Missing Authorization Affecting perf package, versions <0:4.18.0-348.el8
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Test your applications- Snyk ID SNYK-RHEL8-PERF-4187486
- published 26 Jul 2021
- disclosed 8 Oct 2020
Introduced: 8 Oct 2020
CVE-2020-27777 Open this link in a new tabHow to fix?
Upgrade RHEL:8 perf to version 0:4.18.0-348.el8 or higher.
This issue was patched in RHSA-2021:4356.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.
See How to fix? for RHEL:8 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
- https://access.redhat.com/security/cve/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
- https://access.redhat.com/errata/RHSA-2021:4356