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Amazon Linux AMI : samba (ALAS-2022-1564)

high Nessus Plugin ID 158192

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Synopsis

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

Description

The version of samba installed on the remote host is prior to 4.10.16-18.59. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2022-1564 advisory.

 - The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide ...enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver. Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root. (CVE-2021-44142)

 - A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required.
 (CVE-2016-2124)

 - A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation. (CVE-2020-25717)

 - A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.
 (CVE-2021-20254)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update samba' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2022-1564.html

https://alas.aws.amazon.com/cve/html/CVE-2016-2124.html

https://alas.aws.amazon.com/cve/html/CVE-2020-25717.html

https://alas.aws.amazon.com/cve/html/CVE-2021-20254.html

https://alas.aws.amazon.com/cve/html/CVE-2021-44142.html

Plugin Details

Severity: High

ID: 158192

File Name: ala_ALAS-2022-1564.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2/19/2022

Updated: 2/3/2023

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

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.8

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

CVSS Score Source: CVE-2021-44142

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 8.4

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

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

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-python-test, 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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/10/2022

Vulnerability Publication Date: 4/29/2021

Reference Information

CVE: CVE-2016-2124, CVE-2020-25717, CVE-2021-20254, CVE-2021-44142

ALAS: 2022-1564

IAVA: 2021-A-0208-S, 2022-A-0054-S