SB2022051042 - Debian update for qemu
Published: May 10, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Integer overflow (CVE-ID: CVE-2021-4206)
The vulnerability allows a local user to escalate privileges on the target system.
The vulnerability exists due to integer overflow in the cursor_alloc() function in the QXL display device emulation in QEMU. A privileged user can crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.
2) Race condition (CVE-ID: CVE-2021-4207)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in the QXL display device emulation in QEMU. A privileged user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
3) Incorrect default permissions (CVE-ID: CVE-2022-0358)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to incorrect QEMU virtio-fs shared file system daemon (virtiofsd) implementation. An attacker on the guest OS can create files in the directories shared by virtio-fs with unintended group ownership in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of the group. This can lead to privilege escalation within the guest OS.
The vulnerability exists due to incomplete fox for #VU13631 (CVE-2018-13405).
4) Use-after-free (CVE-ID: CVE-2022-26353)
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the virtio-net device of QEMU. A privileged user can exploit this issue to crash QEMU or potentially execute arbitrary code with elevated privileges.
5) Improper Resource Shutdown or Release (CVE-ID: CVE-2022-26354)
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists in the vhost-vsock device of QEMU. A local user can trigger the error and gain access to sensitive information.
Remediation
Install update from vendor's website.