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CloudflareCVE-2021-3761

HistorySep 09, 2021 - 2:15 p.m.

CVE-2021-3761

2021-09-0914:15:09

CWE-787

cloudflare

web.nvd.nist.gov

cve-2021-3761

octorpki

rpki

vrp

rtr sessions

bgp hijack

as 13335

cloudflare

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

7.3

Confidence

High

EPSS

0.001

Percentile

45.4%

JSON

Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP “MaxLength” value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as “RPKI invalid”. Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.

Affected configurations

Nvd

Node

cloudflareoctorpkiRange<1.3.0

Node

debiandebian_linuxMatch11.0

VendorProductVersionCPE
cloudflareoctorpki*cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:*
debiandebian_linux11.0cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cloudflare	octorpki	*	cpe:2.3:a:cloudflare:octorpki::::::::
debian	debian_linux	11.0	cpe:2.3:o:debian:debian_linux:11.0:::::::*

CNA Affected

[
  {
    "product": "octorpki",
    "vendor": "Cloudflare",
    "versions": [
      {
        "lessThan": "1.3.0",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]