Moderate: samba security update

Topic

An update for samba is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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: smbd allows client access to unix domain sockets on the file system as root (CVE-2023-3961)
• samba: SMB clients can truncate files with read-only permissions (CVE-2023-4091)
• samba: "rpcecho" development server allows denial of service via sleep() call on AD DC (CVE-2023-42669)

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.

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.

Affected Products

• Red Hat Enterprise Linux Resilient Storage for x86_64 9 x86_64
• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux Resilient Storage for IBM z Systems 9 s390x
• Red Hat Enterprise Linux Resilient Storage for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for x86_64 9 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 9 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 9 s390x

Fixes

• BZ - 2241881 - CVE-2023-3961 samba: smbd allows client access to unix domain sockets on the file system as root
• BZ - 2241882 - CVE-2023-4091 samba: SMB clients can truncate files with read-only permissions
• BZ - 2241884 - CVE-2023-42669 samba: "rpcecho" development server allows denial of service via sleep() call on AD DC

CVEs

• CVE-2023-3961
• CVE-2023-4091
• CVE-2023-42669

References

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