SB2023032171 - SUSE update for xen

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Processor optimization removal or modification of security-critical code (CVE-ID: CVE-2022-42331)

The vulnerability allows an attacker to escalate privileges on the system.

The vulnerability exists due to an oversight in the very original Spectre/Meltdown security work (XSA-254) caused by an unprotected RET instruction. An attacker with access to the guest OS can infer the contents of arbitrary host memory, including memory assigned to other guests.

2) Use-after-free (CVE-ID: CVE-2022-42332)

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when guests are running in the shadow mode. An attacker with access to the guest OS can trigger a use-after-free error and escalate privileges on the system.

3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-42333)

The vulnerability allows an attacker to perform a denial of service attack or escalate privileges on the system.

The vulnerability exists due to mishandling of pinned cache attributes, related to unbound number of controlled regions. An attacker controlling HVM guests can perform a denial of service (DoS) attack and potentially escalate privileges.

4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2022-42334)

The vulnerability allows an attacker to perform a denial of service attack or escalate privileges on the system.

The vulnerability exists due to mishandling of pinned cache attributes, related to improper serialization of installation and removal of regions. An attacker controlling HVM guests can perform a denial of service (DoS) attack and potentially escalate privileges.

Remediation

Install update from vendor's website.

References

• https://www.suse.com/support/update/announcement/2023/suse-su-20230845-1/