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amazonAmazonALAS-2019-1149
HistoryJan 25, 2019 - 2:26 a.m.

Important: kernel

2019-01-2502:26:00
alas.aws.amazon.com
74

8 High

CVSS3

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.7 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

COMPLETE

AV:A/AC:L/Au:S/C:P/I:P/A:C

0.001 Low

EPSS

Percentile

27.1%

JSON

Issue Overview:

A flaw was found in the Linux kernel’s NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2018-16884)

Affected Packages:

kernel

Issue Correction:
Run yum update kernel to update your system.

New Packages:

i686:  
    perf-debuginfo-4.14.94-73.73.amzn1.i686  
    kernel-tools-debuginfo-4.14.94-73.73.amzn1.i686  
    kernel-tools-devel-4.14.94-73.73.amzn1.i686  
    perf-4.14.94-73.73.amzn1.i686  
    kernel-debuginfo-common-i686-4.14.94-73.73.amzn1.i686  
    kernel-devel-4.14.94-73.73.amzn1.i686  
    kernel-tools-4.14.94-73.73.amzn1.i686  
    kernel-4.14.94-73.73.amzn1.i686  
    kernel-debuginfo-4.14.94-73.73.amzn1.i686  
    kernel-headers-4.14.94-73.73.amzn1.i686  
  
src:  
    kernel-4.14.94-73.73.amzn1.src  
  
x86_64:  
    kernel-tools-4.14.94-73.73.amzn1.x86_64  
    perf-4.14.94-73.73.amzn1.x86_64  
    perf-debuginfo-4.14.94-73.73.amzn1.x86_64  
    kernel-headers-4.14.94-73.73.amzn1.x86_64  
    kernel-4.14.94-73.73.amzn1.x86_64  
    kernel-tools-debuginfo-4.14.94-73.73.amzn1.x86_64  
    kernel-devel-4.14.94-73.73.amzn1.x86_64  
    kernel-debuginfo-4.14.94-73.73.amzn1.x86_64  
    kernel-tools-devel-4.14.94-73.73.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-4.14.94-73.73.amzn1.x86_64

Additional References

Red Hat: CVE-2018-16884

Mitre: CVE-2018-16884

OSVersionArchitecturePackageVersionFilename
Amazon Linux1i686perf-debuginfo< 4.14.94-73.73.amzn1perf-debuginfo-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-tools-debuginfo< 4.14.94-73.73.amzn1kernel-tools-debuginfo-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-tools-devel< 4.14.94-73.73.amzn1kernel-tools-devel-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686perf< 4.14.94-73.73.amzn1perf-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-debuginfo-common-i686< 4.14.94-73.73.amzn1kernel-debuginfo-common-i686-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-devel< 4.14.94-73.73.amzn1kernel-devel-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-tools< 4.14.94-73.73.amzn1kernel-tools-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel< 4.14.94-73.73.amzn1kernel-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-debuginfo< 4.14.94-73.73.amzn1kernel-debuginfo-4.14.94-73.73.amzn1.i686.rpm
Amazon Linux1i686kernel-headers< 4.14.94-73.73.amzn1kernel-headers-4.14.94-73.73.amzn1.i686.rpm
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8 High

CVSS3

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.7 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

COMPLETE

AV:A/AC:L/Au:S/C:P/I:P/A:C

0.001 Low

EPSS

Percentile

27.1%

JSON
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