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amazonAmazonALAS2-2018-1100
HistoryNov 07, 2018 - 9:58 p.m.

Medium: kernel

2018-11-0721:58:00
alas.aws.amazon.com
26

4.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:C/I:N/A:N

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

28.2%

Issue Overview:

An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel. An attacker with a local account can trick the stack unwinder code to leak stack contents to userspace. The fix allows only root to inspect the kernel stack of an arbitrary task.(CVE-2018-17972)

A vulnerability was discovered in the Linux kernel that allows an attacker to escalate privileges with using a 64-bit ARM architecture. A local attacker with permission to create KVM-based virtual machines can both panic the hypervisor by triggering an illegal exception return (resulting in a DoS) and to redirect execution elsewhere within the hypervisor with full register control, instead of causing a return to the guest.(CVE-2018-18021)

Affected Packages:

kernel

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update kernel and reboot your instance to update your system.

New Packages:

i686:  
    kernel-headers-4.14.77-80.57.amzn2.i686  
  
src:  
    kernel-4.14.77-80.57.amzn2.src  
  
x86_64:  
    kernel-4.14.77-80.57.amzn2.x86_64  
    kernel-headers-4.14.77-80.57.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.77-80.57.amzn2.x86_64  
    perf-4.14.77-80.57.amzn2.x86_64  
    perf-debuginfo-4.14.77-80.57.amzn2.x86_64  
    python-perf-4.14.77-80.57.amzn2.x86_64  
    python-perf-debuginfo-4.14.77-80.57.amzn2.x86_64  
    kernel-tools-4.14.77-80.57.amzn2.x86_64  
    kernel-tools-devel-4.14.77-80.57.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.77-80.57.amzn2.x86_64  
    kernel-devel-4.14.77-80.57.amzn2.x86_64  
    kernel-debuginfo-4.14.77-80.57.amzn2.x86_64  

Additional References

Red Hat: CVE-2018-17972, CVE-2018-18021

Mitre: CVE-2018-17972, CVE-2018-18021

4.9 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:C/I:N/A:N

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

28.2%