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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5210-1)

high Nessus Plugin ID 156481

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Synopsis

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

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5210-1 advisory.

 - The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.
 (CVE-2020-26541)

 - A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system.
 (CVE-2021-20321)

 - A flaw was found in the Linux kernel. A use-after-free vulnerability in the NFC stack can lead to a threat to confidentiality, integrity, and system availability. (CVE-2021-3760)

 - A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data. (CVE-2021-4002)

 - prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds write. (CVE-2021-41864)

 - An issue was discovered in the Linux kernel for powerpc before 5.14.15. It allows a malicious KVM guest to crash the host, when the host is running on Power8, due to an arch/powerpc/kvm/book3s_hv_rmhandlers.S implementation bug in the handling of the SRR1 register values. (CVE-2021-43056)

 - An issue was discovered in the Linux kernel before 5.14.15. There is an array-index-out-of-bounds flaw in the detach_capi_ctr function in drivers/isdn/capi/kcapi.c. (CVE-2021-43389)

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-5210-1

Plugin Details

Severity: High

ID: 156481

File Name: ubuntu_USN-5210-1.nasl

Version: 1.9

Type: local

Agent: unix

Published: 1/6/2022

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: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2021-3760

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

CVSS Score Source: CVE-2021-41864

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1010-ibm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1023-bluefield, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1029-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1048-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1051-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1057-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1059-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1059-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1061-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1065-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-92-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-92-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-92-lowlatency

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: 1/6/2022

Vulnerability Publication Date: 10/2/2020

Reference Information

CVE: CVE-2020-26541, CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43056, CVE-2021-43389

USN: 5210-1