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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5091-1)

high Nessus Plugin ID 153769

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5091-1 advisory.

 Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack.
 An attacker could use this to expose sensitive information. (CVE-2021-33624)

 It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679)

 Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576)

 It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160)

 Michael Wakabayashi discovered that the NFSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199)

 It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

Solution

Update the affected kernel package.

See Also

https://ubuntu.com/security/notices/USN-5091-1

Plugin Details

Severity: High

ID: 153769

File Name: ubuntu_USN-5091-1.nasl

Version: 1.6

Type: local

Agent: unix

Published: 9/28/2021

Updated: 8/28/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2021-38160

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-88-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-88-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1059-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-87-generic, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1057-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-88-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-87-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-87-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1047-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1024-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1053-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1055-oracle

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/28/2021

Vulnerability Publication Date: 6/23/2021

Reference Information

CVE: CVE-2021-33624, CVE-2021-3679, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38204

USN: 5091-1