CVE-2020-2050

Summary

An authentication bypass vulnerability exists in the GlobalProtect SSL VPN component of Palo Alto Networks PAN-OS software that allows an attacker to bypass all client certificate checks with an invalid certificate. A remote attacker can successfully authenticate as any user and gain access to restricted VPN network resources when the gateway or portal is configured to rely entirely on certificate-based authentication. Impacted features that use SSL VPN with client certificate verification are: GlobalProtect Gateway, GlobalProtect Portal, GlobalProtect Clientless VPN In configurations where client certificate verification is used in conjunction with other authentication methods, the protections added by the certificate check are ignored as a result of this issue. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.17; PAN-OS 9.0 versions earlier than PAN-OS 9.0.11; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5; PAN-OS 10.0 versions earlier than PAN-OS 10.0.1.

Affected Software

VendorProductVersion RangeStatus
Palo Alto NetworksPAN-OS8.1 < 8.1.17affected
Palo Alto NetworksPAN-OS9.0 < 9.0.11affected
Palo Alto NetworksPAN-OS9.1 < 9.1.5affected
Palo Alto NetworksPAN-OS10.0 < 10.0.1affected

Weaknesses

  • CWE-285: CWE-285 Improper Authorization

Workarounds

This issue can be mitigated by configuring GlobalProtect SSL VPN to require gateway and portal users to authenticate with their credentials. Other authentication methods are not impacted by this issue.

ADP Enrichment

CVE Program Container

Additional References

References