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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel regression (USN-4712-1)

info Nessus Plugin ID 145512

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4712-1 advisory.

 USN-4576-1 fixed a vulnerability in the overlay file system implementation in the Linux kernel.
 Unfortunately, that fix introduced a regression that could incorrectly deny access to overlay files in some situations. This update fixes the problem.

 We apologize for the inconvenience.

 Original vulnerability details:

 Giuseppe Scrivano discovered that the overlay file system in the Linux

 kernel did not properly perform permission checks in some situations. A

 local attacker could possibly use this to bypass intended restrictions and

 gain read access to restricted files.

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

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 kernel package.

See Also

https://ubuntu.com/security/notices/USN-4712-1

Plugin Details

Severity: Info

ID: 145512

File Name: ubuntu_USN-4712-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 1/28/2021

Updated: 8/27/2024

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-41-lowlatency, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-65-lowlatency, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-65-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-65-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-41-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.8.0-41-generic-lpae

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/2/2021

Vulnerability Publication Date: 2/2/2021

Reference Information

USN: 4712-1