Security Advisory

CVE-2022-1388

About

On F5 BIG-IP 16.1.x versions prior to 16.1.2.2, 15.1.x versions prior to 15.1.5.1, 14.1.x versions prior to 14.1.4.6, 13.1.x versions prior to 13.1.5, and all 12.1.x and 11.6.x versions, undisclosed requests may bypass iControl REST authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

Weakness (CWE):CWE-306

Rainforest analyst review

F5 BIG-IP's iControl REST management API can be reached without valid credentials because of a flaw in how requests are authenticated: by manipulating connection headers and the `X-F5-Auth-Token` handling, an attacker convinces the system that a request arrived over a trusted local channel. That bypass grants access to authenticated REST endpoints, several of which run system commands, so an unauthenticated attacker with network access to the management interface achieves root command execution on the appliance.

BIG-IP sits directly in the traffic path as a load balancer, application firewall, and VPN/access gateway, terminating TLS and holding the keys and session material for the applications behind it. A pre-auth root RCE there is a full compromise of the enforcement point protecting everything downstream, which is why mass scanning and exploitation began within days of disclosure. The immediate mitigations F5 published — restricting iControl REST to trusted addresses and removing management-interface exposure — matter as much as the patch, because the management plane should never be internet-reachable. Given how fast this was weaponized, hunt for signs of prior exploitation rather than assuming patching alone closed the window.

References

Frequently asked questions

What is CVE-2022-1388?

How severe is CVE-2022-1388?

CVE-2022-1388 carries a CVSS 3.1 base score of 9.8, rated critical. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 99 out of 100, in the critical band.

How is CVE-2022-1388 exploited?

According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required None, user interaction None. Impact on confidentiality High, integrity High and availability High.

Which products are affected by CVE-2022-1388?

Public advisories list the following as affected: big-ip access policy manager, big-ip advanced firewall manager, big-ip analytics, big-ip application acceleration manager, big-ip application security manager, big-ip domain name system, +5. Check the references on this page for the exact versions each vendor confirms.

How do I fix CVE-2022-1388?

Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.

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