SB2022122604 - Multiple vulnerabilities in Linux kernel ksmbd

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Main Vulnerability Database SB2022122604

SB2022122604 - Multiple vulnerabilities in Linux kernel ksmbd

Published: December 26, 2022

Security Bulletin ID SB2022122604
Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 secuirty vulnerabilities.


1) Out-of-bounds read (CVE-ID: CVE-2022-47943)

The vulnerability allows a remote user to perform a denial of service attack.

The vulnerability exists due to an out-of-bounds read in ksmbd due to a large length in the zero DataOffset case in SMB2_WRITE call. A remote user can send specially crafted request to the ksmbd daemon, trigger an out-of-bounds write error and perform a denial of service (DoS) attack.


2) Out-of-bounds read (CVE-ID: CVE-2022-47938)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in SMB2_TREE_CONNECT in fs/ksmbd/smb2misc.c. A remote user can send specially crafted request to the ksmbd  daemon, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.


3) Heap-based buffer overflow (CVE-ID: CVE-2022-47942)

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in set_ntacl_dacl, related to use of SMB2_QUERY_INFO_HE after a malformed SMB2_SET_INFO_HE command. A remote user can send specially crafted data to the ksmbd daemon, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


4) Memory leak (CVE-ID: CVE-2022-47941)

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in fs/ksmbd/smb2pdu.c in Linux kernel ksmbd when handling certain smb2_handle_negotiate() error conditions. A remote attacker can force the system to leak memory and perform denial of service attack.


Remediation

Install update from vendor's website.

References