Test Kennung:	1.3.6.1.4.1.25623.1.1.10.2023.0340
Kategorie:	Mageia Linux Local Security Checks
Titel:	Mageia: Security Advisory (MGASA-2023-0340)
Zusammenfassung:	The remote host is missing an update for the 'samba' package(s) announced via the MGASA-2023-0340 advisory.
Beschreibung:	Summary: The remote host is missing an update for the 'samba' package(s) announced via the MGASA-2023-0340 advisory. Vulnerability Insight: This update fixes the security issues below. A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients to remote procedure call (RPC) services like SAMR LSA or SPOOLSS, which Samba initiates on demand. However, due to inadequate sanitization of incoming client pipe names, allowing a client to send a pipe name containing Unix directory traversal characters (../). This could result in SMB clients connecting as root to Unix domain sockets outside the private directory. If an attacker or client managed to send a pipe name resolving to an external service using an existing Unix domain socket, it could potentially lead to unauthorized access to the service and consequential adverse events, including compromise or service crashes. (CVE-2023-3961) 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 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 and leading to a complete denial of service on the AD DC. The DoS affects all other services as 'rpcecho' runs in the main RPC task. (CVE-2023-42669) Apart from the new version, a Recommends for cifs-client was added in samba-client for [link moved to references] Affected Software/OS: 'samba' package(s) on Mageia 9. Solution: Please install the updated package(s). CVSS Score: 10.0 CVSS Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Querverweis:	Common Vulnerability Exposure (CVE) ID: CVE-2023-3961 RHBZ#2241881 https://bugzilla.redhat.com/show_bug.cgi?id=2241881 RHSA-2023:6209 https://access.redhat.com/errata/RHSA-2023:6209 RHSA-2023:6744 https://access.redhat.com/errata/RHSA-2023:6744 RHSA-2023:7371 https://access.redhat.com/errata/RHSA-2023:7371 RHSA-2023:7408 https://access.redhat.com/errata/RHSA-2023:7408 RHSA-2023:7464 https://access.redhat.com/errata/RHSA-2023:7464 RHSA-2023:7467 https://access.redhat.com/errata/RHSA-2023:7467 https://access.redhat.com/security/cve/CVE-2023-3961 https://bugzilla.samba.org/show_bug.cgi?id=15422 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/ https://security.netapp.com/advisory/ntap-20231124-0002/ https://www.samba.org/samba/security/CVE-2023-3961.html Common Vulnerability Exposure (CVE) ID: CVE-2023-4091 RHBZ#2241882 https://bugzilla.redhat.com/show_bug.cgi?id=2241882 https://access.redhat.com/security/cve/CVE-2023-4091 https://bugzilla.samba.org/show_bug.cgi?id=15439 https://lists.debian.org/debian-lts-announce/2024/04/msg00015.html https://www.samba.org/samba/security/CVE-2023-4091.html Common Vulnerability Exposure (CVE) ID: CVE-2023-42669 RHBZ#2241884 https://bugzilla.redhat.com/show_bug.cgi?id=2241884 https://access.redhat.com/security/cve/CVE-2023-42669 https://bugzilla.samba.org/show_bug.cgi?id=15474 https://www.samba.org/samba/security/CVE-2023-42669.html
Copyright	Copyright (C) 2023 Greenbone AG

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