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ALSA-2023:6744 — Moderate: samba security update

Affected: AlmaLinux:9: ctdb, AlmaLinux:9: libnetapi, AlmaLinux:9: libnetapi-devel, AlmaLinux:9: libsmbclient, AlmaLinux:9: libsmbclient-devel, AlmaLinux:9: libwbclient, AlmaLinux:9: libwbclient-devel, AlmaLinux:9: python3-samba, AlmaLinux:9: python3-samba-dc, AlmaLinux:9: python3-samba-devel and 24 more

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.

bdu:2023-06941

certfr-2023-avi-0831 — De multiples vulnérabilités ont été découvertes dans Samba. Elles permettent à un attaquant…

certfr-2023-avi-0831

EUVD-2026-261518

fkie_cve-2023-4091

A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.

GHSA-f6jj-3gjw-frjm

gsd-2023-4091

OESA-2023-1753 — samba security update

Affected: openEuler:20.03-LTS-SP1: samba

Samba is a suite of programs for Linux and Unix to interoperate with Windows. Security Fix(es): A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.(CVE-2023-4091) A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services a…

RHSA-2023:6209 — Red Hat Security Advisory: samba security update

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

RHSA-2023:6744 — Red Hat Security Advisory: samba security update

UBUNTU-CVE-2023-4091

Affected: Ubuntu:Pro:14.04:LTS: samba, Ubuntu:Pro:16.04:LTS: samba, Ubuntu:Pro:18.04:LTS: samba, Ubuntu:20.04:LTS: samba, Ubuntu:22.04:LTS: samba, Ubuntu:24.04:LTS: samba

WID-SEC-W-2023-2620 — Samba: Mehrere Schwachstellen

Ein entfernter anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Samba ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen, Dateien zu manipulieren oder vertrauliche Informationen offenzulegen.