EulerOS 2.0 SP8 : samba (EulerOS-SA-2020-1032)

high Nessus Plugin ID 132625

Synopsis

The remote EulerOS host is missing multiple security updates.

Description

According to the versions of the samba packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

- A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.(CVE-2018-16860)

- All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the (poorly named) dnsserver RPC pipe provides administrative facilities to modify DNS records and zones. Samba, when acting as an AD DC, stores DNS records in LDAP. In AD, the default permissions on the DNS partition allow creation of new records by authenticated users. This is used for example to allow machines to self-register in DNS. If a DNS record was created that case-insensitively matched the name of the zone, the ldb_qsort() and dns_name_compare() routines could be confused into reading memory prior to the list of DNS entries when responding to DnssrvEnumRecords() or DnssrvEnumRecords2() and so following invalid memory as a pointer.(CVE-2019-14861)

- All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.(CVE-2019-14870)

- A flaw was found in the samba client, all samba versions before samba 4.11.2, 4.10.10 and 4.9.15, where a malicious server can supply a pathname to the client with separators. This could allow the client to access files and folders outside of the SMB network pathnames.
An attacker could use this vulnerability to create files outside of the current working directory using the privileges of the client user.(CVE-2019-10218)

- A flaw was found in the way an LDAP search expression could crash the shared LDAP server process of a samba AD DC. An authenticated user, having read permissions on the LDAP server, could use this flaw to cause denial of service.(CVE-2019-3824)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected samba packages.

Plugin Details

Severity: High

ID: 132625

File Name: EulerOS_SA-2020-1032.nasl

Version: 1.6

Type: local

Family: Huawei Local Security Checks

Published: 1/2/2020

Updated: 5/18/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2019-14870

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS Score Source: CVE-2018-16860

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:samba-dc-libs, p-cpe:/a:huawei:euleros:samba-krb5-printing, p-cpe:/a:huawei:euleros:samba-libs, p-cpe:/a:huawei:euleros:samba-pidl, p-cpe:/a:huawei:euleros:samba-test, p-cpe:/a:huawei:euleros:samba-test-libs, p-cpe:/a:huawei:euleros:samba-winbind, p-cpe:/a:huawei:euleros:samba-winbind-clients, p-cpe:/a:huawei:euleros:samba-winbind-krb5-locator, p-cpe:/a:huawei:euleros:samba-winbind-modules, cpe:/o:huawei:euleros:2.0, p-cpe:/a:huawei:euleros:ctdb, p-cpe:/a:huawei:euleros:ctdb-tests, p-cpe:/a:huawei:euleros:libsmbclient, p-cpe:/a:huawei:euleros:libwbclient, p-cpe:/a:huawei:euleros:python2-samba, p-cpe:/a:huawei:euleros:python2-samba-test, p-cpe:/a:huawei:euleros:python3-samba, p-cpe:/a:huawei:euleros:python3-samba-test, p-cpe:/a:huawei:euleros:samba, p-cpe:/a:huawei:euleros:samba-client, p-cpe:/a:huawei:euleros:samba-client-libs, p-cpe:/a:huawei:euleros:samba-common, p-cpe:/a:huawei:euleros:samba-common-libs, p-cpe:/a:huawei:euleros:samba-common-tools

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

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Ease: No known exploits are available

Patch Publication Date: 1/2/2020

Reference Information

CVE: CVE-2018-16860, CVE-2019-10218, CVE-2019-14861, CVE-2019-14870, CVE-2019-3824

Detections

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