Debian DSA-4135-1 : samba - security update

Medium Nessus Plugin ID 108304

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities have been discovered in Samba, a SMB/CIFS file, print, and login server for Unix. The Common Vulnerabilities and Exposures project identifies the following issues :

- CVE-2018-1050 It was discovered that Samba is prone to a denial of service attack when the RPC spoolss service is configured to be run as an external daemon.

https://www.samba.org/samba/security/CVE-2018-1050.html

- CVE-2018-1057 Bjoern Baumbach from Sernet discovered that on Samba 4 AD DC the LDAP server incorrectly validates permissions to modify passwords over LDAP allowing authenticated users to change any other users passwords, including administrative users.

https://www.samba.org/samba/security/CVE-2018-1057.html

https://wiki.samba.org/index.php/CVE-2018-1057

Solution

Upgrade the samba packages.

For the oldstable distribution (jessie), CVE-2018-1050 will be addressed in a later update. Unfortunately the changes required to fix CVE-2018-1057 for Debian oldstable are too invasive to be backported.
Users using Samba as an AD-compatible domain controller are encouraged to apply the workaround described in the Samba wiki and upgrade to Debian stretch.

For the stable distribution (stretch), these problems have been fixed in version 2:4.5.12+dfsg-2+deb9u2.

See Also

https://security-tracker.debian.org/tracker/CVE-2018-1050

https://www.samba.org/samba/security/CVE-2018-1050.html

https://security-tracker.debian.org/tracker/CVE-2018-1057

https://www.samba.org/samba/security/CVE-2018-1057.html

https://wiki.samba.org/index.php/CVE-2018-1057

https://security-tracker.debian.org/tracker/source-package/samba

https://packages.debian.org/source/stretch/samba

https://www.debian.org/security/2018/dsa-4135

Plugin Details

Severity: Medium

ID: 108304

File Name: debian_DSA-4135.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2018/03/14

Updated: 2018/11/13

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS v3.0

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:samba, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Patch Publication Date: 2018/03/13

Reference Information

CVE: CVE-2018-1050, CVE-2018-1057

DSA: 4135