Reg : Spectre & Meltdown
From: Mohammed Azfar
Date: Mon Jan 15 2018 - 16:14:59 EST
Hi Team
please share your suggestions about this.
I tired an online tool to check the vulnerability of spectre and meltdown, this is after upgrading 4.4.111-1 kernel version in centos 7. But its still showing in vulnerable state, im running this script in AWS instance. Please advice me.
Script : https://raw.githubusercontent.com/speed47/spectre-meltdown-checker/master/spectre-meltdown-checker.sh
Output :
Spectre and Meltdown mitigation detection tool v0.24
Checking for vulnerabilities against live running kernel Linux 4.4.111-1.el7.elrepo.x86_64 #1 SMP Wed Jan 10 13:12:02 EST 2018 x86_64
CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Checking count of LFENCE opcodes in kernel: NO (only 35 opcodes found, should be >= 70)
> STATUS: VULNERABLE (heuristic to be improved when official patches become available)
CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigation 1
* Hardware (CPU microcode) support for mitigation: YES
* Kernel support for IBRS: NO
* IBRS enabled for Kernel space: NO
* IBRS enabled for User space: NO
* Mitigation 2
* Kernel compiled with retpoline option: NO
* Kernel compiled with a retpoline-aware compiler: NO
> STATUS: VULNERABLE (IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability)
CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: YES
> STATUS: NOT VULNERABLE (PTI mitigates the vulnerability)
A false sense of security is worse than no security at all, see --disclaimer
--
Thanks
Mohammed Azfar