Palo Alto Networks PAN-OS HTTP Header Handling URL Filter Bypass (PAN-SA-2016-0006)
Medium Nessus Plugin ID 90775
SynopsisThe remote host is affected by a security bypass vulnerability.
DescriptionThe Palo Alto Networks PAN-OS running on the remote host is version 5.0.x, 6.0.x, 6.1.x, 7.0.x, or 7.1.x prior to 7.1.1. It is, therefore, affected by a security bypass vulnerability in the URL filtering mechanism, which is triggered when handling a specially crafted HTTP header. An attacker can exploit this, via a specially crafted header, to evade URL filtering, potentially allowing a violation of the intended firewall rule base.
SolutionUpgrade to Palo Alto Networks PAN-OS version 7.1.1 or later, which includes additional inspection for HTTP application identification and URL categorization. Enforcement of this verification is enabled using new threat signatures #14984 for HTTP and #14978 for TLS. Note that PAN-OS must be upgraded to 7.1.1 in order for these new threat signatures to be enabled.