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amazonAmazonALAS2-2018-1104
HistoryNov 07, 2018 - 10:11 p.m.

Medium: mod_http2

2018-11-0722:11:00
alas.aws.amazon.com
16

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

6.1 Medium

AI Score

Confidence

High

0.007 Low

EPSS

Percentile

79.7%

JSON

Issue Overview:

In Apache HTTP Server, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.(CVE-2018-11763)

Affected Packages:

mod_http2

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 mod_http2 to update your system.

New Packages:

i686:  
    mod_http2-1.11.1-1.amzn2.i686  
    mod_http2-debuginfo-1.11.1-1.amzn2.i686  
  
src:  
    mod_http2-1.11.1-1.amzn2.src  
  
x86_64:  
    mod_http2-1.11.1-1.amzn2.x86_64  
    mod_http2-debuginfo-1.11.1-1.amzn2.x86_64

Additional References

Red Hat: CVE-2018-11763

Mitre: CVE-2018-11763

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4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

6.1 Medium

AI Score

Confidence

High

0.007 Low

EPSS

Percentile

79.7%

JSON
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