Palo Alto Networks Security Advisories / CVE-2022-0018

CVE-2022-0018 GlobalProtect App: Information Exposure Vulnerability When Connecting to GlobalProtect Portal With Single Sign-On Enabled

047910
Severity 6.1 · MEDIUM
Attack Vector NETWORK
Scope CHANGED
Attack Complexity HIGH
Confidentiality Impact HIGH
Privileges Required NONE
Integrity Impact NONE
User Interaction REQUIRED
Availability Impact NONE

Description

An information exposure vulnerability exists in the Palo Alto Networks GlobalProtect app on Windows and MacOS where the credentials of the local user account are sent to the GlobalProtect portal when the Single Sign-On feature is enabled in the GlobalProtect portal configuration.

This product behavior is intentional and poses no security risk when connecting to trusted GlobalProtect portals configured to use the same Single Sign-On credentials both for the local user account as well as the GlobalProtect login. However when the credentials are different, the local account credentials are inadvertently sent to the GlobalProtect portal for authentication. A third party MITM type of attacker cannot see these credentials in transit.

This vulnerability is a concern where the GlobalProtect app is deployed on Bring-your-Own-Device (BYOD) type of clients with private local user accounts or GlobalProtect app is used to connect to different organizations.

Fixed versions of GlobalProtect app have an app setting to prevent the transmission of the user's local user credentials to the target GlobalProtect portal regardless of the portal configuration.

This issue impacts:

GlobalProtect app 5.1 versions earlier than GlobalProtect app 5.1.10 on Windows and MacOS;

GlobalProtect app 5.2 versions earlier than GlobalProtect app 5.2.9 on Windows and MacOS

This issue does not affect GlobalProtect app on other platforms.

Product Status

VersionsAffectedUnaffected
GlobalProtect App 5.3None5.3.*
GlobalProtect App 5.2< 5.2.9 on Windows and MacOS>= 5.2.9 on Windows and MacOS
GlobalProtect App 5.1< 5.1.10 on Windows and MacOS>= 5.1.10 on Windows and MacOS

Severity:MEDIUM

CVSSv3.1 Base Score:6.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N)

Exploitation Status

Palo Alto Networks is not aware of any malicious exploitation of this issue.

Weakness Type

CWE-201 Information Exposure Through Sent Data

Solution

This issue is fixed in GlobalProtect app 5.1.10 on Windows and MacOS, GlobalProtect app 5.2.9 on Windows and MacOS, and all later GlobalProtect app versions with the ‘force-disable-sso’ app setting.

Set ‘force-disable-sso’ to ‘yes’ to prevent unintended transmission of the local user credentials as described here:

https://docs.paloaltonetworks.com/globalprotect/10-1/globalprotect-admin/globalprotect-apps/deploy-app-settings-transparently/customizable-app-settings/app-behavior-options.html

Workarounds and Mitigations

There are no known workarounds for this issue.

Acknowledgments

Palo Alto Networks thanks Irina Belyaeva of Jet Infosystems for discovering and reporting this issue.

Timeline

Initial publication
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