high
7.2
CWE
862
Advisory Published
CVE Published
Updated

CVE-2020-27777

First published: Thu Oct 08 2020(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:3.10.0-1160.41.1.el7
0:3.10.0-1160.41.1.el7
redhat/kernel<0:4.18.0-348.el8
0:4.18.0-348.el8
redhat/kernel<5.10
5.10
IBM Data Risk Manager<=2.0.6
Linux Kernel<4.14.204
Linux Kernel>=4.15<4.19.155
Linux Kernel>=4.20<5.4.75
Linux Kernel>=5.5<5.9.5
Red Hat OpenShift Container Platform=4.4
Red Hat OpenShift Container Platform=4.5
Red Hat OpenShift Container Platform=4.6
Red Hat Enterprise Linux=5.0
Red Hat Enterprise Linux=6.0
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.128-1
6.12.20-1
6.12.21-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1900844

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764

Remedy

https://www.openwall.com/lists/oss-security/2020/10/09/1

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-27777?

    CVE-2020-27777 has been classified with a CVSS score indicating high severity due to its potential to allow privilege escalation on affected systems.

  • How do I fix CVE-2020-27777?

    To fix CVE-2020-27777, update affected systems to the patched kernel versions provided by Red Hat or other relevant vendors.

  • Which systems are affected by CVE-2020-27777?

    CVE-2020-27777 affects guest systems running on PowerVM or KVM hypervisors, especially those with Red Hat kernel versions 3.10, 4.18, and up to 5.10.

  • Can non-root users exploit CVE-2020-27777?

    Yes, a local user with limited privileges can exploit CVE-2020-27777 to escalate their privileges on a vulnerable system.

  • Is CVE-2020-27777 specific to any Linux distributions?

    CVE-2020-27777 primarily impacts Red Hat Enterprise Linux and related distributions running vulnerable kernel versions.

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