Lucene search

K
amazonAmazonALAS2-2021-1623
HistoryMar 25, 2021 - 6:31 p.m.

Important: screen

2021-03-2518:31:00
alas.aws.amazon.com
33

7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.8 High

AI Score

Confidence

High

0.015 Low

EPSS

Percentile

86.7%

Issue Overview:

A flaw was found in screen. A specially crafted sequence of combining characters could cause an out of bounds write leading to arbitrary code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2021-26937)

Affected Packages:

screen

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 screen to update your system.

New Packages:

aarch64:  
    screen-4.1.0-0.27.20120314git3c2946.amzn2.aarch64  
    screen-debuginfo-4.1.0-0.27.20120314git3c2946.amzn2.aarch64  
  
i686:  
    screen-4.1.0-0.27.20120314git3c2946.amzn2.i686  
    screen-debuginfo-4.1.0-0.27.20120314git3c2946.amzn2.i686  
  
src:  
    screen-4.1.0-0.27.20120314git3c2946.amzn2.src  
  
x86_64:  
    screen-4.1.0-0.27.20120314git3c2946.amzn2.x86_64  
    screen-debuginfo-4.1.0-0.27.20120314git3c2946.amzn2.x86_64  

Additional References

Red Hat: CVE-2021-26937

Mitre: CVE-2021-26937

7.5 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.8 High

AI Score

Confidence

High

0.015 Low

EPSS

Percentile

86.7%