Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5015-1)

high Nessus Plugin ID 151921

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5015-1 advisory.

- A flaw double-free memory corruption in the Linux kernel HCI device initialization subsystem was found in the way user attach malicious HCI TTY Bluetooth device. A local user could use this flaw to crash the system. This flaw affects all the Linux kernel versions starting from 3.13. (CVE-2021-3564)

- Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use- after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.
(CVE-2021-28691)

- fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05. (CVE-2021-33909)

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

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-5015-1

Plugin Details

Severity: High

ID: 151921

File Name: ubuntu_USN-5015-1.nasl

Version: 1.7

Type: local

Agent: unix

Published: 7/22/2021

Updated: 1/7/2022

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

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2021-33909

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-buildinfo-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-headers-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-headers-oem-20.04, p-cpe:/a:canonical:ubuntu_linux:linux-headers-oem-20.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-headers-oem-20.04b, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-20.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-20.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-oem-20.04b, p-cpe:/a:canonical:ubuntu_linux:linux-image-unsigned-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-modules-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-oem-20.04, p-cpe:/a:canonical:ubuntu_linux:linux-oem-20.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-oem-20.04b, p-cpe:/a:canonical:ubuntu_linux:linux-oem-5.10-headers-5.10.0-1038, p-cpe:/a:canonical:ubuntu_linux:linux-oem-5.10-tools-5.10.0-1038, p-cpe:/a:canonical:ubuntu_linux:linux-oem-5.10-tools-host, p-cpe:/a:canonical:ubuntu_linux:linux-tools-5.10.0-1038-oem, p-cpe:/a:canonical:ubuntu_linux:linux-tools-oem-20.04, p-cpe:/a:canonical:ubuntu_linux:linux-tools-oem-20.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-tools-oem-20.04b

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/20/2021

Vulnerability Publication Date: 5/26/2021

Reference Information

CVE: CVE-2021-3564, CVE-2021-3573, CVE-2021-28691, CVE-2021-33909

USN: 5015-1

IAVA: 2021-A-0350