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
 
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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

Original Source

Url : http://www.ubuntu.com/usn/USN-3158-1

Alert History

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0
1
Date Informations
2016-12-21 13:22:26
  • Multiple Updates
2016-12-20 00:23:50
  • First insertion