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Red Hat 8 RHSA-2021-5082 Critical Security Issue with Samba Software

red hat
Calendar Grey December 13, 2021
Dist Redhat Esm H88
A crucial Samba security update for Red Hat Enterprise Linux 8 addresses serious vulnerabilities. Users must install this promptly to protect systems against exploits.
An update for samba is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted automatically.

Summary

Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.
Security Fix(es):
* samba: Active Directory (AD) domain user could become root on domain members (CVE-2020-25717)
* samba: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124)
* samba: Subsequent DCE/RPC fragment injection vulnerability (CVE-2021-23192)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Topics%20covered

Topics Covered

security advisory security issue red hat samba important linux server message block

References

https://access.redhat.com/security/cve/CVE-2016-2124 https://access.redhat.com/security/cve/CVE-2020-25717 https://access.redhat.com/security/cve/CVE-2021-23192 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux AppStream (v. 8):
aarch64: ctdb-debuginfo-4.14.5-7.el8_5.aarch64.rpm libsmbclient-debuginfo-4.14.5-7.el8_5.aarch64.rpm libwbclient-debuginfo-4.14.5-7.el8_5.aarch64.rpm python3-samba-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-client-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-client-libs-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-common-libs-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-common-tools-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-debugsource-4.14.5-7.el8_5.aarch64.rpm samba-krb5-printing-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-libs-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-test-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-test-libs-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-vfs-iouring-4.14.5-7.el8_5.aarch64.rpm samba-vfs-iouring-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-winbind-clients-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-winbind-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-winbind-krb5-locator-debuginfo-4.14.5-7.el8_5.aarch64.rpm samba-winbind-modules-debuginfo-4.14.5-7.el8_5.aarch64.rpm
ppc64le: ctdb-debuginfo-4.14.5-7.el8_5.ppc64le.rpm libsmbclient-debuginfo-4.14.5-7.el8_5.ppc64le.rpm libwbclient-debuginfo-4.14.5-7.el8_5.ppc64le.rpm python3-samba-debuginfo-4.14.5-7.el8_5.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:5082-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:5082
Issue date: 2021-12-13

Topic

An update for samba is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security issue red hat samba important linux server message block

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

2019660 - CVE-2016-2124 samba: SMB1 client connections can be downgraded to plaintext authentication

2019666 - CVE-2021-23192 samba: Subsequent DCE/RPC fragment injection vulnerability

2019672 - CVE-2020-25717 samba: Active Directory (AD) domain user could become root on domain members

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