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RedHat: RHSA-2021-4866 Moderate: Samba File Server Security Issue

red hat
Calendar Grey November 30, 2021
Dist Redhat Esm H88
Debian DSA-2021-3245: Apache update resolves vulnerabilities related to session handling in web server processes for Ubuntu 20.04.
An update for samba is now available for Red Hat Enterprise Linux 8.2 Extended Update Support

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: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token (CVE-2021-20254)
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 Red Hat samba moderate impact update instructions file sharing

References

https://access.redhat.com/security/cve/CVE-2021-20254 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.2):
Source: samba-4.11.2-15.el8_2.src.rpm
aarch64: ctdb-4.11.2-15.el8_2.aarch64.rpm ctdb-debuginfo-4.11.2-15.el8_2.aarch64.rpm ctdb-tests-4.11.2-15.el8_2.aarch64.rpm ctdb-tests-debuginfo-4.11.2-15.el8_2.aarch64.rpm libsmbclient-4.11.2-15.el8_2.aarch64.rpm libsmbclient-debuginfo-4.11.2-15.el8_2.aarch64.rpm libwbclient-4.11.2-15.el8_2.aarch64.rpm libwbclient-debuginfo-4.11.2-15.el8_2.aarch64.rpm python3-samba-4.11.2-15.el8_2.aarch64.rpm python3-samba-debuginfo-4.11.2-15.el8_2.aarch64.rpm python3-samba-test-4.11.2-15.el8_2.aarch64.rpm samba-4.11.2-15.el8_2.aarch64.rpm samba-client-4.11.2-15.el8_2.aarch64.rpm samba-client-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-client-libs-4.11.2-15.el8_2.aarch64.rpm samba-client-libs-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-common-libs-4.11.2-15.el8_2.aarch64.rpm samba-common-libs-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-common-tools-4.11.2-15.el8_2.aarch64.rpm samba-common-tools-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-debugsource-4.11.2-15.el8_2.aarch64.rpm samba-krb5-printing-4.11.2-15.el8_2.aarch64.rpm samba-krb5-printing-debuginfo-4.11.2-15.el8_2.aarch64.rpm samba-libs-4.11.2-15.el8_2.aarch64.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:4866-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4866
Issue date: 2021-11-30

Topic

An update for samba is now available for Red Hat Enterprise Linux 8.2Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat samba moderate impact update instructions file sharing

Relevant Releases Architectures

Red Hat CodeReady Linux Builder EUS (v. 8.2) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux BaseOS EUS (v. 8.2) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

1949442 - CVE-2021-20254 samba: Negative idmap cache entries can cause incorrect group entries in the Samba file server process token

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