QID 731307

Date Published: 2024-04-01

QID 731307: Palo Alto Networks (PAN-OS)Impact of Terrapin SSH Attack Vulnerability (PAN-241547, CGSDW-19542)

PAN OS is the software that runs all Palo Alto Networks next-generation firewalls.

The Terrapin attack allows an attacker with the ability to intercept SSH traffic on affected Palo Alto Networks products (through machine-in-the-middle or MitM attacks) to downgrade connection security and force the usage of less secure client authentication algorithms when an administrator or user connects to the product.

Affected Versions:
PAN-OS 11.1 versions earlier than PAN-OS 11.1.3
PAN-OS 11.0 versions earlier than PAN-OS 11.0.7
PAN-OS 10.2 versions earlier than PAN-OS 10.2.11


QID Detection Logic (Authenticated):

This QID looks for the vulnerable version of PAN-OS

NOTE:The SSH server in PAN-OS software configured with support for the CHACHA20-POLY1305 algorithm or any Encrypt-then-MAC algorithms (ciphers with -etm in the name) enables the Terrapin Attack and is impacted by this issue.

The Terrapin attack allows an attacker with the ability to intercept SSH traffic on affected Palo Alto Networks products (through machine-in-the-middle or MitM attacks) to downgrade connection security and force the usage of less secure client authentication algorithms when an administrator or user connects to the product.

  • CVSS V3 rated as Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution

    Refer to CVE-2023-48795 for more information about patching this vulnerability.



    Workaround:
    If using the SSH client provided with PAN-OS to connect from the firewall to an external SSH server, ensure that the SSH server does not support the CHACHA20-POLY1305 algorithm or any Encrypt-then-MAC algorithms.

    Vendor References

    CVEs related to QID 731307

    CVE-2023-48795 |
    Software Advisories
    Advisory ID Software Component Link
    CVE-2023-48795 URL Logo security.paloaltonetworks.com/CVE-2023-48795
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].