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Amazon Linux AMI : samba (ALAS-2017-909)

high Nessus Plugin ID 103822

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Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

Server memory information leak over SMB1 :

An information leak flaw was found in the way SMB1 protocol was implemented by Samba. A malicious client could use this flaw to dump server memory contents to a file on the samba share or to a shared printer, though the exact area of server memory cannot be controlled by the attacker. (CVE-2017-12163)

SMB2 connections don't keep encryption across DFS redirects

A flaw was found in the way samba client used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack. (CVE-2017-12151)

Some code path don't enforce smb signing, when they should

It was found that samba did not enforce 'SMB signing' when certain configuration options were enabled. A remote attacker could launch a man-in-the-middle attack and retrieve information in plain-text.
(CVE-2017-12150)

Solution

Run 'yum update samba' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2017-909.html

Plugin Details

Severity: High

ID: 103822

File Name: ala_ALAS-2017-909.nasl

Version: 3.5

Type: local

Agent: unix

Published: 10/13/2017

Updated: 10/1/2018

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

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

CVSS v3

Risk Factor: High

Base Score: 7.4

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libsmbclient, p-cpe:/a:amazon:linux:samba, p-cpe:/a:amazon:linux:samba-pidl, p-cpe:/a:amazon:linux:libwbclient, p-cpe:/a:amazon:linux:samba-common-libs, p-cpe:/a:amazon:linux:samba-libs, p-cpe:/a:amazon:linux:samba-winbind-krb5-locator, p-cpe:/a:amazon:linux:samba-python, p-cpe:/a:amazon:linux:ctdb-tests, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:samba-test, p-cpe:/a:amazon:linux:samba-client-libs, p-cpe:/a:amazon:linux:ctdb, p-cpe:/a:amazon:linux:samba-test-libs, p-cpe:/a:amazon:linux:libwbclient-devel, p-cpe:/a:amazon:linux:samba-winbind-clients, p-cpe:/a:amazon:linux:samba-krb5-printing, p-cpe:/a:amazon:linux:samba-winbind, p-cpe:/a:amazon:linux:samba-debuginfo, p-cpe:/a:amazon:linux:samba-client, p-cpe:/a:amazon:linux:samba-common-tools, p-cpe:/a:amazon:linux:samba-devel, p-cpe:/a:amazon:linux:samba-common, p-cpe:/a:amazon:linux:libsmbclient-devel, p-cpe:/a:amazon:linux:samba-winbind-modules

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Patch Publication Date: 10/13/2017

Reference Information

CVE: CVE-2017-12150, CVE-2017-12151, CVE-2017-12163

ALAS: 2017-909