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amazonAmazonALAS2-2019-1293
HistorySep 25, 2019 - 10:59 p.m.

Important: kernel

2019-09-2522:59:00
alas.aws.amazon.com
21

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

8.7 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.001 Low

EPSS

Percentile

30.0%

Issue Overview:

An out-of-bounds access issue was found in the way Linux kernel’s KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer ‘struct kvm_coalesced_mmio’ object, wherein write indices ‘ring->first’ and ‘ring->last’ value could be supplied by a host user-space process. An unprivileged host user or process with access to ‘/dev/kvm’ device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.(CVE-2019-14821)

A buffer overflow flaw was found in the way Linux kernel’s vhost functionality that translates virtqueue buffers to IOVs, logged the buffer descriptors during migration. A privileged guest user able to pass descriptors with invalid length to the host when migration is underway, could use this flaw to increase their privileges on the host.(CVE-2019-14835)

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 the instance to update your system.

New Packages:

aarch64:  
    kernel-4.14.146-119.123.amzn2.aarch64  
    kernel-headers-4.14.146-119.123.amzn2.aarch64  
    kernel-debuginfo-common-aarch64-4.14.146-119.123.amzn2.aarch64  
    perf-4.14.146-119.123.amzn2.aarch64  
    perf-debuginfo-4.14.146-119.123.amzn2.aarch64  
    python-perf-4.14.146-119.123.amzn2.aarch64  
    python-perf-debuginfo-4.14.146-119.123.amzn2.aarch64  
    kernel-tools-4.14.146-119.123.amzn2.aarch64  
    kernel-tools-devel-4.14.146-119.123.amzn2.aarch64  
    kernel-tools-debuginfo-4.14.146-119.123.amzn2.aarch64  
    kernel-devel-4.14.146-119.123.amzn2.aarch64  
    kernel-debuginfo-4.14.146-119.123.amzn2.aarch64  
  
i686:  
    kernel-headers-4.14.146-119.123.amzn2.i686  
  
src:  
    kernel-4.14.146-119.123.amzn2.src  
  
x86_64:  
    kernel-4.14.146-119.123.amzn2.x86_64  
    kernel-headers-4.14.146-119.123.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.146-119.123.amzn2.x86_64  
    perf-4.14.146-119.123.amzn2.x86_64  
    perf-debuginfo-4.14.146-119.123.amzn2.x86_64  
    python-perf-4.14.146-119.123.amzn2.x86_64  
    python-perf-debuginfo-4.14.146-119.123.amzn2.x86_64  
    kernel-tools-4.14.146-119.123.amzn2.x86_64  
    kernel-tools-devel-4.14.146-119.123.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.146-119.123.amzn2.x86_64  
    kernel-devel-4.14.146-119.123.amzn2.x86_64  
    kernel-debuginfo-4.14.146-119.123.amzn2.x86_64  

Additional References

Red Hat: CVE-2019-14821, CVE-2019-14835

Mitre: CVE-2019-14821, CVE-2019-14835

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

8.7 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.001 Low

EPSS

Percentile

30.0%