Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3405-1)

high Nessus Plugin ID 102818

Synopsis

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

Description

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3405-1 advisory.

- The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot. (CVE-2015-7837)

- The mq_notify function in the Linux kernel through 4.11.9 does not set the sock pointer to NULL upon entry into the retry logic. During a user-space close of a Netlink socket, it allows attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact. (CVE-2017-11176)

- fs/ext4/inode.c in the Linux kernel before 4.6.2, when ext4 data=ordered mode is used, mishandles a needs- flushing-before-commit list, which allows local users to obtain sensitive information from other users' files in opportunistic circumstances by waiting for a hardware reset, creating a new file, making write system calls, and reading this file. (CVE-2017-7495)

- The brcmf_cfg80211_mgmt_tx function in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux kernel before 4.12.3 allows local users to cause a denial of service (buffer overflow and system crash) or possibly gain privileges via a crafted NL80211_CMD_FRAME Netlink packet. (CVE-2017-7541)

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-3405-1

Plugin Details

Severity: High

ID: 102818

File Name: ubuntu_USN-3405-1.nasl

Version: 3.13

Type: local

Agent: unix

Published: 8/29/2017

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: Critical

Score: 9.2

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS Score Source: CVE-2017-7541

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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:H/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1028-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1032-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1071-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1073-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-93-powerpc64-smp, cpe:/o:canonical:ubuntu_linux:16.04:-: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: 8/28/2017

Vulnerability Publication Date: 5/15/2017

Reference Information

CVE: CVE-2015-7837, CVE-2017-11176, CVE-2017-7495, CVE-2017-7541

USN: 3405-1