ESB-2021.2204 – [Appliance] Cortex XSOAR: Multiple vulnerabilities

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AUSCERT External Security Bulletin Redistribution

ESB-2021.2204
CVE-2021-3044 Cortex XSOAR: Unauthorized Usage of the REST API
23 June 2021

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AusCERT Security Bulletin Summary
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Product: Cortex XSOAR
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Denial of Service — Remote/Unauthenticated
Access Confidential Data — Remote/Unauthenticated
Unauthorised Access — Remote/Unauthenticated
Reduced Security — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3044

Original Bulletin:
https://securityadvisories.paloaltonetworks.com/CVE-2021-3044

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Palo Alto Networks Security Advisories / CVE-2021-3044

CVE-2021-3044 Cortex XSOAR: Unauthorized Usage of the REST API

047910
Severity 9.8 . CRITICAL
Attack Vector NETWORK
Attack Complexity LOW
Privileges Required NONE
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH
NVD JSON
Published 2021-06-22
Updated 2021-06-22
Reference
Discovered internally

Description

An improper authorization vulnerability in Palo Alto Networks Cortex XSOAR
enables a remote unauthenticated attacker with network access to the Cortex
XSOAR server to perform unauthorized actions through the REST API.

This issue impacts:

Cortex XSOAR 6.1.0 builds later than 1016923 and earlier than 1271064;

Cortex XSOAR 6.2.0 builds earlier than 1271065.

This issue does not impact Cortex XSOAR 5.5.0, Cortex XSOAR 6.0.0, Cortex XSOAR
6.0.1, or Cortex XSOAR 6.0.2 versions.

All Cortex XSOAR instances hosted by Palo Alto Networks are upgraded to resolve
this vulnerability. No additional action is required for these instances.

Product Status

Versions Affected Unaffected
Cortex XSOAR 6.2.0 = 1271065
Cortex XSOAR 6.1.0 >= 1016923 and = 1271064
Cortex XSOAR 6.0.2 None all
Cortex XSOAR 6.0.1 None all
Cortex XSOAR 6.0.0 None all
Cortex XSOAR 5.5.0 None all

Required Configuration for Exposure

This issue is applicable only to Cortex XSOAR configurations with active API
key integrations.

You can determine whether your configuration is impacted by selecting ‘Settings
> Integration > API Keys’ from the Cortex XSOAR web client.

Severity: CRITICAL

CVSSv3.1 Base Score: 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Exploitation Status

Palo Alto Networks is not aware of any malicious attempts to exploit this
vulnerability.

Weakness Type

CWE-285 Improper Authorization

Solution

This issue is fixed in Cortex XSOAR 6.1.0 build 1271064, Cortex XSOAR 6.2.0
build 1271065, and all later Cortex XSOAR versions.

Workarounds and Mitigations

You must revoke all active integration API keys to fully mitigate the impact of
this issue.

To revoke integration API keys from the Cortex XSOAR web client:

Settings > Integration > API Keys and then Revoke each API key.

You can create new API keys after you upgrade Cortex XSOAR to a fixed version.

Restricting network access to the Cortex XSOAR server to allow only trusted
users also reduces the impact of this issue.

Acknowledgments

This issue was found during internal security review.

Frequently Asked Questions

Q. Are there any indicators of compromise or breach related to this
vulnerability?

Cortex XSOAR Audit Trail will list all performed administrative actions.
The presence of unexpected actions, new integrations, or additional users
could indicate a breach. To view an audit trail, select Settings > Users
and Roles > Audit Trail from the web client.

NOTE: exploitation of this vulnerability can impact the integrity of audit
trails, which means you cannot use an audit trail to conclusively determine
that the Cortex XSOAR instance was not compromised.

Q. Is this issue a remote code execution (RCE) vulnerability?

This issue is not a remote code execution vulnerability. This issue enables
an unauthorized attacker to perform actions on behalf of an active Cortex
XSOAR integration, which includes running commands and automations in the
Cortex XSOAR War Room.

Q. Has this issue been exploited in the wild?

No evidence of active exploitation was identified at the time this advisory
was published.

Q. What logs should I examine for clues of a compromise?

You can examine the Cortex XSOR Audit Trails and the application server log
(/var/log/demisto/server.log) for clues that indicate a compromise.

Timeline

2021-06-22 Initial publication
Terms of usePrivacyProduct Security Assurance and Vulnerability Disclosure
Policy Report vulnerabilitiesManage subscriptions
(C) 2020 Palo Alto Networks, Inc. All rights reserved.

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
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NOTE: This is only the original release of the security bulletin. It may
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
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On call after hours for member emergencies only.
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