CVE-2020-27777 — Missing Authorization in Kernel

CWE-862 — Missing Authorization11 documents8 sources
Severity
6.7MEDIUMNVD
EPSS
0.0%
top 92.46%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Linux KernelRedhat Enterprise LinuxRedhat Openshift Container Platform
Timeline
PublishedDec 15
Latest updateMay 24

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 vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HExploitability: 0.8 | Impact: 5.9

Affected Packages3 packages

▶NVDlinux/linux_kernel4.15 — 4.19.155+3
▶Debianlinux/linux_kernel< 5.9.6-1+3
▶CVEListV5linux/linux_kernelkernel 5.10-rc1

Also affects: Openshift Container Platform 4.4, 4.5, 4.6, Enterprise Linux 5.0, 6.0, 7.0, 8.0

Patches

Patch: bugzilla.redhat.com ↗Patch: git.kernel.org ↗Patch: www.openwall.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-w5hm-w8cx-wrwr: A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication↗2022-05-24
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OSV
CVE-2020-27777: A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication↗2020-12-15
▶
CVEList
CVE-2020-27777: A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication↗2020-12-15
▶

📋Vendor Advisories

7
Ubuntu
Linux kernel vulnerabilities↗2021-02-25
▶
Ubuntu
Linux kernel vulnerabilities↗2021-01-28
▶
Ubuntu
Linux kernel vulnerabilities↗2021-01-06
▶
Ubuntu
Linux kernel vulnerabilities↗2021-01-06
▶
Microsoft
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 (↗2020-12-08
▶
CVE-2020-27777 — Missing Authorization in Linux Kernel | cvebase