Security Bulletin: Samba vulnerability issue on IBM SONAS (CVE-2016-2125, CVE-2016-2126 )

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-2016-2125**
DESCRIPTION:** Samba could allow a remote authenticated attacker to gain elevated privileges on the system, caused by forwarding a Ticket Granting Ticket (TGT) to other service when using Kerberos authentication. An attacker could exploit this vulnerability to impersonate the authenticated user and gain elevated privileges on the system.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119968 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

CVEID: CVE-2016-2126**
DESCRIPTION:** Samba could allow a remote authenticated attacker to gain elevated privileges on the system, caused by the failure of handling the PAC checksum. By using a specially-crafted Kerberos ticket, an authenticated attacker could exploit this vulnerability to gain privileges or cause the winbindd process to crash.
CVSS Base Score: 6.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/119906 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)

Affected Products and Versions

IBM SONAS
The product is affected when running a code releases 1.5.0.0 to 1.5.2.5

Remediation/Fixes

A fix for these issues is in version 1.5.2.6 of IBM SONAS. Customers running an affected version of SONAS should upgrade to 1.5.2.6 or a later version, so that the fix gets applied.

Please contact IBM support for assistance in upgrading your system.

Workarounds and Mitigations

None