CVE-2020-27777

Aliases:UBUNTU-CVE-2020-27777DEBIAN-CVE-2020-27777
Advisory lineage Upstream: 0 Downstream: 37
Modified
Published: 15 Dec 2020, 16:57
Last modified:04 Aug 2024, 16:25

Vulnerability Summary

Overall Risk (default)
medium
39/100
CVSS Score
7.2 HIGH
v2.0 (nvd)
EPSS Score
0.48% LOW
0% probability +0.45%
KEV
Not listed
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

15 Dec 2020, 16:57
Published
Vulnerability first disclosed
04 Aug 2024, 16:25
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.48%• Percentile: 40%

Techniques & Countermeasures

  • CWE-862•Missing Authorization

    The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected Systems

  • debian•linux

    < 5.9.6-1 | < 5.9.6-1 | < 5.9.6-1 | < 5.9.6-1

  • ubuntu•linux

    all | < 4.4.0-201.233 | < 4.15.0-129.132 | < 5.4.0-59.65

  • ubuntu•linux-aws-fips

    < 4.15.0-2034.35 | all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-azure-fde

    all

  • ubuntu•linux-azure-fde-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    < 4.15.0-2016.18 | all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-dell300x

    < 4.15.0-1010.14

  • ubuntu•linux-fips

    < 4.4.0-1055.61 | all | < 4.15.0-1049.56

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1033.35~18.04.1

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1008.9~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-129.132~16.04.1 | all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-59.65~18.04.1

  • ubuntu•linux-hwe-5.8

    < 5.8.0-44.50~20.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-lts-xenial

    < 4.4.0-201.233~14.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • linux•linux_kernel

    < 4.14.204 | ≥ 4.15, < 4.19.155 | ≥ 4.20, < 5.4.75 | ≥ 5.5, < 5.9.5

  • redhat•enterprise_linux

    5.0 | 6.0 | 7.0 | 8.0

  • redhat•openshift_container_platform

    4.4 | 4.5 | 4.6

References (13)