CVE-2019-5892 : bgpd in FRRouting FRR (aka Free Range Routing) 2.x and 3.x before 3.0.4, 4.x bef

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.

Published 2019-01-10 17:29:00

Updated 2020-08-24 17:37:01

Source MITRE

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2019-5892

Frrouting » Frrouting
Versions from including (>=) 6.0 and before (<) 6.0.2
cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*
Matching versions
Frrouting » Frrouting
Versions from including (>=) 2.0 and up to, including, (<=) 2.0.2
cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*
Matching versions
Frrouting » Frrouting
Versions from including (>=) 3.0 and before (<) 3.0.4
cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*
Matching versions
Frrouting » Frrouting
Versions from including (>=) 5.0 and before (<) 5.0.2
cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*
Matching versions
Frrouting » Frrouting » Version: 4.0
cpe:2.3:a:frrouting:frrouting:4.0:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2019-5892

EPSS FAQ

0.50%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 76 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-5892

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:P	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
6.5	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-5892

CWE-436 Interpretation Conflict

Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-5892

https://github.com/FRRouting/frr/commit/943d595a018e69b550db08cccba1d0778a86705a

bgpd: don't use BGP_ATTR_VNC(255) unless ENABLE_BGP_VNC_ATTR is defined · FRRouting/frr@943d595 · GitHub
Patch;Third Party Advisory
https://github.com/FRRouting/frr/releases/tag/frr-5.0.2

Release FRR 5.0.2 Release · FRRouting/frr · GitHub
Release Notes;Third Party Advisory
https://github.com/FRRouting/frr/releases/tag/frr-6.0.2

Release FRR 6.0.2 Release · FRRouting/frr · GitHub
Release Notes;Third Party Advisory
https://lists.frrouting.org/pipermail/frog/2019-January/000404.html

[FROG] New Releases of FRR
Patch;Vendor Advisory
https://github.com/FRRouting/frr/releases/tag/frr-4.0.1

Release FRR 4.0.1 · FRRouting/frr · GitHub
Release Notes;Third Party Advisory
https://github.com/FRRouting/frr/releases/tag/frr-3.0.4

Release FRR 3.0.4 Release · FRRouting/frr · GitHub
Release Notes;Third Party Advisory
https://frrouting.org/community/security/cve-2019-5892.html

FRRouting
Vendor Advisory

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Vulnerability Details : CVE-2019-5892

Products affected by CVE-2019-5892

Exploit prediction scoring system (EPSS) score for CVE-2019-5892

CVSS scores for CVE-2019-5892

CWE ids for CVE-2019-5892

References for CVE-2019-5892