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Red Hat 7.7: RHSA-2021-3988-01 Moderate Samba Security Fix

red hat
Calendar Grey October 26, 2021
Dist Redhat Esm H88
A Blue Sphere notification reveals a revision for maxdb, indicating a low-level security risk and offering essential details for the update process.
An update for samba is now available for Red Hat Enterprise Linux 7.7 Advanced Update Support, Red Hat Enterprise Linux 7.7 Telco Extended Update Support, and Red Hat Enterprise Li...

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 moderate red hat samba 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 Server AUS (v. 7.7):
Source: samba-4.9.1-11.el7_7.src.rpm
noarch: samba-common-4.9.1-11.el7_7.noarch.rpm
ppc64: libsmbclient-4.9.1-11.el7_7.ppc.rpm libsmbclient-4.9.1-11.el7_7.ppc64.rpm libwbclient-4.9.1-11.el7_7.ppc.rpm libwbclient-4.9.1-11.el7_7.ppc64.rpm samba-4.9.1-11.el7_7.ppc64.rpm samba-client-4.9.1-11.el7_7.ppc64.rpm samba-client-libs-4.9.1-11.el7_7.ppc.rpm samba-client-libs-4.9.1-11.el7_7.ppc64.rpm samba-common-libs-4.9.1-11.el7_7.ppc64.rpm samba-common-tools-4.9.1-11.el7_7.ppc64.rpm samba-debuginfo-4.9.1-11.el7_7.ppc.rpm samba-debuginfo-4.9.1-11.el7_7.ppc64.rpm samba-krb5-printing-4.9.1-11.el7_7.ppc64.rpm samba-libs-4.9.1-11.el7_7.ppc.rpm samba-libs-4.9.1-11.el7_7.ppc64.rpm samba-winbind-4.9.1-11.el7_7.ppc64.rpm samba-winbind-clients-4.9.1-11.el7_7.ppc64.rpm samba-winbind-modules-4.9.1-11.el7_7.ppc.rpm samba-winbind-modules-4.9.1-11.el7_7.ppc64.rpm
ppc64le: libsmbclient-4.9.1-11.el7_7.ppc64le.rpm libwbclient-4.9.1-11.el7_7.ppc64le.rpm samba-4.9.1-11.el7_7.ppc64le.rpm samba-client-4.9.1-11.el7_7.ppc64le.rpm samba-client-libs-4.9.1-11.el7_7.ppc64le.rpm samba-common-libs-4.9.1-11.el7_7.ppc64le.rpm samba-common-tools-4.9.1-11.el7_7.ppc64le.rpm samba-debuginfo-4.9.1-11.el7_7.ppc64le.rpm samba-krb5-printing-4.9.1-11.el7_7.ppc64le.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:3988-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3988
Issue date: 2021-10-26

Topic

An update for samba is now available for Red Hat Enterprise Linux 7.7Advanced Update Support, Red Hat Enterprise Linux 7.7 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.7 Update Services for SAPSolutions.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 moderate red hat samba file sharing

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server E4S (v. 7.7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - noarch, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server TUS (v. 7.7) - noarch, ppc64, 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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