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Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3742-1)

medium Nessus Plugin ID 111753

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Synopsis

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

Description

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3742-1 advisory.

 It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

 It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620)

 Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information.
 (CVE-2017-18344)

 Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390)

 Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391)

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-3742-1

Plugin Details

Severity: Medium

ID: 111753

File Name: ubuntu_USN-3742-1.nasl

Version: 1.20

Type: local

Agent: unix

Published: 8/15/2018

Updated: 3/26/2025

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: 6.6

CVSS v2

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

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

CVSS Score Source: CVE-2018-3646

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.4

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-powerpc-e500mc, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-powerpc64-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-155-powerpc-e500

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: 8/14/2018

Vulnerability Publication Date: 7/26/2018

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391

USN: 3742-1