CVE-2019-5892 Denial of service in n/a

Medium 6.5 Published 10 Jan 2019 Updated 4 Aug 2024

Remote attackers can cause BGP session flaps and denial of service in FRRouting when VNC is enabled, due to improper handling of specific BGP attributes.

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

What is CVE-2019-5892?

CVE-2019-5892 is a medium-severity denial of service vulnerability in n/a, published on 10 Jan 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

bgpd in FRRouting FRR (aka Free Range Routing) 2.x and 3.x before 3.0.4, 4.x before 4.0.1, 5.x before 5.0.2, and 6.x before 6.0.2 (not affecting Cumulus Linux or VyOS), when ENABLE_BGP_VNC is used for Virtual Network Control, allows remote attackers to cause a denial of service (peering session flap) via attribute 255 in a BGP UPDATE packet. This occurred during Disco in January 2019 because FRR does not implement RFC 7606, and therefore the packets with 255 were considered invalid VNC data and the BGP session was closed.

Weakness: CWE-436

Which versions are affected by CVE-2019-5892?

It affects 1 product.

Products include Frrouting Frrouting.

How do I fix CVE-2019-5892?

No fix has been published for CVE-2019-5892 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-2019-5892 being exploited?

There is no known exploitation of CVE-2019-5892 in the wild and no public exploit code.

Sources

Also known as GHSA-546m-4w73-87m7.