Ubuntu 14.04 LTS : Linux kernel (Wily HWE) vulnerabilities (USN-2908-2)

high Nessus Plugin ID 88898

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-2908-2 advisory.

- The Linux kernel before 4.4.1 allows local users to bypass file-descriptor limits and cause a denial of service (memory consumption) by sending each descriptor over a UNIX socket before closing it, related to net/unix/af_unix.c and net/unix/garbage.c. (CVE-2013-4312)

- The fuse_fill_write_pages function in fs/fuse/file.c in the Linux kernel before 4.4 allows local users to cause a denial of service (infinite loop) via a writev system call that triggers a zero length for the first segment of an iov. (CVE-2015-8785)

- The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.
(CVE-2016-1575)

- The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program. (CVE-2016-1576)

- Race condition in arch/x86/mm/tlb.c in the Linux kernel before 4.4.1 allows local users to gain privileges by triggering access to a paging structure by a different CPU. (CVE-2016-2069)

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-2908-2

Plugin Details

Severity: High

ID: 88898

File Name: ubuntu_USN-2908-2.nasl

Version: 2.18

Type: local

Agent: unix

Published: 2/23/2016

Updated: 1/9/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, 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-2016-1576

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-4.2.0-30-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.2.0-30-powerpc64-smp, cpe:/o:canonical:ubuntu_linux:14.04:-:lts

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: 2/22/2016

Vulnerability Publication Date: 2/8/2016

Reference Information

CVE: CVE-2013-4312, CVE-2015-8785, CVE-2016-1575, CVE-2016-1576, CVE-2016-2069

USN: 2908-2