Format string error in Palo Alto PAN-OS on PA-7000 Series

1) Format string error

EUVDB-ID: #VU26742

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-1992

CWE-ID: CWE-134 - Use of Externally-Controlled Format String

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a format string error in the Varrcvr daemon of PAN-OS on PA-7000 Series devices with a Log Forwarding Card (LFC). A remote attacker can supply a specially crafted input that contains format string specifiers and cause a denial of service (DoS) condition or execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Palo Alto PAN-OS: 9.0.0 - 9.1.1

CPE2.3

• cpe:2.3:o:palo_alto_networks:pan-os:9.0.6:*:*:*:*:*:*:*
• cpe:2.3:o:palo_alto_networks:pan-os:9.1.1:*:*:*:*:*:*:*

External links

https://security.paloaltonetworks.com/CVE-2020-1992

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.