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
Red Hat: CVE-2021-4034
Mitre: CVE-2021-4034
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | polkit | < 0.112-26.amzn2.1 | polkit-0.112-26.amzn2.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | polkit-devel | < 0.112-26.amzn2.1 | polkit-devel-0.112-26.amzn2.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | polkit-debuginfo | < 0.112-26.amzn2.1 | polkit-debuginfo-0.112-26.amzn2.1.aarch64.rpm |
Amazon Linux | 2 | i686 | polkit | < 0.112-26.amzn2.1 | polkit-0.112-26.amzn2.1.i686.rpm |
Amazon Linux | 2 | i686 | polkit-devel | < 0.112-26.amzn2.1 | polkit-devel-0.112-26.amzn2.1.i686.rpm |
Amazon Linux | 2 | i686 | polkit-debuginfo | < 0.112-26.amzn2.1 | polkit-debuginfo-0.112-26.amzn2.1.i686.rpm |
Amazon Linux | 2 | noarch | polkit-docs | < 0.112-26.amzn2.1 | polkit-docs-0.112-26.amzn2.1.noarch.rpm |
Amazon Linux | 2 | x86_64 | polkit | < 0.112-26.amzn2.1 | polkit-0.112-26.amzn2.1.x86_64.rpm |
Amazon Linux | 2 | x86_64 | polkit-devel | < 0.112-26.amzn2.1 | polkit-devel-0.112-26.amzn2.1.x86_64.rpm |
Amazon Linux | 2 | x86_64 | polkit-debuginfo | < 0.112-26.amzn2.1 | polkit-debuginfo-0.112-26.amzn2.1.x86_64.rpm |
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