Missing Authorization Affecting kernel-tools-devel package, versions <0:4.14.209-160.335.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNELTOOLSDEVEL-1691817
- published 27 Sep 2021
- disclosed 15 Dec 2020
Introduced: 15 Dec 2020
CVE-2020-27777 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel-tools-devel to version 0:4.14.209-160.335.amzn2 or higher.
This issue was patched in ALAS2-2020-1566.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27777
- 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