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Ubuntu 18.04 LTS : Linux kernel vulnerabilities (USN-4209-1)

critical Nessus Plugin ID 131563

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4209-1 advisory.

 - Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow. (CVE-2019-15794)

 - An issue was discovered in net/wireless/nl80211.c in the Linux kernel through 5.2.17. It does not check the length of variable elements in a beacon head, leading to a buffer overflow. (CVE-2019-16746)

 - A memory leak in the nfp_abm_u32_knode_replace() function in drivers/net/ethernet/netronome/nfp/abm/cls.c in the Linux kernel before 5.3.6 allows attackers to cause a denial of service (memory consumption), aka CID-78beef629fd9. NOTE: This has been argued as not a valid vulnerability. The upstream commit 78beef629fd9 was reverted (CVE-2019-19076)

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-4209-1

Plugin Details

Severity: Critical

ID: 131563

File Name: ubuntu_USN-4209-1.nasl

Version: 1.6

Type: local

Agent: unix

Published: 12/3/2019

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: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2019-16746

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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-5.0.0-1008-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1022-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1026-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-1030-oem-osp1, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-37-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-37-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.0.0-37-lowlatency, cpe:/o:canonical:ubuntu_linux:18.04:-: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: 12/2/2019

Vulnerability Publication Date: 9/24/2019

Reference Information

CVE: CVE-2019-15794, CVE-2019-16746, CVE-2019-19076

USN: 4209-1