title: PAN-OS: Buffer overflow when Captive Portal or Multi-Factor Authentication (MFA) is enabled
description: A buffer overflow vulnerability in PAN-OS allows an unauthenticated attacker to disrupt system processes and potentially execute arbitrary code with root privileges by sending a malicious request to the Captive Portal or Multi-Factor Authentication interface. This issue impacts: All versions of PAN-OS 8.0; PAN-OS 8.1 versions earlier than PAN-OS 8.1.15; PAN-OS 9.0 versions earlier than PAN-OS 9.0.9; PAN-OS 9.1 versions earlier than PAN-OS 9.1.3.
problem types: CWE-120 Buffer Overflow
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
status: affected, version: 8.0.*
changes: [at: 9.0.9, status: unaffected], lessThan: 9.0.9, status: affected, version: 9.0, versionType: custom
changes: [at: 9.1.3, status: unaffected], lessThan: 9.1.3, status: affected, version: 9.1, versionType: custom
changes: [at: 8.1.15, status: unaffected], lessThan: 8.1.15, status: affected, version: 8.1, versionType: custom
lessThan: 10.0*, status: unaffected, version: 10.0.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
exploits: Palo Alto Networks is not aware of any malicious attempts to exploit this vulnerability.
solutions: This issue is fixed in PAN-OS 8.1.15, PAN-OS 9.0.9, PAN-OS 9.1.3, and all later PAN-OS versions.
All Prisma Access services are now upgraded to resolve this issue and are no longer vulnerable.
PAN-OS 7.1 and 8.0 are end-of-life and are no longer covered by our Product Security Assurance policies.
workarounds: Until PAN-OS software is upgraded to a fixed version, enabling signatures in content update version 8317 will block attacks against CVE-2020-2040.