CVE-2019-5597 Security feature bypass in FreeBSD

Critical 9.1 Published 15 May 2019 Updated 4 Aug 2024

Malicious IPv6 packets can bypass packet filtering or crash the system due to a bug in FreeBSD's fragment reassembly logic.

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-2019-5597?

CVE-2019-5597 is a critical vulnerability in Freebsd Freebsd, published on 15 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In FreeBSD 11.3-PRERELEASE and 12.0-STABLE before r347591, 11.2-RELEASE before 11.2-RELEASE-p10, and 12.0-RELEASE before 12.0-RELEASE-p4, a bug in the pf IPv6 fragment reassembly logic incorrectly uses the last extension header offset from the last received packet instead of the first packet allowing maliciously crafted IPv6 packets to cause a crash or potentially bypass the packet filter.

Weakness: CWE-20

Which versions are affected by CVE-2019-5597?

It affects 1 product.

Products include Freebsd Freebsd.

How do I fix CVE-2019-5597?

No fix has been published for CVE-2019-5597 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-5597 being exploited?

There is no known exploitation of CVE-2019-5597 in the wild and no public exploit code.

All Freebsd Freebsd vulnerabilities

Sources

Also known as GHSA-f2x6-v2r6-g94v.