Vulnerability CVE-2020-27777
Published: 2020-12-15

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.

Type:

CWE-862

 (Missing Authorization)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Redhat -> Openshift container platform 
Redhat -> Enterprise linux 
Linux -> Linux kernel 

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