Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-2849-1)

high Nessus Plugin ID 87532
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Synopsis

The remote Ubuntu host is missing one or more security-related patches.

Description

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 sanity 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 sanity 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)

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected linux-image-3.16-generic, linux-image-3.16-generic-lpae and / or linux-image-3.16-lowlatency packages.

See Also

https://usn.ubuntu.com/2849-1/

Plugin Details

Severity: High

ID: 87532

File Name: ubuntu_USN-2849-1.nasl

Version: 2.15

Type: local

Agent: unix

Published: 12/21/2015

Updated: 1/19/2021

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 4.2

Vector: AV:L/AC:L/Au:S/C:P/I:P/A:C

Temporal Vector: E:U/RL:OF/RC:C

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: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-3.16-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.16-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-3.16-lowlatency, cpe:/o:canonical:ubuntu_linux:14.04

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

USN: 2849-1