SB2022021023 - SUSE update for ldb, samba
Published: February 10, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 11 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) Security Features (CVE-ID: CVE-2020-17049)
The vulnerability allows a remote user to bypass authentication process.
The vulnerability exists due to security feature bypass issue in Kerberos. A remote administrator can bypass authentication process and gain unauthorized access to the application.
3) 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.
4) 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.
5) 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.
6) 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.
7) 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.
8) Out-of-bounds read (CVE-ID: CVE-2021-20254)
The vulnerability allows a remote user to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when mapping Windows group identities (SIDs) into unix group identities (gids), which resulted into negative idmap cache entries created in the Samba server process token. An attacker who can manage to trigger the vulnerability can crash the Samba server or potentially perform unauthorized actions on the system.
9) 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.
10) 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.
11) Out-of-bounds write (CVE-ID: CVE-2021-44142)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing EA metadata while opening files in smbd within the VFS Samba module (vfs_fruit). A remote attacker with ability to write to file's extended attributes can trigger an out-of-bounds write and execute arbitrary code with root privileges.
Note, the vulnerability in vfs_fruit exists in the default configuration of the fruit VFS module using fruit:metadata=netatalk or fruit:resource=file.
Remediation
Install update from vendor's website.