Palo Alto Networks Security Advisories / CVE-2020-1992

CVE-2020-1992 PAN-OS on PA-7000 Series: Varrcvr daemon network-based denial of service or privilege escalation

047910
Severity 8.1 · HIGH
Attack Vector NETWORK
Attack Complexity HIGH
Privileges Required NONE
User Interaction NONE
Scope UNCHANGED
Confidentiality Impact HIGH
Integrity Impact HIGH
Availability Impact HIGH

Description

A format string vulnerability in the Varrcvr daemon of PAN-OS on PA-7000 Series devices with a Log Forwarding Card (LFC) allows remote attackers to crash the daemon creating a denial of service condition or potentially execute code with root privileges.

This issue affects Palo Alto Networks PAN-OS 9.0 versions before 9.0.7; PAN-OS 9.1 versions before 9.1.2 on PA-7000 Series devices with an LFC installed and configured.

This issue requires WildFire services to be configured and enabled.

This issue does not affect PAN-OS 8.1 and earlier releases.

This issue does not affect any other PA Series firewalls.

Product Status

PAN-OS

VersionsAffectedUnaffected
9.1< 9.1.2 on PA-7000 series with LFC>= 9.1.2 on PA-7000 series with LFC
9.0< 9.0.7 on PA-7000 series with LFC>= 9.0.7 on PA-7000 series with LFC
8.18.1.*
8.08.0.*
7.17.1.*

Required Configuration for Exposure

This issue requires WildFire services to be configured and enabled.

Severity: HIGH

CVSSv3.1 Base Score: 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Weakness Type

CWE-134 Use of Externally-Controlled Format String

Solution

This issue is fixed in PAN-OS 9.0.7, PAN-OS 9.1.2 and all later versions.

Workarounds and Mitigations

There are no viable workarounds for this issue.

Acknowledgments

This issue was found by a customer.

Timeline

Initial publication
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