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Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4076-1)

high Nessus Plugin ID 127097

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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-4076-1 advisory.

 - An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free. (CVE-2018-20836)

 - A flaw was found in the Linux kernel's freescale hypervisor manager implementation, kernel versions 5.0.x up to, excluding 5.0.17. A parameter passed to an ioctl was incorrectly validated and used in size calculations for the page size calculation. An attacker can use this flaw to crash the system, corrupt memory, or create other adverse security affects. (CVE-2019-10142)

 - fs/ext4/extents.c in the Linux kernel through 5.1.2 does not zero out the unused memory region in the extent tree block, which might allow local users to obtain sensitive information by reading uninitialized data in the filesystem. (CVE-2019-11833)

 - The do_hidp_sock_ioctl function in net/bluetooth/hidp/sock.c in the Linux kernel before 5.0.15 allows a local user to obtain potentially sensitive information from kernel stack memory via a HIDPCONNADD command, because a name field may not end with a '\0' character. (CVE-2019-11884)

 - In the seccomp implementation prior to kernel version 4.8, there is a possible seccomp bypass due to seccomp policies that allow the use of ptrace. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android Versions: Android kernel Android ID: A-119769499 (CVE-2019-2054)

 - The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system.
 More typically, this vulnerability will result in denial-of-service conditions. (CVE-2019-9503)

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-4076-1

Plugin Details

Severity: High

ID: 127097

File Name: ubuntu_USN-4076-1.nasl

Version: 1.9

Type: local

Agent: unix

Published: 7/26/2019

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: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

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

CVSS Score Source: CVE-2018-20836

CVSS v3

Risk Factor: High

Base Score: 8.3

Temporal Score: 7.2

Vector: CVSS:3.0/AV:A/AC:H/PR:N/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-2019-9503

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1052-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1088-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1117-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-157-powerpc64-smp, cpe:/o:canonical:ubuntu_linux:16.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/25/2019

Vulnerability Publication Date: 5/7/2019

Reference Information

CVE: CVE-2018-20836, CVE-2019-10142, CVE-2019-11833, CVE-2019-11884, CVE-2019-2054, CVE-2019-9503

USN: 4076-1