CVE-2023-4481 2023-08-29 Out-of-Cycle Security Bulletin: Junos OS and Junos OS Evolved: A crafted BGP UPDATE message allows a remote attacker to de-peer (reset) BGP sessions (CVE-2023-4481)

2023-08-3123:46:18

CWE-20

juniper

www.cve.org

out-of-cycle security

improper input validation

bgp update

denial of service

remote attacker

ipv4

ipv6

bgp session

7.5 High

CVSS3

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

0.001 Low

EPSS

Percentile

45.4%

JSON

An Improper Input Validation vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).

When certain specific crafted BGP UPDATE messages are received over an established BGP session, one BGP session may be torn down with an UPDATE message error, or the issue may propagate beyond the local system which will remain non-impacted, but may affect one or more remote systems. This issue is exploitable remotely as the crafted UPDATE message can propagate through unaffected systems and intermediate BGP speakers.
Continuous receipt of the crafted BGP UPDATE messages will create a sustained Denial of Service (DoS) condition for impacted devices.

This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session.

CNA Affected

[
  {
    "defaultStatus": "affected",
    "modules": [
      "BGP",
      "rpd"
    ],
    "product": "Junos OS",
    "vendor": "Juniper Networks, Inc.",
    "versions": [
      {
        "lessThan": "23.4R1",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  },
  {
    "defaultStatus": "affected",
    "modules": [
      "BGP",
      "rpd"
    ],
    "product": "Junos OS Evolved",
    "vendor": "Juniper Networks, Inc.",
    "versions": [
      {
        "lessThan": "23.4R1-EVO",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]