RHSA-2021:4843 - Security Advisory

Topic

An update for samba is now available for Red Hat Gluster Storage 3.5 for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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: SMB1 client connections can be downgraded to plaintext authentication (CVE-2016-2124)
• samba: Subsequent DCE/RPC fragment injection vulnerability (CVE-2021-23192)
• samba: A user in an AD Domain could become root on domain members (CVE-2020-25717)

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.

All users of Samba with Red Hat Gluster Storage are advised to upgrade to these updated packages.

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.

For details on migrating Samba/CTDB configuration files, refer to:

https://access.redhat.com/solutions/4311261

Affected Products

• Red Hat Gluster Storage Server for On-premise 3 for RHEL 8 x86_64

Fixes

• BZ - 2019660 - CVE-2016-2124 samba: SMB1 client connections can be downgraded to plaintext authentication
• BZ - 2019666 - CVE-2021-23192 samba: Subsequent DCE/RPC fragment injection vulnerability
• BZ - 2019672 - CVE-2020-25717 samba: A user in an AD Domain could become root on domain members

CVEs

• CVE-2016-2124
• CVE-2020-25717
• CVE-2021-23192

References

• https://access.redhat.com/security/updates/classification/#important