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AUSCERT External Security Bulletin Redistribution
ESB-2021.0235
CVE-2021-3031 PAN-OS: Information exposure in Ethernet data
frame construction (Etherleak)
20 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: PAN-OS
Publisher: Palo Alto
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3031 CVE-2003-0001
Reference: ASB-2015.0009
ESB-2021.0181
ESB-2017.0092
Original Bulletin:
https://securityadvisories.paloaltonetworks.com/CVE-2021-3031
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Palo Alto Networks Security Advisories / CVE-2021-3031
CVE-2021-3031 PAN-OS: Information exposure in Ethernet data frame construction
(Etherleak)
047910
Severity 4.3 . MEDIUM
Attack Vector ADJACENT_NETWORK
Attack Complexity LOW
Privileges Required NONE
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact LOW
Integrity Impact NONE
Availability Impact NONE
NVD JSON
Published 2021-01-13
Updated 2021-01-19
Reference PAN-124681
Discovered in production use
Description
Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-5000 Series,
PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and
PA-7000 Series firewalls are not cleared before the data frame is created. This
leaks a small amount of random information from the firewall memory into the
Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS
firewall is able to collect potentially sensitive information from these
packets.
This issue is also known as Etherleak and is detected by security scanners as
CVE-2003-0001.
This issue impacts:
PAN-OS 8.1 version earlier than PAN-OS 8.1.18;
PAN-OS 9.0 versions earlier than PAN-OS 9.0.12;
PAN-OS 9.1 versions earlier than PAN-OS 9.1.5;
All versions of PAN-OS 8.0 and PAN-OS 7.1.
Product Status
Versions Affected Unaffected
PAN-OS None 10.0.*
10.0
PAN-OS < 9.1.5 on PA-220, PA-800, PA-3000 Series, PA-3200 Series, >= 9.1.5
9.1 PA-5200 Series, PA-7000 Series
PAN-OS < 9.0.12 on PA-220, PA-800, PA-3000 Series, PA-3200 Series, >= 9.0.12
9.0 PA-5200 Series, PA-7000 Series
PAN-OS < 8.1.18 on PA-200, PA-220, PA-500, PA-5000 Series, PA-800,
8.1 PA-3000 Series, PA-3200 Series, PA-5200 Series, PA-7000 >= 8.1.18
Series
PAN-OS 8.0.* on PA-200, PA-220, PA-500, PA-5000 Series, PA-800,
8.0 PA-3000 Series, PA-3200 Series, PA-5200 Series, PA-7000
Series
PAN-OS 7.1.* on PA-200, PA-220, PA-500, PA-5000 Series, PA-800,
7.1 PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200
Series, PA-7000 Series
Severity: MEDIUM
CVSSv3.1 Base Score: 4.3 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Exploitation Status
Palo Alto Networks is not aware of any malicious exploitation of this issue.
Weakness Type
CWE-200 Information Exposure
Solution
This issue is fixed in PAN-OS 8.1.18, PAN-OS 9.0.12, PAN-OS 9.1.5, and all
later PAN-OS versions.
Workarounds and Mitigations
There is no workaround to prevent the information leak in the Ethernet packets;
however, restricting access to the networks mitigates the risk of this issue.
Acknowledgments
This issue was found by a customer of Palo Alto Networks during a security
review.
Timeline
2021-01-19 Update affected hardware series names for compatible PAN-OS
versions.
2021-01-14 Update affected hardware series names for compatible PAN-OS
versions.
2021-01-13 Initial publication
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