RHSA-2023:6744MediumCVSS 9.1

Red Hat Security Advisory: samba security update

Published
November 7, 2023
Last Modified
July 27, 2026

🔗 CVE IDs covered (3)

CVE-2023-42669 →CVE-2023-3961 →CVE-2023-4091 →

📋 Description

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

🎯 Affected products200

  • Red Hat CodeReady Linux Builder (v. 9)
  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-0:4.18.6-101.el9_3.s390x as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.i686 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat CodeReady Linux Builder (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.s390x as a component of Red Hat CodeReady Linux Builder (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.s390x as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • ctdb-debuginfo-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat Enterprise Linux Resilient Storage (v. 9)
  • libnetapi-0:4.18.6-101.el9_3.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • libnetapi-0:4.18.6-101.el9_3.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • libnetapi-0:4.18.6-101.el9_3.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • libnetapi-0:4.18.6-101.el9_3.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • libnetapi-0:4.18.6-101.el9_3.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • libnetapi-debuginfo-0:4.18.6-101.el9_3.aarch64 as a component of Red Hat CodeReady Linux Builder (v. 9)
  • +170 more not shown

✅ Remediation

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. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: The vulnerability is most commonly associated with the "acl_xattr" module and can be mitigated by setting: ~~~ "acl_xattr:ignore system acls = no" ~~~ Workaround: To mitigate this vulnerability, disable rpcecho service on the AD DC by setting: ~~~ dcerpc endpoint servers = -rpcecho ~~~

🔗 References (6)