SB2024021902 - Gentoo update for Samba
Published: February 19, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 11 secuirty vulnerabilities.
1) Improper access control (CVE-ID: CVE-2018-14628)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to improper access restrictions when Samba is an Active Directory Domain Controller. When a domain was provisioned with an unpatched Samba version, the ntSecurityDescriptor is simply inherited from Domain/Partition-HEAD-Object instead of being very strict (as on a Windows provisioned domain). This means also non privileged users can use the LDAP_SERVER_SHOW_DELETED_OID control in order to view, the names and preserved attributes of deleted objects.
2) Out-of-bounds read (CVE-ID: CVE-2022-2127)
The vulnerability allows a remote attacker to gain access to sensitive information or perform denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in winbindd_pam_auth_crap.c in winbind AUTH_CRAP when performing NTLM authentication. A remote attacker can trigger an out-of-bounds read error and gain access to sensitive information or crash the server.
3) Security features bypass (CVE-ID: CVE-2023-3347)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to SMB2 packet signing feature is not enforced if the server is configured with the "server signing = required" option or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. A remote attacker can intercept and manipulate data.
4) Improper Authorization (CVE-ID: CVE-2023-3961)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to improper input validation when handling client pipe names. A remote attacker can provide a specially crafted pipe name containing directory traversal characters and force Samba to connect to Unix domain sockets outside of the private directory meant to restrict the services a client could connect to.The connection to Unix domain sockets is performed as root, which means that if client sends a pipe name that resolved to an external service using an existing Unix
domain socket, the client is able to connect to it without
any filesystem restrictions.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2023-4091)
The vulnerability allows a remote user to truncate read-only files.
The vulnerability exists due to an error in the way SMB protocol implementation in Samba handles file operations. A remote user can request read-only access to files and then truncate them to 0 bytes by opening files with OVERWRITE disposition when using the acl_xattr Samba VFS module with the smb.conf setting "acl_xattr:ignore system acls = yes".
6) Information disclosure (CVE-ID: CVE-2023-4154)
The vulnerability allows a remote user to gain access to potentially sensitive information.
The vulnerability exists due to a design error in Samba's implementation of the DirSync control, which can allow replication of critical domain passwords and secrets by Active Directory accounts authorized to do some replication, but not to replicate sensitive attributes. A remote user can obtain sensitive information from the AD DC and compromise the Active Directory.
7) Infinite loop (CVE-ID: CVE-2023-34966)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop when parsing Spotlight mdssvc RPC packets. A remote attacker can consume all available system resources and cause denial of service conditions on servers where Spotlight is explicitly enabled globally or on individual shares with "spotlight = yes".
8) Type Confusion (CVE-ID: CVE-2023-34967)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a type confusion error when parsing Spotlight mdssvc RPC packets. A remote attacker can send specially crafted data to the server, trigger a type confusion error and crash the server.
9) Information disclosure (CVE-ID: CVE-2023-34968)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application. A remote attacker can send a specially crafted RPC request to the server and obtain real server-side share path.
10) Resource management error (CVE-ID: CVE-2023-42669)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to inclusion of the "rpcecho" server into production build, which can call sleep() on AD DC. A remote user can request the server block using the "rpcecho" server and perform a denial of service (DoS) attack.
11) Resource management error (CVE-ID: CVE-2023-42670)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources within the application when Samba RPC server is under load, which can lead to incorrect start of servers not built for the AD DC. A remote user can cause a high load to Samba RPC server and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.