Juniper Junos ALG Fragmented Traffic Handling MS-MPC / MS-MIC Service PIC DoS (JSA10794)

medium Nessus Plugin ID 102707
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Synopsis

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

Description

According to its self-reported version and model number, the remote Juniper Junos device is affected by a denial of service vulnerability in the Application Layer Gateway (ALG) that is triggered when handling a large amount of fragmented packets. An unauthenticated, remote attacker can exploit this to crash an MS-MPC or MS-MIC service physical interface card (PIC).

Note that the device is only vulnerable if NAT or stateful-firewall rules are configured with ALGs enabled

Solution

Upgrade to the relevant Junos software release referenced in Juniper security advisory JSA10794. Alternatively, disable NAT and the stateful-firewall if they are not required.

See Also

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10794

Plugin Details

Severity: Medium

ID: 102707

File Name: juniper_jsa10794.nasl

Version: 1.4

Type: combined

Published: 8/23/2017

Updated: 7/13/2018

Dependencies: junos_version.nasl

Configuration: Enable paranoid mode

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: cpe:/o:juniper:junos

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/12/2017

Vulnerability Publication Date: 7/12/2017

Reference Information

CVE: CVE-2017-2346

JSA: JSA10794