SB2023101155 - SUSE update for samba 

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Main Vulnerability Database SB2023101155

SB2023101155 - SUSE update for samba

Published: October 11, 2023

Security Bulletin ID SB2023101155
Severity
High
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 20% Medium 60% Low 20%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) 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.


2) 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".


3) 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.


4) 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.


5) 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.

References