Oracle Linux 7 : samba (ELSA-2021-2313)

medium Nessus Plugin ID 150425
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Oracle Linux host is missing a security update.

Description

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-2313 advisory.

- 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

Update the affected packages.

See Also

https://linux.oracle.com/errata/ELSA-2021-2313.html

Plugin Details

Severity: Medium

ID: 150425

File Name: oraclelinux_ELSA-2021-2313.nasl

Version: 1.3

Type: local

Agent: unix

Published: 6/9/2021

Updated: 6/25/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2021-20254

VPR

Risk Factor: Medium

Score: 6

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:oracle:linux:7, p-cpe:/a:oracle:linux:ctdb, p-cpe:/a:oracle:linux:ctdb-tests, p-cpe:/a:oracle:linux:libsmbclient, p-cpe:/a:oracle:linux:libsmbclient-devel, p-cpe:/a:oracle:linux:libwbclient, p-cpe:/a:oracle:linux:libwbclient-devel, p-cpe:/a:oracle:linux:samba, p-cpe:/a:oracle:linux:samba-client, p-cpe:/a:oracle:linux:samba-client-libs, p-cpe:/a:oracle:linux:samba-common, p-cpe:/a:oracle:linux:samba-common-libs, p-cpe:/a:oracle:linux:samba-common-tools, p-cpe:/a:oracle:linux:samba-dc, p-cpe:/a:oracle:linux:samba-dc-libs, p-cpe:/a:oracle:linux:samba-devel, p-cpe:/a:oracle:linux:samba-krb5-printing, p-cpe:/a:oracle:linux:samba-libs, p-cpe:/a:oracle:linux:samba-pidl, p-cpe:/a:oracle:linux:samba-python, p-cpe:/a:oracle:linux:samba-python-test, p-cpe:/a:oracle:linux:samba-test, p-cpe:/a:oracle:linux:samba-test-libs, p-cpe:/a:oracle:linux:samba-vfs-glusterfs, p-cpe:/a:oracle:linux:samba-winbind, p-cpe:/a:oracle:linux:samba-winbind-clients, p-cpe:/a:oracle:linux:samba-winbind-krb5-locator, p-cpe:/a:oracle:linux:samba-winbind-modules

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2021

Vulnerability Publication Date: 4/29/2021

Reference Information

CVE: CVE-2021-20254

IAVA: 2021-A-0208