Debian DLA-2970-1 : qemu - LTS security update

high Nessus Plugin ID 159511

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2970 advisory.

- A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device.
This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability. (CVE-2021-20196)

- An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0. (CVE-2021-3593)

- A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process. (CVE-2021-3748)

- An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
(CVE-2021-3930)

- A flaw was found in the vhost-vsock device of QEMU. In case of error, an invalid element was not detached from the virtqueue before freeing its memory, leading to memory leakage and other unexpected results.
Affected QEMU versions <= 6.2.0. (CVE-2022-26354)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the qemu packages.

For Debian 9 stretch, these problems have been fixed in version 1

Plugin Details

Severity: High

ID: 159511

File Name: debian_DLA-2970.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 4/5/2022

Updated: 1/9/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-3748

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-kvm:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-user:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-user-static:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-utils:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-guest-agent:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-arm:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-common:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-mips:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-misc:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-ppc:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-sparc:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-system-x86:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-user-binfmt:*:*:*:*:*:*:*, p-cpe:2.3:a:debian:debian_linux:qemu-block-extra:*:*:*:*:*:*:*

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 4/4/2022

Vulnerability Publication Date: 5/26/2021

Reference Information

CVE: CVE-2021-20196, CVE-2021-3593, CVE-2021-3748, CVE-2021-3930, CVE-2022-26354