Improper Access Control Affecting kernel-bootwrapper package, versions <0:3.10.0-862.el7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-CENTOS7-KERNELBOOTWRAPPER-2101428
- published26 Jul 2021
- disclosed12 Sept 2017
Introduced: 12 Sep 2017
CVE-2017-12154 (opens in a new tab)How to fix?
Upgrade Centos:7 kernel-bootwrapper to version 0:3.10.0-862.el7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-bootwrapper package and not the kernel-bootwrapper package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
References
- http://www.securityfocus.com/bid/100856
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51aa68e7d57e3217192d88ce90fd5b8ef29ec94f
- https://bugzilla.redhat.com/show_bug.cgi?id=1491224
- https://github.com/torvalds/linux/commit/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f
- https://www.spinics.net/lists/kvm/msg155414.html
- https://access.redhat.com/security/cve/CVE-2017-12154
- http://www.debian.org/security/2017/dsa-3981
- https://access.redhat.com/errata/RHSA-2018:1062
- https://usn.ubuntu.com/3698-1/
- https://usn.ubuntu.com/3698-2/