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

high Nessus Plugin ID 147972

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Synopsis

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

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is 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 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-4883-1

Plugin Details

Severity: High

ID: 147972

File Name: ubuntu_USN-4883-1.nasl

Version: 1.5

Type: local

Agent: unix

Published: 3/23/2021

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: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2021-27365

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-: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-4.4.0-1090-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-4.4.0-206-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-powerpc64-emb, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-206-powerpc64-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1148-raspi2

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

Exploit Available: true

Exploit Ease: 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