N/A - USN-3158-1

Executive Summary

Summary
Title	Samba vulnerabilities

Informations
Name	USN-3158-1	First vendor Publication	2016-12-19
Vendor	Ubuntu	Last vendor Modification	2016-12-19
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	N/A	Attack Range	N/A
Cvss Impact Score	N/A	Attack Complexity	N/A
Cvss Expoit Score	N/A	Authentication	N/A
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.10 - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Samba.

Software Description: - samba: SMB/CIFS file, print, and login server for Unix

Details:

Frederic Besler and others discovered that the ndr_pull_dnsp_nam function in Samba contained an integer overflow. An authenticated attacker could use this to gain administrative privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-2123)

Simo Sorce discovered that that Samba clients always requested a forwardable ticket when using Kerberos authentication. An attacker could use this to impersonate an authenticated user or service. (CVE-2016-2125)

Volker Lendecke discovered that Kerberos PAC validation implementation in Samba contained multiple vulnerabilities. An authenticated attacker could use this to cause a denial of service or gain administrative privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10. (CVE-2016-2126)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.10:
libsmbclient 2:4.4.5+dfsg-2ubuntu5.2
samba 2:4.4.5+dfsg-2ubuntu5.2
winbind 2:4.4.5+dfsg-2ubuntu5.2

Ubuntu 16.04 LTS:
libsmbclient 2:4.3.11+dfsg-0ubuntu0.16.04.3
samba 2:4.3.11+dfsg-0ubuntu0.16.04.3
winbind 2:4.3.11+dfsg-0ubuntu0.16.04.3

Ubuntu 14.04 LTS:
libsmbclient 2:4.3.11+dfsg-0ubuntu0.14.04.4
samba 2:4.3.11+dfsg-0ubuntu0.14.04.4
winbind 2:4.3.11+dfsg-0ubuntu0.14.04.4

Ubuntu 12.04 LTS:
libsmbclient 2:3.6.25-0ubuntu0.12.04.5
samba 2:3.6.25-0ubuntu0.12.04.5

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-3158-1
CVE-2016-2123, CVE-2016-2125, CVE-2016-2126

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.4.5+dfsg-2ubuntu5.2
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.3
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.4
https://launchpad.net/ubuntu/+source/samba/2:3.6.25-0ubuntu0.12.04.5