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amazonAmazonALAS2-2021-1633
HistoryApr 27, 2021 - 7:20 p.m.

Important: xorg-x11-server

2021-04-2719:20:00
alas.aws.amazon.com
9

7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

10.3%

JSON

Issue Overview:

A flaw was found in xorg-x11-server. An interger underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-3472)

Affected Packages:

xorg-x11-server

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 xorg-x11-server to update your system.

New Packages:

aarch64:  
    xorg-x11-server-common-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xorg-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xnest-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-devel-1.20.4-15.amzn2.0.2.aarch64  
    xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.2.aarch64  
  
i686:  
    xorg-x11-server-common-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xorg-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xnest-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-devel-1.20.4-15.amzn2.0.2.i686  
    xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.2.i686  
  
noarch:  
    xorg-x11-server-source-1.20.4-15.amzn2.0.2.noarch  
  
src:  
    xorg-x11-server-1.20.4-15.amzn2.0.2.src  
  
x86_64:  
    xorg-x11-server-common-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xorg-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xnest-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-devel-1.20.4-15.amzn2.0.2.x86_64  
    xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.2.x86_64

Additional References

Red Hat: CVE-2021-3472

Mitre: CVE-2021-3472

OSVersionArchitecturePackageVersionFilename
Amazon Linux2aarch64xorg-x11-server-common< 1.20.4-15.amzn2.0.2xorg-x11-server-common-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xorg< 1.20.4-15.amzn2.0.2xorg-x11-server-Xorg-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xnest< 1.20.4-15.amzn2.0.2xorg-x11-server-Xnest-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xdmx< 1.20.4-15.amzn2.0.2xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xvfb< 1.20.4-15.amzn2.0.2xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xephyr< 1.20.4-15.amzn2.0.2xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-xwayland< 1.20.4-15.amzn2.0.2xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-devel< 1.20.4-15.amzn2.0.2xorg-x11-server-devel-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2aarch64xorg-x11-server-debuginfo< 1.20.4-15.amzn2.0.2xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.2.aarch64.rpm
Amazon Linux2i686xorg-x11-server-common< 1.20.4-15.amzn2.0.2xorg-x11-server-common-1.20.4-15.amzn2.0.2.i686.rpm
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7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.5 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

10.3%

JSON
Related for ALAS2-2021-1633
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