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Security Bulletin

Security notifications affecting the IP Fabric solution published according to our Security Incident Response policy.

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SA-495: Decoding HTTP/2 Rapid Reset (CVE-2023-44487)

Severity Affected Versions Fix Version
High 6.2.0 or newer N/A

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

This affects particularly customers who have an internet-facing IP Fabric instance.


The issue lies in the configuration of http2 on the line listen 443 ssl http2; within the nginx configuration files. To resolve this problem, you can remove http2, restart nginx, and the issue will be resolved. Currently, upgrading IP Fabric will overwrite the nginx files, leading to the problem recurring.

  • Connect via SSH to IP Fabric VM and check which files contain http2:
    sudo grep "http2" /etc/nginx/sites-enabled/*

    The output should look like this:

    osadmin@ipfabric-632:~$ sudo grep "http2" /etc/nginx/sites-enabled/*
    /etc/nginx/sites-enabled/ipf-frontend:    listen 443 ssl http2;
    /etc/nginx/sites-enabled/ipf-nimpee-update: listen 8443 ssl http2;
  • Edit each file to remove the http2 string. You can either do this manually or use the following command:
    sudo sed -i 's/ http2//' /etc/nginx/sites-enabled/*

    You can verify that the http2 has been removed by running the grep command:

    osadmin@ipfabric-632:~$ sudo grep "443" /etc/nginx/sites-enabled/*
    /etc/nginx/sites-enabled/ipf-frontend:    listen 443 ssl;
    /etc/nginx/sites-enabled/ipf-nimpee-update: listen 8443 ssl;
  • Restart nginx:
    sudo systemctl restart nginx

NIM-9199: Privilege escalation via Admin portal

Severity Affected Versions Fix Version
High 5.0.2 or earlier 6.0.1

A read-only user can create an escalated privilege account by taking advantage of token validation.

Tokens issued in the web app are accepted without proper validation. Using that, users of any privilege level can call an API endpoint for creating a new admin user account using their token. Then it is possible to escalate their privilege by logging in to the new account.

NIM-9023: API Token privilege escalation

Severity Affected Versions Fix Version
High 5.0.0, 5.0.1 or 5.0.2 6.0.1

Users can create an API token with RBAC properties that the token is not authorized for.

An API token can be generated that allows unauthorized collection of network data or modification of IP Fabric system settings.