SB2021111201 - Debian update for samba
Published: November 12, 2021 Updated: March 22, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 secuirty vulnerabilities.
1) Improper access control (CVE-ID: CVE-2016-2124)
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to SMB1 client connections can be downgraded to plaintext authentication. A remote attacker can perform a man-in-the-middle attack and downgrade a negotiated SMB1 client connection and its capabitilities.
2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-25717)
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to the Windows Active Directory (AD) domains have by default a feature to allow users to create computer accounts. A remote authenticated attacker can create such account with elevated privileges on the system.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-25718)
The vulnerability allows a remote authenticated attacker to escalate privileges on the system.
The vulnerability exists due to Samba AD DC does not correctly sandbox Kerberos tickets issued by an RODC, which leads to security restrictions bypass and privilege escalation.
4) Race condition (CVE-ID: CVE-2020-25719)
The vulnerability allows a remote user to escalate privileges on the system.
The vulnerability exists due to a race condition. A remote administrator can exploit the race and escalate privileges on the system.
5) Improper Authentication (CVE-ID: CVE-2020-25721)
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests. A remote attacker can bypass authentication process and gain unauthorized access to the application.
6) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-25722)
The vulnerability allows a remote authenticated attacker to escalate privileges on the system.
The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation.
7) Use-after-free (CVE-ID: CVE-2021-3738)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Samba AD DC RPC server. A remote authenticated attacker can gain elevated privileges and perform a denial of service (DoS) attack.
8) Input validation error (CVE-ID: CVE-2021-23192)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the DCE/RPC fragment injection issue. A remote attacker can replace subsequent fragments in requests with their own data and alter the server behavior.
Remediation
Install update from vendor's website.