SB2023010634 - openEuler 22.03 LTS update for kernel

Description

This security bulletin contains information about 3 vulnerabilities.

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

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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.

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

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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.

3) Use-after-free (CVE-ID: CVE-2022-47939)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the smb2_tree_disconnect() function in ksmbd. A remote attacker can trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2023-1012