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HistoryAug 13, 2022 - 3:18 p.m.

Security Bulletin: Vulnerability in polkit affects Cloud Pak System ( CVE-2021-4034)

2022-08-1315:18:29
www.ibm.com
24

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

7.2 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

Summary

Polkit is used by IBM Cloud System OS. This security bulletin service applies to IBM Cloud System , IBM Cloud System Software and IBM Cloud System Software Suite.

Vulnerability Details

CVEID:CVE-2021-4034
**DESCRIPTION:**Polkit could allow a local authenticated attacker to gain elevated privileges on the system, caused by incorrect handling of the argument vectors in the pkexec utility. By crafting environment variables in a specific way, an attacker could exploit this vulnerability to execute commands with root privileges.
CVSS Base score: 7.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/218087 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
IBM Cloud Pak System 2.3.3.0, 2.3.3.1, 2.3.3.2, 2.3.3.3, 2.3.3.4
IBM Cloud Pak System 2.3.0.1, 2.3.1.1, 2.3.2.0

Remediation/Fixes

For unsupported version/release/platform IBM recommends upgrading to a fixed, supported version of the product.

For IBM Cloud Pak System v2.3.0.1, v2.3.1.1, v2.3.2.0, v2.3.3.0, v.2.3.3.1, v.2.3.3.2, v.2.3.3.3, v2.3.3.3 Interim Fix 1, v2.3.3.4

upgrade to IBM Cloud Pak System v2.3.3.5 at Fix Central

Information on upgrading : <http://www.ibm.com/support/docview.wss?uid=ibm10887959&gt;

Workarounds and Mitigations

Temporary mitigation for the reported CVE-2021-4034 remove the SUID-bit from pkexec as follows:

As “root” user execute the command

chmod 0755 /usr/bin/pkexec

CPENameOperatorVersion
ibm cloud pak system softwareeq2.3

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

7.2 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