RHEL 7 : kernel-rt (RHSA-2021:3328)

high Nessus Plugin ID 152924
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:3328 advisory.

- kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)

- kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)

- kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS (CVE-2021-29650)

- kernel: race condition for removal of the HCI controller (CVE-2021-32399)

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://cwe.mitre.org/data/definitions/119.html

https://cwe.mitre.org/data/definitions/362.html

https://cwe.mitre.org/data/definitions/662.html

https://cwe.mitre.org/data/definitions/667.html

https://cwe.mitre.org/data/definitions/787.html

https://access.redhat.com/security/cve/CVE-2021-22555

https://access.redhat.com/security/cve/CVE-2021-29154

https://access.redhat.com/security/cve/CVE-2021-29650

https://access.redhat.com/security/cve/CVE-2021-32399

https://access.redhat.com/errata/RHSA-2021:3328

https://bugzilla.redhat.com/1945388

https://bugzilla.redhat.com/1946684

https://bugzilla.redhat.com/1970807

https://bugzilla.redhat.com/1980101

Plugin Details

Severity: High

ID: 152924

File Name: redhat-RHSA-2021-3328.nasl

Version: 1.5

Type: local

Agent: unix

Published: 8/31/2021

Updated: 10/7/2021

Dependencies: ssh_get_info.nasl, redhat_repos.nasl, linux_alt_patch_detect.nasl

Risk Information

CVSS Score Source: CVE-2021-29154

VPR

Risk Factor: Critical

Score: 9.4

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:kernel-rt, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/31/2021

Vulnerability Publication Date: 3/30/2021

Exploitable With

Metasploit (Netfilter x_tables Heap OOB Write Privilege Escalation)

Reference Information

CVE: CVE-2021-22555, CVE-2021-29154, CVE-2021-29650, CVE-2021-32399

RHSA: 2021:3328

CWE: 119, 362, 662, 667, 787