Bug 1900844 (CVE-2020-27777)
| Summary: | CVE-2020-27777 kernel: powerpc: RTAS calls can be used to compromise kernel integrity | ||
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| Product: | [Other] Security Response | Reporter: | Guilherme de Almeida Suckevicz <gsuckevi> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | acaringi, adscvr, airlied, bhu, blc, bmasney, brdeoliv, bskeggs, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mjg59, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, walters, williams |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel 5.10-rc1 | Doc Type: | If docs needed, set a value |
| Doc Text: |
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.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-08-31 11:57:33 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1900845, 1906443, 1906444, 1906445, 1912473 | ||
| Bug Blocks: | 1888425, 1927621 | ||
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Description
Guilherme de Almeida Suckevicz
2020-11-23 20:30:01 UTC
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1900845] This was fixed for Fedora with the 5.9 stable kernel rebases. Statement: This issue is rated as having Moderate impact due to the required privileges and hardware dependencies. External References: https://www.openwall.com/lists/oss-security/2020/10/09/1 https://www.openwall.com/lists/oss-security/2020/11/23/2 https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764 Mitigation: 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. Acknowledgments: Name: Daniel Axtens (IBM) This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2021:3327 https://access.redhat.com/errata/RHSA-2021:3327 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-27777 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:4356 https://access.redhat.com/errata/RHSA-2021:4356 |