CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'

Bug #1743812 reported by Cristian Aravena Romero on 2018-01-17
28
This bug affects 4 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
High
Unassigned
Artful
High
Unassigned

Bug Description

Hello,

I'm testing script:
https://www.tecmint.com/check-and-patch-meltdown-cpu-vulnerability-in-linux/

:~/spectre-meltdown-checker$ sudo ./spectre-meltdown-checker.sh
[sudo] password for caravena:
Spectre and Meltdown mitigation detection tool v0.31

Checking for vulnerabilities against running kernel Linux 4.13.0-30-generic #33-Ubuntu SMP Mon Jan 15 19:45:48 UTC 2018 x86_64
CPU is Intel(R) Core(TM) i3-2377M CPU @ 1.50GHz

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Checking count of LFENCE opcodes in kernel: YES
> STATUS: NOT VULNERABLE (114 opcodes found, which is >= 70, 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
* The SPEC_CTRL MSR is available: NO
* The SPEC_CTRL CPUID feature bit is set: NO
* Kernel support for IBRS: YES
* 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
* Checking if we're running under Xen PV (64 bits): NO
> STATUS: NOT VULNERABLE (PTI mitigates the vulnerability)

A false sense of security is worse than no security at all, see --disclaimer

Regards,
--
Cristian

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.13.0-30-generic 4.13.0-30.33
ProcVersionSignature: Ubuntu 4.13.0-30.33-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: caravena 1689 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 17 13:18:45 2018
InstallationDate: Installed on 2017-10-13 (96 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.13.0-30-generic root=UUID=707d0f89-4b1d-4432-9d50-6058dc4c1ee9 ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.13.0-30-generic N/A
 linux-backports-modules-4.13.0-30-generic N/A
 linux-firmware 1.170
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.family: ChiefRiver System
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

CVE References

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
tags: added: artful
dino99 (9d9) wrote :
Changed in linux (Ubuntu):
status: Confirmed → Triaged
importance: Undecided → Critical
Changed in linux (Ubuntu Artful):
status: New → Triaged
importance: Undecided → Critical
tags: added: pti
Changed in linux (Ubuntu):
importance: Critical → High
Changed in linux (Ubuntu Artful):
importance: Critical → High

Hello,

:~/spectre-meltdown-checker$ sudo ./spectre-meltdown-checker.sh
Spectre and Meltdown mitigation detection tool v0.34+

Checking for vulnerabilities on current system
Kernel is Linux 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:23:35 UTC 2018 x86_64
CPU is Intel(R) Core(TM) i3-2377M CPU @ 1.50GHz

Hardware check
* Hardware support (CPU microcode) for mitigation techniques
  * Indirect Branch Restricted Speculation (IBRS)
    * SPEC_CTRL MSR is available: NO
    * CPU indicates IBRS capability: NO
  * Indirect Branch Prediction Barrier (IBPB)
    * PRED_CMD MSR is available: NO
    * CPU indicates IBPB capability: NO
  * Single Thread Indirect Branch Predictors (STIBP)
    * SPEC_CTRL MSR is available: NO
    * CPU indicates STIBP capability: NO
  * Enhanced IBRS (IBRS_ALL)
    * CPU indicates ARCH_CAPABILITIES MSR availability: NO
    * ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO
  * CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): NO
  * CPU microcode is known to cause stability problems: NO (model 42 stepping 7 ucode 0x29)
* CPU vulnerability to the three speculative execution attacks variants
  * Vulnerable to Variant 1: YES
  * Vulnerable to Variant 2: YES
  * Vulnerable to Variant 3: YES

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active)
* Kernel has array_index_mask_nospec: YES (1 occurence(s) found of 64 bits array_index_mask_nospec())
> STATUS: NOT VULNERABLE (Mitigation: __user pointer sanitization)

CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active)
* Mitigation 1
  * Kernel is compiled with IBRS/IBPB support: NO
  * Currently enabled features
    * IBRS enabled for Kernel space: NO
    * IBRS enabled for User space: NO
    * IBPB enabled: NO
* Mitigation 2
  * Kernel compiled with retpoline option: YES
  * Kernel compiled with a retpoline-aware compiler: YES (kernel reports full retpoline compilation)
> STATUS: NOT VULNERABLE (Mitigation: Full generic retpoline)

CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active)
* Kernel supports Page Table Isolation (PTI): YES
* PTI enabled and active: YES
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (Mitigation: PTI)

Regards,
--
Cristian

Virtualbox is tracked in bug 1736116

This bug was nominated against a series that is no longer supported, ie artful. The bug task representing the artful nomination is being closed as Won't Fix.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu Artful):
status: Triaged → Won't Fix
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