SB2023090232 - openEuler 22.03 LTS update for kernel

Description

This security bulletin contains information about 8 secuirty vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2023-1206)

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

The vulnerability exists due to a hash collision flaw in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when an attacker makes a new kind of SYN flood attack. A remote attacker can increase the CPU usage of the server that accepts IPV6 connections up to 95%.

2) Buffer overflow (CVE-ID: CVE-2023-34319)

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in netback when processing certain packets. A malicious guest can send specially crafted packets to the backend, trigger memory corruption and crash the hypervisor.

3) Out-of-bounds read (CVE-ID: CVE-2023-38432)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in fs/smb/server/smb2misc.c in ksmbd. A remote attacker can send specially crafted packets to the system to trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.

4) Out-of-bounds read (CVE-ID: CVE-2023-3867)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the KSMBD implementation in the Linux kernel. A remote attacker can trigger an out-of-bounds read error and read contents of memory on the system.

5) Use-after-free (CVE-ID: CVE-2023-40283)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the l2cap_sock_release() function in net/bluetooth/l2cap_sock.c. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

6) Type Confusion (CVE-ID: CVE-2023-4194)

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to a type confusion error in TUN/TAP functionality. A local user can bypass network filters and gain unauthorized access to some resources.

The vulnerability exists due to incomplete fix for #VU72742 (CVE-2023-1076).

7) Use-after-free (CVE-ID: CVE-2023-4389)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the btrfs_get_root_ref() function in fs/btrfs/disk-io.c. A local user can trigger a use-after-free error and execute arbitrary code on the system.

8) Type Confusion (CVE-ID: CVE-2023-1076)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a type confusion error during initialization of TUN/TAP sockets. A local user can trigger a type confusion error and execute arbitrary code with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2023-1585