Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4883-1)

high Nessus Plugin ID 147972

Synopsis

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

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4883-1 advisory.

- An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables. (CVE-2021-27363)

- An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages. (CVE-2021-27364)

- An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message. (CVE-2021-27365)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-4883-1

Plugin Details

Severity: High

ID: 147972

File Name: ubuntu_USN-4883-1.nasl

Version: 1.2

Type: local

Agent: unix

Published: 3/23/2021

Updated: 3/23/2021

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-27365

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1067-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1081-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1087-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1095-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1096-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1098-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1110-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-139-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-139-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-139-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1088-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1090-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1124-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1152-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-hwe, p-cpe:/a:canonical:ubuntu_linux:linux-image-aws-lts-18.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-azure-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-azure-lts-18.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-gcp-lts-18.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-16.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-hwe-16.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-16.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-hwe-16.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-lts-utopic, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-lts-vivid, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-lts-wily, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lpae-lts-xenial, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lts-utopic, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lts-vivid, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lts-wily, p-cpe:/a:canonical:ubuntu_linux:linux-image-generic-lts-xenial, p-cpe:/a:canonical:ubuntu_linux:linux-image-gke, p-cpe:/a:canonical:ubuntu_linux:linux-image-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-hwe-16.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-lts-utopic, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-lts-vivid, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-lts-wily, p-cpe:/a:canonical:ubuntu_linux:linux-image-lowlatency-lts-xenial, p-cpe:/a:canonical:ubuntu_linux:linux-image-oem, p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-oracle-lts-18.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-16.04, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-hwe-16.04-edge, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-lts-utopic, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-lts-vivid, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-lts-wily, p-cpe:/a:canonical:ubuntu_linux:linux-image-virtual-lts-xenial

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/20/2021

Vulnerability Publication Date: 3/7/2021

Reference Information

CVE: CVE-2021-27363, CVE-2021-27364, CVE-2021-27365

USN: 4883-1