SUSE SLED15 / SLES15 Security Update : samba and ldb (SUSE-SU-2021:3647-1)

high Nessus Plugin ID 155048

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Synopsis

The remote SUSE host is missing one or more security updates.

Description

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3647-1 advisory.

- 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 the way samba, as an Active Directory Domain Controller, is able to support an RODC (read-only domain controller). This would allow an RODC to print administrator tickets. (CVE-2020-25718)

- A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name- based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise. (CVE-2020-25719)

- Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.
(CVE-2020-25721)

- Multiple flaws were found in the way samba AD DC implemented access and conformance checking of stored data. An attacker could use this flaw to cause total domain compromise. (CVE-2020-25722)

- A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements. (CVE-2021-23192)

- In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use- after-free could instead allow different user state to be pointed at and this might allow more privileged access. (CVE-2021-3738)

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

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 155048

File Name: suse_SU-2021-3647-1.nasl

Version: 1.9

Type: local

Agent: unix

Family: SuSE Local Security Checks

Published: 11/11/2021

Updated: 7/13/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2020-25719

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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:U/RL:O/RC:C

CVSS Score Source: CVE-2021-3738

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:libsamba-policy0-python3, p-cpe:/a:novell:suse_linux:libnetapi0, p-cpe:/a:novell:suse_linux:libsamba-passdb0, p-cpe:/a:novell:suse_linux:libsamdb-devel, p-cpe:/a:novell:suse_linux:libsamdb0-32bit, p-cpe:/a:novell:suse_linux:samba-ldb-ldap, p-cpe:/a:novell:suse_linux:libdcerpc-samr0, p-cpe:/a:novell:suse_linux:libsamba-errors0, p-cpe:/a:novell:suse_linux:ldb-tools, p-cpe:/a:novell:suse_linux:libndr-nbt-devel, p-cpe:/a:novell:suse_linux:samba-libs, p-cpe:/a:novell:suse_linux:libndr-standard0, p-cpe:/a:novell:suse_linux:libnetapi0-32bit, p-cpe:/a:novell:suse_linux:libsamba-util-devel, p-cpe:/a:novell:suse_linux:libwbclient0-32bit, p-cpe:/a:novell:suse_linux:libsamba-util0, p-cpe:/a:novell:suse_linux:libndr-krb5pac0-32bit, p-cpe:/a:novell:suse_linux:libsmbconf-devel, p-cpe:/a:novell:suse_linux:libldb2-32bit, p-cpe:/a:novell:suse_linux:libsmbclient-devel, p-cpe:/a:novell:suse_linux:samba-ceph, p-cpe:/a:novell:suse_linux:libsamba-credentials0, p-cpe:/a:novell:suse_linux:libdcerpc0, p-cpe:/a:novell:suse_linux:libndr1, p-cpe:/a:novell:suse_linux:libsamba-policy-python3-devel, p-cpe:/a:novell:suse_linux:libndr-standard0-32bit, p-cpe:/a:novell:suse_linux:libndr1-32bit, p-cpe:/a:novell:suse_linux:samba-winbind, p-cpe:/a:novell:suse_linux:libsamba-errors-devel, p-cpe:/a:novell:suse_linux:libsamba-hostconfig0-32bit, p-cpe:/a:novell:suse_linux:libsamba-credentials-devel, p-cpe:/a:novell:suse_linux:libtevent-util0-32bit, p-cpe:/a:novell:suse_linux:samba-client, p-cpe:/a:novell:suse_linux:libsamba-hostconfig-devel, p-cpe:/a:novell:suse_linux:libsamba-policy-devel, p-cpe:/a:novell:suse_linux:libndr-nbt0, p-cpe:/a:novell:suse_linux:libndr-standard-devel, p-cpe:/a:novell:suse_linux:libsamba-hostconfig0, p-cpe:/a:novell:suse_linux:libwbclient0, p-cpe:/a:novell:suse_linux:libsamba-passdb-devel, p-cpe:/a:novell:suse_linux:libsamba-util0-32bit, p-cpe:/a:novell:suse_linux:libdcerpc-binding0, p-cpe:/a:novell:suse_linux:libsmbldap-devel, p-cpe:/a:novell:suse_linux:libsamba-errors0-32bit, p-cpe:/a:novell:suse_linux:samba, p-cpe:/a:novell:suse_linux:libldb2, p-cpe:/a:novell:suse_linux:libdcerpc0-32bit, p-cpe:/a:novell:suse_linux:python3-ldb-devel, p-cpe:/a:novell:suse_linux:libsmbldap2-32bit, p-cpe:/a:novell:suse_linux:samba-ad-dc, p-cpe:/a:novell:suse_linux:libndr-devel, p-cpe:/a:novell:suse_linux:samba-winbind-32bit, p-cpe:/a:novell:suse_linux:samba-python3, cpe:/o:novell:suse_linux:15, p-cpe:/a:novell:suse_linux:libnetapi-devel, p-cpe:/a:novell:suse_linux:samba-libs-32bit, p-cpe:/a:novell:suse_linux:python3-ldb, p-cpe:/a:novell:suse_linux:ctdb, p-cpe:/a:novell:suse_linux:libtevent-util0, p-cpe:/a:novell:suse_linux:libdcerpc-samr-devel, p-cpe:/a:novell:suse_linux:libsmbldap2, p-cpe:/a:novell:suse_linux:libtevent-util-devel, p-cpe:/a:novell:suse_linux:samba-core-devel, p-cpe:/a:novell:suse_linux:libndr-krb5pac0, p-cpe:/a:novell:suse_linux:libndr-krb5pac-devel, p-cpe:/a:novell:suse_linux:libndr-nbt0-32bit, p-cpe:/a:novell:suse_linux:libsamba-credentials0-32bit, p-cpe:/a:novell:suse_linux:libsamba-passdb0-32bit, p-cpe:/a:novell:suse_linux:samba-gpupdate, p-cpe:/a:novell:suse_linux:libsmbconf0-32bit, p-cpe:/a:novell:suse_linux:libsmbclient0, p-cpe:/a:novell:suse_linux:libsamdb0, p-cpe:/a:novell:suse_linux:libldb-devel, p-cpe:/a:novell:suse_linux:samba-libs-python3, p-cpe:/a:novell:suse_linux:libdcerpc-devel, p-cpe:/a:novell:suse_linux:samba-dsdb-modules, p-cpe:/a:novell:suse_linux:libsmbconf0, p-cpe:/a:novell:suse_linux:libwbclient-devel, p-cpe:/a:novell:suse_linux:libdcerpc-binding0-32bit

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2021

Vulnerability Publication Date: 11/9/2021

Reference Information

CVE: CVE-2016-2124, CVE-2020-25717, CVE-2020-25718, CVE-2020-25719, CVE-2020-25721, CVE-2020-25722, CVE-2021-23192, CVE-2021-3738

IAVA: 2021-A-0554-S

SuSE: SUSE-SU-2021:3647-1

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