CVE-2019-5892

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 3.81% Top 15%
Vendor Advisory frrouting.org Vendor Advisory frrouting.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/FRRouting/frr/releases/tag/frr-3.0.4 third party advisory release notes
https://lists.frrouting.org/pipermail/frog/2019-January/000404.html patch vendor advisory
https://github.com/FRRouting/frr/releases/tag/frr-5.0.2 third party advisory release notes
https://github.com/FRRouting/frr/releases/tag/frr-6.0.2 third party advisory release notes
https://github.com/FRRouting/frr/commit/943d595a018e69b550db08cccba1d0778a86705a third party advisory patch
https://frrouting.org/community/security/cve-2019-5892.html vendor advisory
https://github.com/FRRouting/frr/releases/tag/frr-4.0.1 third party advisory release notes

Frequently Asked Questions

What is the severity of CVE-2019-5892?
CVE-2019-5892 has been scored as a medium severity vulnerability.
How to fix CVE-2019-5892?
To fix CVE-2019-5892, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-5892 being actively exploited in the wild?
It is possible that CVE-2019-5892 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~4% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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