Debian dla-3759 : qemu - security update

high Nessus Plugin ID 191790

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Synopsis

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

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3759 advisory.

- A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. The 9pfs server did not prohibit opening special files on the host side, potentially allowing a malicious client to escape from the exported 9p tree by creating and opening a device file in the shared folder. (CVE-2023-2861)

- A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service. (CVE-2023-3354)

- A bug in QEMU could cause a guest I/O operation otherwise addressed to an arbitrary disk offset to be targeted to offset 0 instead (potentially overwriting the VM's boot code). This could be used, for example, by L2 guests with a virtual disk (vdiskL2) stored on a virtual disk of an L1 (vdiskL1) hypervisor to read and/or write data to LBA 0 of vdiskL1, potentially gaining control of L1 at its next reboot.
(CVE-2023-5088)

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.

Plugin Details

Severity: High

ID: 191790

File Name: debian_DLA-3759.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 3/11/2024

Updated: 6/7/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2023-2861

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.2

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:qemu-utils, p-cpe:/a:debian:debian_linux:qemu-system-x86, p-cpe:/a:debian:debian_linux:qemu-block-extra, p-cpe:/a:debian:debian_linux:qemu-system-gui, p-cpe:/a:debian:debian_linux:qemu-system-data, p-cpe:/a:debian:debian_linux:qemu-user, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:qemu-system-common, p-cpe:/a:debian:debian_linux:qemu-system-misc, p-cpe:/a:debian:debian_linux:qemu-system-mips, p-cpe:/a:debian:debian_linux:qemu-user-binfmt, p-cpe:/a:debian:debian_linux:qemu-user-static, p-cpe:/a:debian:debian_linux:qemu-kvm, p-cpe:/a:debian:debian_linux:qemu-guest-agent, p-cpe:/a:debian:debian_linux:qemu, p-cpe:/a:debian:debian_linux:qemu-system-sparc, p-cpe:/a:debian:debian_linux:qemu-system-arm, p-cpe:/a:debian:debian_linux:qemu-system, p-cpe:/a:debian:debian_linux:qemu-system-ppc

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/11/2024

Vulnerability Publication Date: 7/11/2023

Reference Information

CVE: CVE-2023-2861, CVE-2023-3354, CVE-2023-5088

IAVB: 2023-B-0058-S, 2023-B-0073-S, 2024-B-0022-S

Detections

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