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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4887-1)

high Nessus Plugin ID 148034

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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-4887-1 advisory.

 De4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker could use this to expose sensitive information (kernel memory) or possibly execute arbitrary code.
 (CVE-2021-3444)

 Adam Nichols discovered that heap overflows existed in the iSCSI subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
 (CVE-2021-27365)

 Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly compute a speculative execution limit on pointer arithmetic in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-27171)

 Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly apply speculative execution limits on some pointer types. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-27170)

 Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did not properly restrict access to iSCSI transport handles. A local attacker could use this to cause a denial of service or expose sensitive information (kernel pointer addresses). (CVE-2021-27363)

 Adam Nichols discovered that an out-of-bounds read existed in the iSCSI subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information (kernel memory). (CVE-2021-27364)

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-4887-1

Plugin Details

Severity: High

ID: 148034

File Name: ubuntu_USN-4887-1.nasl

Version: 1.6

Type: local

Agent: unix

Published: 3/24/2021

Updated: 8/28/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2021-3444

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-5.4.0-1041-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1043-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3.0-72-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.6.0-1052-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1032-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3.0-72-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-48-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3.0-1041-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-70-generic-lpae, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-70-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1040-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-48-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-48-generic-64k, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1039-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-70-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.10.0-1019-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.3.0-1038-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1036-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1012-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-48-generic-lpae

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: 3/23/2021

Vulnerability Publication Date: 3/7/2021

Reference Information

CVE: CVE-2020-27170, CVE-2020-27171, CVE-2021-27363, CVE-2021-27364, CVE-2021-27365, CVE-2021-3444

USN: 4887-1