Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.14.204 |
| Redhat | Openshift Container Platform | 4.4 |
| Redhat | Enterprise Linux | 5.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1900844Issue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=nextExploitPatchVendor Advisory
- https://www.openwall.com/lists/oss-security/2020/10/09/1ExploitMailing ListPatch
- https://www.openwall.com/lists/oss-security/2020/11/23/2Mailing ListThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1900844Issue TrackingPatchThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=nextExploitPatchVendor Advisory
- https://www.openwall.com/lists/oss-security/2020/10/09/1ExploitMailing ListPatch
- https://www.openwall.com/lists/oss-security/2020/11/23/2Mailing ListThird Party Advisory
FAQ
What is CVE-2020-27777?
CVE-2020-27777 is a vulnerability with a CVSS score of 6.7 (MEDIUM). 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 (...
How severe is CVE-2020-27777?
CVE-2020-27777 has been rated MEDIUM with a CVSS base score of 6.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-27777?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Redhat Openshift Container Platform, Redhat Enterprise Linux.