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Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4135-1)

high Nessus Plugin ID 129049

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Synopsis

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

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4135-1 advisory.

 - A buffer overflow flaw was found, in versions from 2.6.34 to 5.2.x, in the way Linux kernel's vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host. (CVE-2019-14835)

 - In the Linux kernel through 5.2.14 on the powerpc platform, a local user can read vector registers of other users' processes via a Facility Unavailable exception. To exploit the venerability, a local user starts a transaction (via the hardware transactional memory instruction tbegin) and then accesses vector registers. At some point, the vector registers will be corrupted with the values from a different local Linux process because of a missing arch/powerpc/kernel/process.c check. (CVE-2019-15030)

 - In the Linux kernel through 5.2.14 on the powerpc platform, a local user can read vector registers of other users' processes via an interrupt. To exploit the venerability, a local user starts a transaction (via the hardware transactional memory instruction tbegin) and then accesses vector registers. At some point, the vector registers will be corrupted with the values from a different local Linux process, because MSR_TM_ACTIVE is misused in arch/powerpc/kernel/process.c. (CVE-2019-15031)

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-4135-1

Plugin Details

Severity: High

ID: 129049

File Name: ubuntu_USN-4135-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 9/19/2019

Updated: 1/9/2024

Supported Sensors: Agentless 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: 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-2019-14835

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: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1025-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1044-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1046-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1047-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1050-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1056-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1059-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1064-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-64-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-64-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-64-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1058-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1094-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1122-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1126-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-164-powerpc64-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1017-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1020-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-29-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-29-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-29-lowlatency, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts

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: 9/18/2019

Vulnerability Publication Date: 9/13/2019

Reference Information

CVE: CVE-2019-14835, CVE-2019-15030, CVE-2019-15031

USN: 4135-1