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Security Bulletin: Multiple vulnerabilities in Samba, including Badlock, affect IBM i

Security Bulletin


Summary

Samba vulnerabilities were disclosed on April 12, 2016. Samba is used by IBM i. IBM i has addressed the applicable CVEs.

Vulnerability Details

CVEID: CVE-2016-2118
DESCRIPTION: Samba could allow a remote attacker to gain elevated privileges on the system, caused by the acceptance of inadequate authentication levels by the Microsoft Security Account Manager (SAM) and Local Security Authority (Domain Policy) (LSAD) remote protocols. An attacker could exploit this vulnerability using man-in-the-middle techniques to impersonate an authenticated user against the SAMR or LSAD service and gain access to the Security Account Manager (SAM) database. This vulnerability is also known as the BADLOCK bug.
CVSS Base Score: 7.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111935 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVEID: CVE-2015-5370
DESCRIPTION: Samba is vulnerable to a denial of service, caused by the improper validation of DCE-RPC packets by the DCE-RPC client and server implementations. An attacker could exploit this vulnerability using man-in-the-middle techniques to downgrade a secure connection to an insecure one and consume an overly large amount of CPU resources.
CVSS Base Score: 5.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111936 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L)

CVEID: CVE-2016-2110
DESCRIPTION: Samba could allow a remote attacker to bypass security restrictions, caused by the failure to protect the feature negotiation of NTLMSSP from a downgrade. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to clear NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL flags and perform downgrade attacks.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111937 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2111
DESCRIPTION: Samba could allow a remote attacker to conduct spoofing attacks, caused by an error in the NETLOGON service when a Domain Controller is configured. By logging into a domain joined system and observing network traffic, an attacker could exploit this vulnerability using a specially crafted application to connect to another domain joined system and access session-related information of the spoofed computer.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111938 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2112
DESCRIPTION: Samba could allow a remote attacker to bypass security restrictions, caused by the failure to enforce integrity protection by the LDAP client and server. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to downgrade LDAP connections.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111939 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2113
DESCRIPTION: Samba could allow a remote attacker to bypass security restrictions, caused by the failure to validate TLS certificates. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to perform unauthorized actions.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111940 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2114
DESCRIPTION: Samba could allow a remote attacker to bypass security restrictions, caused by the failure to enforce required smb signing. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to perform unauthorized actions.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111941 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2115
DESCRIPTION: Samba could allow a remote attacker to bypass security restrictions, caused by the failure to protect the integrity of SMB client connections for IPC traffic. A remote attacker could exploit this vulnerability using man-in-the-middle techniques to perform unauthorized actions.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/111942 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)

Affected Products and Versions

Releases 7.2 and 7.3 of IBM i are affected.

Remediation/Fixes

The issue can be fixed by applying a PTF to the IBM i Operating System.

Releases 7.2 and 7.3 of IBM i are supported and will be fixed.

http://www-933.ibm.com/support/fixcentral/
The IBM i PTF numbers are:

Release 7.2 – SI60443
Release 7.3 – SI60444

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None known

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References

Related information

*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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.


Cross reference information
Segment Product Component Platform Version Edition
Operating System IBM i 7.3
Operating System IBM i 7.2

Document information

More support for: IBM i
Security

Software version: 7.2, 7.3

Operating system(s): IBM i

Reference #: N1021296

Modified date: 26 April 2016