CVE-2018-15317 Denial of service in BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, FPS, GTM, Link Controller, PEM, WebAccelerator)

High 7.5 Published 31 Oct 2018 Updated 5 Aug 2024

An attacker can cause a denial of service on F5 BIG-IP SSL Virtual Servers by sending crafted SSL records, requiring a tmm restart to recover.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-15317?

CVE-2018-15317 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 31 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In BIG-IP 14.0.0-14.0.0.2, 13.0.0-13.1.1.5, 12.1.0-12.1.4.1, and 11.2.1-11.6.3.2, an attacker sending specially crafted SSL records to a SSL Virtual Server will cause corruption in the SSL data structures leading to intermittent decrypt BAD_RECORD_MAC errors. Clients will be unable to access the application load balanced by a virtual server with an SSL profile until tmm is restarted.

Which versions are affected by CVE-2018-15317?

It affects 13 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Domain Name System, F5 Big-Ip Edge Gateway and 7 more.

How do I fix CVE-2018-15317?

No fix has been published for CVE-2018-15317 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-15317 being exploited?

There is no known exploitation of CVE-2018-15317 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-2xc5-4m2p-gqwv.