Samba Server Security Update 4.5.3 4.4.8 und 4.3.13

Kurz nachdem am 7.12.2016 die Version 4.5.2, des beliebten Open-Source Fileserver unter Linux, freigegeben wurde, gibt es nun ein Sicherheitsupdate für alle stable Zweige.

Dieses Update behebt ein Problem das den Zugriff mittels Remote Code Execution ermöglicht. Dadurch lassen sich erweiterte Rechte einrichten und Zugriff auf nicht berechtigte Verzeichnisse und Dateien erlangen. Betroffen sind die stable Zeige 4.3, 4.4 und 4.5

Samba 4.3.13,  4.4.8, 4.5.3 Release Notes

This is a security release in order to address the following defects:

o CVE-2016-2123 (Samba NDR Parsing ndr_pull_dnsp_name Heap-based Buffer
Overflow Remote Code Execution Vulnerability).
o CVE-2016-2125 (Unconditional privilege delegation to Kerberos servers in
trusted realms).
o CVE-2016-2126 (Flaws in Kerberos PAC validation can trigger privilege
elevation).

=======
Details
=======

o CVE-2016-2123:
The Samba routine ndr_pull_dnsp_name contains an integer wrap problem,
leading to an attacker-controlled memory overwrite. ndr_pull_dnsp_name
parses data from the Samba Active Directory ldb database. Any user
who can write to the dnsRecord attribute over LDAP can trigger this
memory corruption.

By default, all authenticated LDAP users can write to the dnsRecord
attribute on new DNS objects. This makes the defect a remote privilege
escalation.

o CVE-2016-2125
Samba client code always requests a forwardable ticket
when using Kerberos authentication. This means the
target server, which must be in the current or trusted
domain/realm, is given a valid general purpose Kerberos
„Ticket Granting Ticket“ (TGT), which can be used to
fully impersonate the authenticated user or service.

o CVE-2016-2126
A remote, authenticated, attacker can cause the winbindd process
to crash using a legitimate Kerberos ticket due to incorrect
handling of the arcfour-hmac-md5 PAC checksum.

A local service with access to the winbindd privileged pipe can
cause winbindd to cache elevated access permissions.

Changes since 4.3.12:
———————

o Volker Lendecke <vl@samba.org>
* BUG 12409: CVE-2016-2123: Fix DNS vuln ZDI-CAN-3995.

o Stefan Metzmacher <metze@samba.org>
* BUG 12445: CVE-2016-2125: Don’t send delegated credentials to all servers.
* BUG 12446: CVE-2016-2126: auth/kerberos: Only allow known checksum types in
check_pac_checksum().

Changes since 4.4.7:
——————–

o Volker Lendecke <vl@samba.org>
* BUG 12409: CVE-2016-2123: Fix DNS vuln ZDI-CAN-3995.

o Stefan Metzmacher <metze@samba.org>
* BUG 12445: CVE-2016-2125: Don’t send delegated credentials to all servers.
* BUG 12446: CVE-2016-2126: auth/kerberos: Only allow known checksum types in
check_pac_checksum().

Changes since 4.5.2:
——————–

o Volker Lendecke <vl@samba.org>
* BUG 12409: CVE-2016-2123: Fix DNS vuln ZDI-CAN-3995.

o Stefan Metzmacher <metze@samba.org>
* BUG 12445: CVE-2016-2125: Don’t send delegated credentials to all servers.
* BUG 12446: CVE-2016-2126: auth/kerberos: Only allow known checksum types in
check_pac_checksum().

https://www.samba.org/samba/history/samba-4.3.13.html
https://www.samba.org/samba/history/samba-4.4.8.html
https://www.samba.org/samba/history/samba-4.5.3.html

 

 

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