CVE-2021-3055

Summary

An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.10; PAN-OS 10.0 versions earlier than PAN-OS 10.0.6. This issue does not affect Prisma Access.

Affected Software

VendorProductVersion RangeStatus
Palo Alto NetworksPAN-OS10.1.*unaffected
Palo Alto NetworksPAN-OS9.0 < 9.0.14affected
Palo Alto NetworksPAN-OS9.1 < 9.1.10affected
Palo Alto NetworksPAN-OS10.0 < 10.0.6affected
Palo Alto NetworksPAN-OS8.1 < 8.1.20affected

Weaknesses

  • CWE-611: CWE-611 Improper Restriction of XML External Entity Reference ('XXE')

Workarounds

This issue requires the attacker to have authenticated access to the PAN-OS web interface. You can mitigate the impact of this issue by following best practices for securing the PAN-OS web interface. Please review the Best Practices for Securing Administrative Access in the PAN-OS technical documentation at https://docs.paloaltonetworks.com/best-practices.

ADP Enrichment

CVE Program Container

Additional References

References