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amazonAmazonALAS2-2018-1050
HistoryAug 04, 2018 - 11:49 p.m.

Critical: kernel

2018-08-0423:49:00
alas.aws.amazon.com
25

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.7

Confidence

High

EPSS

0.783

Percentile

98.3%

Issue Overview:

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. An attacker can induce a denial of service condition by sending specially modified packets within ongoing TCP sessions. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port. Thus, the attacks cannot be performed using spoofed IP addresses. (https://www.kb.cert.org/vuls/id/962459)

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:

src:  
    kernel-4.14.59-68.43.amzn2.src  
  
x86_64:  
    kernel-4.14.59-68.43.amzn2.x86_64  
    kernel-headers-4.14.59-68.43.amzn2.x86_64  
    kernel-debuginfo-common-x86_64-4.14.59-68.43.amzn2.x86_64  
    perf-4.14.59-68.43.amzn2.x86_64  
    perf-debuginfo-4.14.59-68.43.amzn2.x86_64  
    python-perf-4.14.59-68.43.amzn2.x86_64  
    python-perf-debuginfo-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-devel-4.14.59-68.43.amzn2.x86_64  
    kernel-tools-debuginfo-4.14.59-68.43.amzn2.x86_64  
    kernel-devel-4.14.59-68.43.amzn2.x86_64  
    kernel-debuginfo-4.14.59-68.43.amzn2.x86_64  

Additional References

Red Hat: CVE-2018-5390

Mitre: CVE-2018-5390

CVSS2

7.8

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.7

Confidence

High

EPSS

0.783

Percentile

98.3%