker to conduct spoofing attacks. A man-in-the-middle attacker could exploit this vulnerability to inject the SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL flags to downgrade the client's configuration-required signing protections for SMB2 or SMB3 client connections and spoof the server.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/114797 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

Affected Products and Versions

IBM SONAS
The product is affected when running a code releases 1.5.0.0 to 1.5.2.4

Remediation/Fixes

A fix for this issue is in version 1.5.2.5 of IBM SONAS. Customers running an affected version of SONAS should upgrade to 1.5.2.5 or a later version, so that the fix gets applied.

Please contact IBM support for assistance in upgrading your system.

Workarounds and Mitigations

Workaround :
Setting "client ipc max protocol = NT1".

If "client signing" is set to "mandatory"/"required",
remove an explicit setting of "client max protocol", which will default
to "NT1".

These changes should be reverted once the security fixes are applied.

Mitigation: No

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

31 Oct 2016: First draft

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Tips

Security Bulletin: Samba vulnerability issue in IBM SONAS (CVE-2016-2119)