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RedhatCVE-2020-27777

HistoryDec 15, 2020 - 5:15 p.m.

CVE-2020-27777

2020-12-1517:15:14

CWE-862

redhat

web.nvd.nist.gov

353

cve-2020-27777

rtas

memory access

userspace

kernel communication

local user privilege

powervm

kvm hypervisor

pseries platform

nvd

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

6.7

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

AI Score

6.8

Confidence

High

EPSS

Percentile

5.1%

JSON

A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange<4.14.204

linuxlinux_kernelRange4.15–4.19.155

linuxlinux_kernelRange4.20–5.4.75

linuxlinux_kernelRange5.5–5.9.5

Node

redhatopenshift_container_platformMatch4.4

redhatopenshift_container_platformMatch4.5

redhatopenshift_container_platformMatch4.6

redhatenterprise_linuxMatch5.0

redhatenterprise_linuxMatch6.0

redhatenterprise_linuxMatch7.0

redhatenterprise_linuxMatch8.0

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhatopenshift_container_platform4.4cpe:2.3:a:redhat:openshift_container_platform:4.4:*:*:*:*:*:*:*
redhatopenshift_container_platform4.5cpe:2.3:a:redhat:openshift_container_platform:4.5:*:*:*:*:*:*:*
redhatopenshift_container_platform4.6cpe:2.3:a:redhat:openshift_container_platform:4.6:*:*:*:*:*:*:*
redhatenterprise_linux5.0cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
redhatenterprise_linux6.0cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhatenterprise_linux7.0cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhatenterprise_linux8.0cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
redhat	openshift_container_platform	4.4	cpe:2.3:a:redhat:openshift_container_platform:4.4:::::::*
redhat	openshift_container_platform	4.5	cpe:2.3:a:redhat:openshift_container_platform:4.5:::::::*
redhat	openshift_container_platform	4.6	cpe:2.3:a:redhat:openshift_container_platform:4.6:::::::*
redhat	enterprise_linux	5.0	cpe:2.3:o:redhat:enterprise_linux:5.0:::::::*
redhat	enterprise_linux	6.0	cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*
redhat	enterprise_linux	7.0	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
redhat	enterprise_linux	8.0	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*

CNA Affected

[
  {
    "product": "kernel",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "kernel 5.10-rc1"
      }
    ]
  }
]