SB2022012207 - openEuler update for kernel

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2021-4203)

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

The vulnerability exists due to a use-after-free error in sock_getsockopt() function in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() function (and connect() function) in the Linux kernel. A local user can exploit the use-after-free error and crash the system or escalate privileges on the system.

2) Information disclosure (CVE-ID: CVE-2021-39633)

The vulnerability allows a local application to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output in OS kernel. A local application can gain unauthorized access to sensitive information on the system.

3) Security restrictions bypass (CVE-ID: CVE-2021-4197)

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

The vulnerability exists due to missing permissions checks within the cgroups (control groups) functionality of Linux Kernel when writing into a file descriptor. A local low privileged process can trick a higher privileged parent process into writing arbitrary data into files, which can result in denial of service or privileges escalation.

4) Use-after-free (CVE-ID: CVE-2021-4202)

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

The vulnerability exists due to a use-after-free error in the nci_request() function in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. A local user can cause a data race problem while the device is getting removed and escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1495