Information disclosure in Palo Alto PAN-OS - CVE-2021-3031
Published: January 13, 2021 / Updated: January 13, 2021
Vulnerability identifier: #VU49514
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-3031
CWE-ID: CWE-200
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output during Ethernet data frame construction. Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, 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.
Affected software
Palo Alto PAN-OS
How to mitigate CVE-2021-3031
Install updates from vendor's website.
Palo Alto PAN-OS - addressed in versions 8.1.18, 9.0.12, 9.1.5