PAN-OS: Firewall Denial-of-Service (DoS) in the Web-Proxy Feature via a Burst of Maliciously Crafted Packets
A missing exception check in Palo Alto Networks PAN-OS® software with the web proxy feature enabled allows an unauthenticated attacker to send a burst of maliciously crafted packets that causes the firewall to become unresponsive and eventually reboot. Repeated successful attempts to trigger this condition will cause the firewall to enter maintenance mode.
This issue does not affect Cloud NGFW or Prisma Access.
Version
Minor Version
Suggested Solution
PAN-OS 11.2
11.2.0 through 11.2.4Upgrade to 11.2.5 or later.
PAN-OS 11.111.1.0 through 11.1.7
Upgrade to 11.1.7-h2 or 11.1.8 or later. 11.1.0 through 11.1.6Upgrade to 11.1.6-h1 or 11.1.8 or later.PAN-OS 11.0 (EoL)
Upgrade to a supported fixed version.
PAN-OS 10.2
No action needed.PAN-OS 10.1
No action needed.All other
unsupported
PAN-OS versions Upgrade to a supported fixed version.
Configurations
This issue only affects PAN-OS firewalls that have the web proxy feature enabled. This feature is only available on PAN-OS 11.0 and above. Additionally a license is required to use the web proxy feature.
To verify if you have configured web proxy on your PAN-OS device, see our documentation regarding the web proxy feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-new-features/networking-features/web-proxyhttps:// .
Workarounds
If you are not using the web proxy feature, you can disable it to mitigate this issue. For more information regarding the web proxy feature, see our documentation regarding the web proxy feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-new-features/networking-features/web-proxyhttps:// .
Exploits
Palo Alto Networks is not aware of any malicious exploitation of this issue.