Vulnerability identifier: #VU58111

Vulnerability risk: Critical

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3056

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Palo Alto PAN-OS
Operating systems & Components / Operating system

Vendor: Palo Alto Networks, Inc.

Description

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

The vulnerability exists due to a boundary error in the PAN-OS GlobalProtect Clientless VPN during SAML authentication. A remote attacker can send specially crafted request to the system, trigger memory corruption and execute arbitrary code with root privileges.

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: 10.0.0, 9.1 - 9.1.8, 9.0 - 9.0.13, 8.1 - 8.1.19

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External links
http://security.paloaltonetworks.com/CVE-2021-3056

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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.