Detections
Analytics

Juniper Junos MX Series PFE Small Packet DoS (JSA11036)

high Nessus Plugin ID 138908

Language:

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, the remote Juniper Junos OS device is affected by a denial of service (DoS) vulnerability. When a device running Juniper Networks Junos OS with MPC7, MPC8, or MPC9 line cards installed and the system is configured for inline IP reassembly, used by L2TP, MAP-E, GRE, and IPIP, the packet forwarding engine (PFE) will become disabled upon receipt of small fragments requiring reassembly. By continuously sending fragmented packets that cannot be reassembled, an attacker can repeatedly disable the PFE causing a sustained DoS.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the relevant Junos software release referenced in Juniper advisory JSA11036

See Also

https://kb.juniper.net/JSA11036

Plugin Details

Severity: High

ID: 138908

File Name: juniper_jsa11036.nasl

Version: 1.10

Type: combined

Published: 7/24/2020

Updated: 6/3/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2020-1649

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:juniper:junos

Required KB Items: Host/Juniper/model, Host/Juniper/JUNOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 7/8/2020

Vulnerability Publication Date: 7/8/2020

Reference Information

CVE: CVE-2020-1649

IAVA: 2020-A-0320-S

JSA: JSA11036