CVE-2018-5502 Denial of service in BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, GTM, Link Controller, PEM, WebAccelerator, WebSafe)

High 7.5 Published 22 Mar 2018 Updated 17 Sep 2024

Attackers can disrupt services on F5 BIG-IP systems by sending maliciously crafted client certificates when client certificate authentication is enabled.

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-2018-5502?

CVE-2018-5502 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 22 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On F5 BIG-IP versions 13.0.0 - 13.1.0.3, attackers may be able to disrupt services on the BIG-IP system with maliciously crafted client certificate. This vulnerability affects virtual servers associated with Client SSL profile which enables the use of client certificate authentication. Client certificate authentication is not enabled by default in Client SSL profile. There is no control plane exposure.

Weakness: CWE-295

Which versions are affected by CVE-2018-5502?

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 Application Security Manager, F5 Big-Ip Domain Name System and 7 more.

How do I fix CVE-2018-5502?

No fix has been published for CVE-2018-5502 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-2018-5502 being exploited?

There is no known exploitation of CVE-2018-5502 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-4m7m-7666-wr24.