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amazonAmazonALAS2-2022-1745
HistoryJan 27, 2022 - 12:38 a.m.

Important: polkit

2022-01-2700:38:00
alas.aws.amazon.com
23

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

8.8 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

LOCAL

Access 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

Issue Overview:

A local privilege escalation vulnerability was found on polkit’s pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn’t handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it’ll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine. (CVE-2021-4034)

Affected Packages:

polkit

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 polkit to update your system.

New Packages:

aarch64:  
    polkit-0.112-26.amzn2.1.aarch64  
    polkit-devel-0.112-26.amzn2.1.aarch64  
    polkit-debuginfo-0.112-26.amzn2.1.aarch64  
  
i686:  
    polkit-0.112-26.amzn2.1.i686  
    polkit-devel-0.112-26.amzn2.1.i686  
    polkit-debuginfo-0.112-26.amzn2.1.i686  
  
noarch:  
    polkit-docs-0.112-26.amzn2.1.noarch  
  
src:  
    polkit-0.112-26.amzn2.1.src  
  
x86_64:  
    polkit-0.112-26.amzn2.1.x86_64  
    polkit-devel-0.112-26.amzn2.1.x86_64  
    polkit-debuginfo-0.112-26.amzn2.1.x86_64  

Additional References

Red Hat: CVE-2021-4034

Mitre: CVE-2021-4034

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

8.8 High

AI Score

Confidence

High

7.2 High

CVSS2

Access Vector

LOCAL

Access 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