CVE-2020-27777

 

Published at: - 15-12-2020 06:15

Last modified: - 26-10-2022 01:44

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764
• https://www.openwall.com/lists/oss-security/2020/11/23/2
• https://www.openwall.com/lists/oss-security/2020/10/09/1
• https://bugzilla.redhat.com/show_bug.cgi?id=1900844

 

Keywords

NVD

 

CVE-2020-27777

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures