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Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-2848-1)

high Nessus Plugin ID 87531

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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-2848-1 advisory.

 Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of service (crash the host) or potentially execute arbitrary code on the host. (CVE-2015-8550)

 Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the host. (CVE-2015-8551)

 Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the device's state. An attacker could exploit this flaw to cause a denial of service by flooding the logging system with WARN() messages causing the initial domain to exhaust disk space. (CVE-2015-8552)

 Jann Horn discovered a ptrace issue with user namespaces in the Linux kernel. The namespace owner could potentially exploit this flaw by ptracing a root owned process entering the user namespace to elevate its privileges and potentially gain access outside of the namespace. (http://bugs.launchpad.net/bugs/1527374, CVE-2015-8709)

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-2848-1

Plugin Details

Severity: High

ID: 87531

File Name: ubuntu_USN-2848-1.nasl

Version: 2.18

Type: local

Agent: unix

Published: 12/21/2015

Updated: 8/27/2024

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: 6.9

Temporal Score: 5.1

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

CVSS Score Source: CVE-2015-8709

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

CVSS Score Source: CVE-2015-8550

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-powerpc64-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-powerpc-e500, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-74-generic

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/19/2015

Vulnerability Publication Date: 4/13/2016

Reference Information

CVE: CVE-2015-8550, CVE-2015-8551, CVE-2015-8552, CVE-2015-8709

USN: 2848-1